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Open Orthop J. 2013; 7: 562–581.
Published online Sep 20, 2013. doi:  10.2174/1874325001307010562
PMCID: PMC3806030
Suppl 4
Physician-Delivered Injection Therapies for Mechanical Neck Disorders: A Systematic Review Update (Non-Oral, Non-Intravenous Pharmacological Interventions for Neck Pain)
Anita R. Gross,*1 Paul M. Peloso,2 Erin Galway,1 Neenah Navasero,1 Karis Van Essen,1 Nadine Graham,1 Charlie H Goldsmith,3 Wisam Gzeer,1 Qiyun Shi,4 and Ted and COG Haines1 §
1McMaster University, Hamilton, Canada
2Merck, Kenilworth, NJ, USA
3Simon Fraser University, Burnaby, Canada
4Western University, London, Canada
*Address correspondence to this author at the McMaster University, School of Rehabilitation Science, IAHS, 1400 Main Street West, 4th Floor, Hamilton, ON, L8S 1C7, Canada; Tel: 905-577-0098; Fax: 905-577-0603; E-mail: grossa/at/mcmaster.ca
§COG, Cervical Overview Group is an international research group that conducts and maintains systematic reviews for neck pain.
Received April 25, 2013; Revised May 28, 2013; Accepted May 28, 2013.
Background:
Controversy persists regarding medicinal injections for mechanical neck disorders (MNDs).
Objectives:
To determine the effectiveness of physician-delivered injections on pain, function/disability, quality of life, global perceived effect and patient satisfaction for adults with MNDs.
Search Methods:
We updated our previous searches of CENTRAL, MEDLINE and EMBASE from December 2006 through to March 2012.
Selection Criteria:
We included randomized controlled trials of adults with neck disorders treated by physician-delivered injection therapies.
Data Collection and Analysis:
Two authors independently selected articles, abstracted data and assessed methodological quality. When clinical heterogeneity was absent, we combined studies using random-effects models.
Results:
We included 12 trials (667 participants). No high or moderate quality studies were found with evidence of benefit over control. Moderate quality evidence suggests little or no difference in pain or function/disability between nerve block injection of steroid and bupivacaine vs bupivacaine alone at short, intermediate and long-term for chronic neck pain. We found limited very low quality evidence of an effect on pain with intramuscular lidocaine vs control for chronic myofascial neck pain. Two low quality studies showed an effect on pain with anaesthetic nerve block vs saline immediately post treatment and in the short-term. All other studies were of low or very low quality with no evidence of benefit over controls.
Authors' Conclusions:
Current evidence does not confirm the effectiveness of IM-lidocaine injection for chronic mechanical neck pain nor anaesthetic nerve block for cervicogenic headache. There is moderate evidence of no benefit for steroid blocks vs controls for mechanical neck pain.
Keywords: Injections, neck, pain, systematic review, meta-analysis.
Neck disorders are common and can be disabling and costly [1, 2]. The prevalence of neck pain in the general population varies from 146 to 213 per 1000 people [2]. The prevalence of neck pain is higher in women and increases with age with a peak between 30 to 45 years [1, 3-5]. Subjects reporting neck pain in the previous year also reported recurrence in 93.7% [5]. Each year 0.6% of adults living in Saskatchewan, Canada reported developing disabling neck pain and 37.3% of patients report persistent pain [6]. Twenty-four to 50% of people have persistent symptoms 12 months after a motor vehicle accident [7, 8]. It appears that women and those with a depressed mood have a higher risk of developing persistent widespread pain following whiplash associated disorder (WAD) [9]. Neck pain accounts for approximately 11.3% of all Workplace Safety and Insurance Board lost time claims in Ontario [1]. In the United States total health care costs for neck pain were estimated to be $686 million in 1996 dollars [10]. Physician-delivered injections are often used to treat mechanical neck pain presenting with or without radicular symptoms. These can include several routes, including subcutaneous, intramuscular, intra-articiular, intera-thecal, etc. However evidence for the safest and most effective injections is lacking [11].
Description of the Condition
In this review we considered patients with mechanical neck disorders (MNDs) including neck related diagnoses of: sprains and strains, WAD, neck pain associated with work related injury, neck pain associated with myofascial pain, neck pain with associated degenerative changes, and headaches of cervicogenic origin. Mechanical neck disorders can be classified as specific or non-specific neck pain. Specific neck pain results from an identifiable pain generating mechanism such as the intervertebral disc, cervical facet joints, and nerve root dura. It may present with radicular pain, somatic pain including discogenic pain and facet joint pain. Non-specific neck pain has no identifiable aetiology although it should be aggravated by neck movements. There are many possible sources of non-specific neck pain including but not limited to intervertebral disc, cervical facet joints, atlanto-axial and atlanto-occipital joints, ligaments, fascia, muscles and nerve root dura. We classified the mechanical neck pain duration as acute if it was present for less than 30 days, subacute if it was present between 30 and 90 days or chronic if it was present for longer than 90 days.
Description of the Intervention and how it Might Work
Corticosteroids are thought to act to reduce inflammation by inhibiting phospholipase A and thereby the downstream synthesis of pro-inflammatory molecules. However a 2012 study suggests steroids may have more of an effect in reducing pain than inflammation [12].
Local anaesthetic agents produce a reversible loss of sensation in the injected muscle or joint by interrupting the conduction of impulses in peripheral nerves. In general, all effects are reversible with amide anaesthetic agents having a longer duration of effect as compared to ester anesthetic agents [13].
Some agents, such as dry needling and saline injections which are chemically neutral, are thought to exert their effects through mechanical means, by disruption of a local muscular spasm and not through specific local biochemical alternations. Subcutaneous agents such as CO2 may work through local mechanical disruption, although some have suggested that the acidosis induced may alter local blood flow. For some injected therapies, the exact mechanism of action has not been well-established. These injected agents are typically applied to the neck structures that are suspected of causing the pain, or to the referred areas of pain associated with the neck pain, such as myofascial trigger points. These injections are generally expected to exert their effects on the tissues locally.
Other agents that might be delivered via intramuscular or intravenous injection to treat neck pain, including opioids (e.g. morphine), non-steroidal anti-inflammatory medications (e.g. toradol), muscle relaxants (e.g. diazepam), etc. were excluded, since these agents are thought to work through achieving therapeutic systemic levels of the drug or central effects and these agents are not typically applied to the neck tissues directly with the intent of inducing local effects.
Why it is Important to do this Review
In our last review on medicinal and injection therapies Peloso 2007 (search end date 2006) [14], we found evidence from one trial that intramuscular injection of lidocaine (IM-lidocaine) was superior to placebo for chronic neck disorders at short-term follow-up. Another trial showed that IM-lidocaine was similar to ultrasound for chronic neck pain at short-term follow-up.
A 2011 systematic review on botolinum toxin (BoNT) for subacute/chronic neck pain was updated [15] (search end date 2010) and the conclusions were consistent with an International Collaboration on Neck (ICON) overview of systematic reviews on medicines and injections for neck pain [16] in suggesting that there is evidence against the use of BoNT-A for chronic neck pain or subacute/chronic whiplash. Further the ICON review of systematic reviews gave evidence against medial branch block with steroids for chronic facet joint pain, but for the use of eperison hydrochloride for chronic neck pain. In the Peloso 2012 [16] review of reviews it was noted that the search update for lidocaine and epidural ended in 2008 while the searches for steroids, nerve blocks and insufflation ended in 2006. During this 6 year gap additional trials have been published on medicinal injections for neck pain; therefore, an update literature search was warranted.
OBJECTIVES
Our systematic review assessed the treatment effectiveness of medical injections in acute, subacute and chronic MNDs. Outcomes of interest included pain, function/disability, quality of life, global perceived effect and patient satisfaction in different timeframes.
METHODS
Methods consistent with the series of Cervical Overview Group (COG) reviews were utilized here as well. This group publishes both Cochrane and other Systematic Reviews. As such the searches meet the standards recommended by the Cochrane Collaboration Back Group.
Types of Studies
We included all published randomized controlled trials (RCTs). We had no restrictions based on the methodological quality of RCTs.
Types of Participants
We included trials of adults ((18 years) with a spectrum of symptom duration (acute < 30 days, subacute 30 to 90 days, or chronic > 90 days) who had:
  • Neck pain without radicular findings, including non-specific (mechanical, simple) neck pain of unknown etiology or whiplash associated disorder (WAD) grade I to II.
  • Neck pain with associated myofascial pain syndrome and neck pain with associated degenerative changes.
  • Neck pain with cervicogenic headache.
  • Neck pain with radicular findings suggesting a nerve root impingement.
  • Neck pain with radicular findings, including degenera-tive joint or disc disease with spinal stenosis, spondylo-listhesis, discogenic radiculopathy, or WAD grade III.
We excluded studies of neck disorders with the following specific causes:
  • Definite or possible long tract signs (e.g. myelopathies).
  • Neck pain caused by other pathological entities.
  • Headache not of cervical origin but associated with the neck pain.
  • Co-existing headache when either neck pain was not dominant or the headache was not provoked by neck movements or sustained neck postures.
  • 'Mixed' headache, which includes more than one headache classification.
  • WAD grade IV.
The above inclusion and exclusion criteria are based on criteria used by the Cervical Overview Group (COG) in the systematic review on BoNT for subacute/chronic neck pain update [15].
Types of Interventions
We included studies using physician-delivered injections compared to placebo or control. A physician-delivered injection was defined as one administered by a physician to a muscle, joint or any part of the body through a syringe or a medical device. Although typically applied to the cervical region, the injections could also be applied to other body regions as long as the injection was given with the intent of treating the local effects of neck pain. For example patients with neck pain may have referred pain with myofascial trigger points, and these trigger points are often injected as well. Typical medications for injection were local anaesthetics, corticosteroids, and BoNT. However as we have recently updated the review on BoNT [15], it is not considered further in this review. Further, we did not consider therapies delivered by injection that are expected to work by achieving systemic levels of drug (like opioids, non-steroidals, muscle relaxants) since these agents are not typically delivered into the neck tissues or myofascial trigger points.
Interventions were contrasted against the following comparisons:
  • Physician-delivered injection vs sham or placebo (e.g. intra-muscular lidocaine vs dry needling);
  • Physician-delivered injection vs waitlist or no treatment;
  • Physician-delivered injection plus another intervention vs that same intervention (e.g. intra-muscular lidocaine + stretching vs stretching);
Types of Outcome Measures
We were interested in outcomes of pain, function/disability, quality of life, global perceived effect and patient satisfaction. Function and disability could be measured using either self-report measures or observer-based physical performance tests [17, 18]. Some examples of pain outcome measures are: the Visual Analogue Scale (VAS) and the Numeric Pain Rating Scale (NPRS). A representative example of a disability and function outcome measure is the patient completed Neck Disability Index (NDI). Due to their limited clinical agreement (and hence their uncertain utility as outcome measures), tests used during a standard physical examination, such as inspection, range of motion, strength, palpation, provocation, muscular stability, neurological tests, and cervical proprioception were excluded from this review. Data on adverse effects and cost of treatments were captured when they were reported. The duration of follow-up was defined as: immediately post treatment (within one day); short-term follow-up (closest to four weeks); intermediate-term follow-up (closest to six months); and long-term follow-up (closest to 12 months).
SEARCH METHODS FOR IDENTIFICATION OF STUDIES
Electronic Searches
A research librarian searched bibliographic databases, without language restrictions, in the medical, chiropractic, and allied health literature, through Cochrane Central Register of Controlled Trials (CENTRAL; The Cochrane Library 2012, issue 1) and MEDLINE, EMBASE from 2006 to March 2012; data from our previous Cochrane review [15] with a search from root to 2006 were also included in this review. See APPENDIX A for the search strategy for MEDLINE.
Searching Other Resources
We screened references and examined the review team's personal files as well as key conference proceedings to identify other potential references.
Selection of Studies
At least two authors with expertise in medicine and physiotherapy independently identified citations, selected studies, and reached consensus. Agreement for study selection was assessed using the quadratic weighted Kappa statistic (Kw) [19]. A third author was consulted in case of persisting disagreement.
Data Extraction and Management
At least two authors independently conducted data extraction. Pre-piloted forms were used for all phases, except for the evaluation of clinical applicability, where we followed the recommendations of Furlan 2009 [20].
Assessment of Risk of Bias in Included Studies
The COG used a calibrated team of assessors. At least two assessors independently assessed the risk of bias (Table 11). Risk of bias tables were presented and discussed by the broader COG validity assessment team to maximize inter-rater reliability [21]. Consensus was reached on the final presented risk of bias assessments following the updated Cochrane criteria [22]. Studies that met 6 or more of a maximum 12 criteria were considered to have low risk of bias and studies that met less than 6 were considered to have high risk of bias. The following characteristics for risk of bias were assessed: randomization, concealment of treatment allocation, withdrawal/drop-out rate, intention-to-treat analysis, selective outcome reporting, similar at baseline, similar co-interventions, acceptable compliance, similar timing of assessment, and blinding of patient, provider, and outcome assessor. Explicit details on study design were extracted including: number of patients analyzed and randomized, use of intention-to-treat analysis, and power analysis.
Table 1.
Table 1.
Risk of Bias
Measures of Treatment Effect
We used Revman version 5.0.14 to conduct statistical analysis. Descriptive statistics provided a summarized description of the patient groups, interventions, outcomes, adverse effect of treatments, and cost of care. All results reported were based on the sample size analysed using the 'intention-to-treat' principle. The Cochrane Back Review Group guidelines [20] were used to estimate minimum clinically important differences (MCIDs). For pain, it was assumed that the MCID was 10 points on a 100-point pain intensity scale [23-25]. For the neck disability index, a MCID of 7 of 50 neck disability index units were used [25, 26]. For other outcomes (i.e. global perceived effect and quality of life scales) where there was an absence of clear guidance on the size of a clinically important effect sizes, we used the common hierarchy of Cohen 1988 that discussed effect sizes as: small (0.20), medium (0.50) or large (0.80). For continuous outcomes reported as medians, we calculated effect sizes based on Kendal 1963 [27].
Unit of Analysis Issues
For continuous data, standardized mean differences with 95% confidence intervals (SMD; 95% CI) were used, since different measures were frequently used to address the same clinical outcome. We calculated relative risks (RR) for dichotomous outcomes. A relative risk less than one represents treatment benefit. When neither continuous nor dichotomous data were available, we extracted the study results and statistical significance as reported by the author(s) in the original study report and we noted these results in the characteristics of included studies table (Table 22).
Table 2.
Table 2.
Characteristics of Included Studies
Dealing with Missing Data
We contacted authors for missing data.
Assessment of Heterogeneity
Prior to calculation of a pooled effect measure, we assessed clinical heterogeneity through an examination of issues such as: symptom duration (acute vs chronic); subtype of neck pain (e.g. myofascial neck pain vs degenerative); intervention type (e.g. local anaesthetics vs corticosteroids); characteristics of treatment (e.g. dosage, technique); and outcomes (pain relief, measures of function and disability, patient satisfaction, quality of life). We pooled the studies if it was clinically sensible to do so, using random-effects models, since random-effects models are more conservative than fixed-effects meta-analysis. We assessed statistical heterogeneity using the Cochran Q test, by calculating I2 values (with I2 >50% considered to represent substantial heterogeneity) and tau squared values.
Assessment of Reporting Biases
Sensitivity analysis was used to examine for the influence of potential reporting bias on meta-analysis results.
Data Synthesis
We assessed the quality of the body of available evidence using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach [22]. Domains that may decrease the quality of the evidence are: 1) the study design, 2) risk of bias, 3) inconsistency of results, 4) indirectness (not generalizable), 5) imprecision (insufficient data), and other factors (e.g. reporting bias). The quality of the evidence was downgraded by a level based on the performance of the studies against these five domains.
Levels of quality of evidence were defined as:
  • High quality evidence: Further research is very unlikely to change our confidence in the estimate of effect. All of the GRADE domains are met.
  • Moderate quality evidence: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. One of the domains is not met.
  • Low quality evidence: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. Two of the domains are not met.
  • Very low quality evidence: We are very uncertain about the estimate. Three of the domains are not met.
  • No evidence: no RCTs were identified that measured the outcome of interest.
Subgroup Analysis and Investigation of Heterogeneity
For the majority of studies we analysed the results separately for duration of follow-up (immediately post treatment, short-term, intermediate term, and long-term) and subtypes of injection (intramuscular local anaesthetic, nerve block steroid, nerve block anaesthetic, epidural, intra-cutaneous neutral agent, and transforaminal steroid). We conducted a subgroup analysis of pooled studies to investigate clinical and statistical heterogeneity when necessary.
Sensitivity Analysis
Sensitivity analysis or meta-regression was considered for the following factors: symptom duration, risk of bias, and subtype of neck disorder and these were carried out when there was sufficient evidence to warrant these assessments.
Description of Studies
Considering all sources, 2432 records were identified through database searches and 22 records were found from other sources until March 2012. Following the screening step, there were 40 candidate publications evaluated in the selection phase (Fig. 11). Inter-rater agreement on study selection for inclusion was very good, with an estimated quadratic weighted kappa of Kw = 0.79 (SD 0.35) [19]. Three publications represented one trial [28-30].
Fig. (1)
Fig. (1)
PRISMA diagram showing the flow of reviews.
Thus of the 12 trials included (See Characteristics of included studies (Table 22), one was conducted in acute nonspecific neck pain, nine were in chronic MND (four in myofascial pain, one in radiculopathy, one in discogenic pain, one in cervicogenic headache, one in non-specific neck pain and one in a mixed disorder population) and two were conducted in patients with cervicogenic headache, where the duration of symptoms was not reported. There was a spectrum of interventions studied in these 12 trials including:
  • Four studies using IM local anaesthetic: [31-34].
  • Four studies using nerve block: steroid [28-30], anaesthetic [35-37].
  • One study using epidural steroid: [38].
  • Two studies using intracutaneous neutral agents such as carbon dioxide insufflation and saline respectively: [39,40].
  • One study using transforaminal steroid: [41].
We excluded 26 RCTs [42-67] that did not apply interventions of interest (54%; 14/26) (i.e. oral medication, botox, exercise or intravenous agents) or they used an inappropriate comparator (46%; 12/26) (See Characteristics of excluded studies - APPENDIX B).
Risk of Bias in Included Studies
We found four of the 12 trials had a low risk of bias [28-30,35,36,41] and 8 trials had high risk of bias [31-34,37-40]. See Fig. (22) for a summary graph of risk of bias assessments.
Fig. (2)
Fig. (2)
Risk of bias graph.
Regarding selection bias, we found that 67% (8/12) of the trials did not describe or use appropriate randomization methods and 83% (10/12) did not conceal allocation. The lack of both effective blinding for patients in 50% (6/12) and for the provider in 58% (7/12) of the trials contributed to performance bias. We found detection bias in 50% (6/12) of the trials due to lack of blinding of the outcome assessor. The drop-out rate was not reported and use of an intention to treat analysis was not described or inadequate in 58% (7/12) of the trials, contributing to an attrition bias. We found that the similarity of baseline characteristics in the most important prognostic indicators was also inadequate in 58% (7/12) of the included trials. We determined that co-interventions were not similar or not avoided in 92% (11/12) of trials and compliance to the intervention was unclear in 67% (8/12) of trials included. The timing of outcomes was similar in all but one trial, with the duration of follow-up assessment varying from 5 minutes post intervention to 24 months post. We determined that selective reporting was a high risk of bias in all studies as this item requires the authors to report the results for all outcome measures to be used in the study priori. Selective reporting can be problematic to assess as the published results need to be compared to their study protocol, with most studies not having adequate documentation of their study protocol. We explored publication bias for the meta-analysis - intramuscular injection (local anaethetic) in Fig. (44) using a Funnel Plot and could not rule publication bias. In other words, the asymmetrical plot suggests the smaller trials [32,34] of lower methodological quality produced exaggerated intervention effect estimates.
Fig. (4)
Fig. (4)
Funnel plot of comparison: for meta-analysis Intramuscular injection (local anaethetic - lidocaine) vs Control for outcome: pain intensity - short term.
In summary, we found the risk of bias to be high in the majority of studies. Five of the 12 trials appeared to be fatally flawed as they lacked reporting on almost all items in the Cochrane risk of bias criteria.
Effects of Interventions
We present our data in the summary of findings table (Table 33).
Table 3.
Table 3.
Summary of Findings Table
Evidence of Benefit
High or Moderate Quality Evidence
There were no physician-delivered injections that met the criteria for high or moderate quality evidence of benefit.
Low or Very Low Quality of Evidence
Intramuscular lidocaine injection with or without neck stretches vs dry needling or placebo
We found limited evidence that there may be benefit in the short-term with use of IM-lidocaine with or without stretching vs dry needling or placebo (4 trials [31-34] with 201 participants for pain with a pooled effect size of SMD -1.54 (95% CI -2.70 to -0.39)). These 4 trials were pooled because they were clinically similar in terms of the type of injection, location of injection and the patient population was chronic MNDs. However, the pooled results show considerable statistical heterogeneity (Tau² = 1.23; Chi² = 34.10, df = 3 (P < 0.00001); I2 = 91%). We explored sources of this heterogeneity arising from risk of bias, subtype disorder, duration of follow-up and co-intervention.
The reader is referred to Fig. (33) for a forest plot of different comparisons of subgroup and sensitivity analyses. After removal of the fatally flawed trials, the one remaining trial [31] showed a dramatic decrease in the treatment effect from SMD -1.54 (95% CI -2.70 to -0.39) in the pooled effect to SMD -0.31 (95% CI -0.75 to 0.14) for the single study. When we also removed Hong 1994 [34] since it included mixed disorder type participants and the other studies only looked at myofascial pain, this also resulted in a major decrease in magnitude of effect. Furthermore, a difference was seen favouring intervention when shorter term follow-up of 1 month studies (SMD -1.75(95% CI -2.43 to -1.08)) were compared to the 3 month follow-up studies (SMD -0.82(95% CI -1.85 to 0.22)). Finally as Esenyel 2000 [33] was the one study to include neck stretching exercises in combination with injection, we examined the effect of removing this study. Doing so resulted in no major change in the pooled effect.
Fig. (3)
Fig. (3)
Forest plot investigation of heterogeneity.
Based on very low quality evidence (1 trial [32]: 20 participants) there may be a benefit with the use of IM-lidocaine over dry needling on function and disability (SMD -1.05 (95% CI -2.00 to -0.10)) and quality of life (SMD -1.24 (95% CI -2.22 to -0.27)) over short-term follow-up.
Nerve Block Anaesthetic vs Control
We found low quality evidence (1 trial [36]; 20 participants) that there was a statistically significant improvement immediately post treatment for pain (SMD -3.60 (95% CI -5.12 to -2.07)) in a patient population with cervicogenic headache between those receiving greater occipital nerve blockade with prilocaine vs those receiving greater occipital nerve blockade with normal saline injection.
Low quality evidence from one trial [35] (47 participants) found a statistically significant improvement for pain [SMD -1.16 (95% CI -1.78 to -0.54)] in the short-term for patients with cervicogenic headache between those patients receiving occipital nerve blockade with lidocaine vs those receiving saline.
No other physician delivered injections were found to show evidence of benefit for pain, function and disability, quality of life, global perceived effect and patient satisfaction.
Evidence of No Benefit (vs Control) or No Difference (vs Active Comparison)
Moderate Quality of Evidence
Nerve Block: Steroid
We found moderate quality evidence (1 trial [28-30]; 120 participants) reporting no difference using a medial branch block with betamethasone and bupivacaine vs bupivacaine alone at short term (SMD -0.10 (95% CI -0.46 to 0.25)), intermediate term (SMD -0.22 (95% CI -0.57 to 0.14)) and long-term follow up (SMD -0.28 (95% CI -0.64 to 0.08)) for pain in patients with chronic non-specific neck pain. Further this trial reported no evidence of benefit for function and disability as well at short term (SMD 0.04 (95% CI -0.32 to 0.40)), intermediate term (SMD -0.08 (95% CI -0.44 to 0.28)) and long-term follow up (SMD 0.00 (95% CI -0.36 to 0.36)). For long term follow up, we have presented the data from 12 month follow-up alone because it does not differ importantly from the data reported at 2 year follow-up.
Low or Very Low Quality of Evidence
Intramuscular Lidocaine Injection vs Dry Needling
We found low quality evidence (1 trial [31]; 80 participants) that reported outcomes on pain at both 4 weeks (SMD -2.00 (95% CI -2.54 to -1.46)) and 12 weeks (SMD -0.31 (95% CI -0.75 to 0.14)). At 4 weeks there was evidence of benefit for IM-lidocaine vs dry needling; however, at 12 weeks there was no evidence of benefit of the injection over the control.
Epidural: Steroid
We found low quality evidence (1 trial [38]; 70 participants) that showed there was no difference in effect of betamethasone and lidocaine injected into the epidural space as compared to lidocaine alone, as assessed by pain short-term (SMD -0.24 (95% CI -0.71 to 0.23)), intermediate-term (SMD -0.23 (95% CI -0.70 to 0.24)), and long-term (SMD -0.25 (95% CI -0.72 to 0.22)). Further there was no evidence of additional benefit for function and disability over the short-term (SMD -0.24 (95% CI -0.71 to 0.23)), intermediate-term (SMD -0.25 (95% CI -0.72 to 0.22)), and long-term (SMD -0.25 (95% CI -0.72 to 0.22)).
Intracutaneous Neutral Agents vs Control
There was very low quality evidence from two studies that looked at intracutaneous neutral agents: carbon dioxide vs sham ultrasound (1 trial [39]; 126 participants) and water vs saline (1 trial [40]; 20 participants) in the short-term. Both studies showed there was no significant difference in effects from these agents vs the controls for pain in acute non-specific neck pain [39] or neck disorder with headache [40].
Transforaminal: Corticosteroid
We found low quality evidence from one study comparing depo medrol and carbocain vs carbocain alone ([41]; 40 participants) that showed there was no difference in outcomes of pain (RR 1.00 (95% CI 0.73 to 1.36) in the short-term between the two groups.
Nerve Block: Anaesthetic
We found very low quality evidence (1 trial [37]; 23 participants) of no significant difference in pain intensity between sphenopalatine ganglion block with lidocaine vs placebo in the short-term; however we were unable to extract data to confirm their data analysis.
Clinical Applicability and Relevance
We used three criteria to assess clinical applicability to practice (descriptions of the patient, interventions, and outcomes) and three to assess the clinical relevance of the results (relevance, benefits vs harms, and timing of evaluation). See Fig. (55) for a summary graph of clinical applicability assessments.
Fig. (5)
Fig. (5)
Clinical applicability and relevance.
We found that 42% (5/12) of included studies described the patient study population sufficiently. Only 17% (2/12) of studies provided adequate detail for the intervention protocol to allow the intervention to be replicated. These two studies [28-31] adequately described the skills, training and experience of the person who delivered the injection. All studies evaluated the effect of the treatment on pain, and three studies [28-30,32,38] also evaluated the outcome of function and disability. We found that 75% (9/12) of studies used appropriate timing for the evaluation of outcomes taking into consideration the drugs mechanism of action and expected treatment duration. Twenty-five percent (3/12) of studies adequately reported the rate and severity of adverse events, the adherence to treatment and the drop-out rate. Only two studies [32,34] demonstrated a clinically important difference in pain intensity between the treatment and the control groups. In 17% (2/12) of studies we concluded that the treatment benefits were worth the potential harms of the injection.
Adverse Events
Fifty-eight percent (7/12) of studies reported on adverse events. All adverse events described were transient and benign. Adverse events included: nerve root irritation, slight increase in mean pain levels, allergic reaction, increase in radicular pain, or the presence of pain, burning or paraesthesia at the injection site. See Table 44 for specific adverse events reported for each injection type.
Table 4.
Table 4.
Adverse Events
The conclusions from this systematic review update are limited due to the limited nature of the studies included. We found a high risk of bias, a low quality of evidence and limited clinical applicability of the results from these trials. Higher quality studies showing evidence of benefit are needed in order to be confident in the use of physician-delivered injections for MND and that these potential benefits exceed their risks. Further studies are warranted.
Summary of Main Results
In this update, we found no high or moderate quality evidence demonstrating the benefits of medicinal injections to treat MNDs. One low quality trial showed benefit for IM-lidocaine injection for chronic mechanical neck pain at 4 weeks but no persistence of the benefit at 12 weeks. We also found low and very low quality evidence for IM-lidocaine injection for chronic mechanical neck pain and nerve block anaesthetic for cervicogenic headache.
Only one moderate quality study was found and it showed that there was no difference between steroids and controls for mechanical neck pain. All other trials were low or very low quality and showed no benefit of injection over controls or placebo.
Overall Completeness and Applicability of Evidence
We found that the applicability of these trials to practice was limited. While all trials looked at the effect of medicinal injections on pain and a majority used appropriate timing of follow-up, many trials did not adequately describe the patient population or the intervention. The application of the noted treatments identified to be effective for mechanical neck pain may extend to other neck pain classification systems such as insidious onset of neck pain, traumatic neck pain, neck pain with headache. The concordance between neck pain classification systems is unclear and the clinical applicability will need to be based on sound clinical judgment. Few reported adequately on the severity of adverse events.
Quality of the Evidence
No conclusion regarding the effectiveness of medicinal injections for adults with MNDs could be made because there was a complete lack of high quality evidence supporting their use. There was only one moderate quality study ([28-30]; 120 participants) which had a low risk of bias, long-term follow-up (2 years) and a moderate sample size. The remainder of the studies were either low or very low quality. There was large heterogeneity across studies and therefore it was difficult to pool data to provide summary estimates of effects. Many of the studies reported here had small sample sizes and were conducted in a single centre, which limits their quality (GRADE) of the evidence.
Potential Biases in the Review Process
There may be language bias in our review because we did not explicitly search non-English databases; however, we did not exclude studies that weren’t published in English. We did not search the grey literature, such as, searching databases for unpublished work, writing to authors for additional unpublished data and contacting agencies and this review likely has a bias towards the published literature. We attempted to minimize this bias by employing a research librarian to complete very systematic bibliographic searches. We attempted to minimize selection bias by the use of two independent reviewers from different professional backgrounds to consider selection.
Agreements and Disagreements with Other Studies or Reviews
In the ICON review [16] the authors found low quality evidence to support the use of IM-lidocaine for chronic MND, and epidural methylprednisolone with lidocaine injection for radiculopathy. There was a lack of evidence for the effectiveness of different types of corticosteroids and local anaesthetics. The authors also concluded that larger high quality trials were needed to support the use of any of these medicinal injections.
Since the search strategy conducted to inform the ICON review was conducted, we found another more recent low quality trial showing benefit for IM-lidocaine for chronic MND in the short-term, but this did not change the ICON review findings. In addition, we found new data for medial branch block with steroid at 2 year follow-up which was also statistically similar to the 1 year follow-up data included in the ICON review.
Implications for Practice
Limited conclusions can be drawn from this review. There was very low quality evidence favoring IM-lidocaine injection for chronic mechanical neck pain and nerve block anaesthetic for cervicogenic headache. There was moderate evidence of no difference between steroid and control injections for mechanical neck pain. The remaining eight trials of low or very low quality studying epidural corticosteroid, intracutaneous carbon dioxide or water injections, transforaminal corticosteroid and sphenopalatine ganglion block, showed no benefit of injection over control or placebo. The use of medicinal injections for MNDs cannot be supported based on the current evidence database.
Implications for Research
Future high quality research is required to make evidence based conclusions on the value of physician-delivered injections to treat MNDs. These trials should include larger sample sizes and be conducted over multiple centres to increase validity and generalizability.
Clinical applicability and relevance can be addressed by more effectively describing the patient population and interventions in detail, including the qualifications and training of those administering the intervention. It would be beneficial to include outcome measures on function/disability, quality of life, patient satisfaction and global perceived effect in addition to pain. Finally, reporting on adverse events will inform conclusions on benefit vs harm of medicinal injections for MNDs.
ACKNOWLEDGEMENTS
This work was supported by Centric Health-LifeMark Industry Partner Grant. This is an interdisciplinary care service.
CONFLICT OF INTEREST
The authors confirm that this article content has no conflict of interest.
APPENDIX A: MEDLINE SEARCH STRATEGY.
Search Details: COG Injection (Neck Pain)-2012
OVID-Medline
1. Neck Pain/
2. exp Brachial Plexus Neuropathies/
3. exp neck injuries/ or exp whiplash injuries/
4. cervical pain.mp.
5. neckache.mp.
6. whiplash.mp.
7. cervicodynia.mp.
8. cervicalgia.mp.
9. brachialgia.mp.
10. brachial neuritis.mp.
11. brachial neuralgia.mp.
12. neck pain.mp.
13. neck injur*.mp.
14. brachial plexus neuropath*.mp.
15. brachial plexus neuritis.mp.
16. thoracic outlet syndrome/ or cervical rib syndrome/
17. Torticollis/
18. exp brachial plexus neuropathies/ or exp brachial plexus neuritis/
19. cervico brachial neuralgia.ti,ab.
20. cervicobrachial neuralgia.ti,ab.
21. (monoradicul* or monoradicl*).tw.
22. or/1-21
23. exp headache/ and cervic*.tw.
24. exp genital diseases, female/
25. genital disease*.mp.
26. or/24-25
27. 23 not 26
28. 22 or 27
29. neck/
30. neck muscles/
31. exp cervical plexus/
32. exp cervical vertebrae/
33. atlanto-axial joint/
34. atlanto-occipital joint/
35. Cervical Atlas/
36. spinal nerve roots/
37. exp brachial plexus/
38. (odontoid* or cervical or occip* or atlant*).tw.
39. axis/ or odontoid process/
40. Thoracic Vertebrae/
41. cervical vertebrae.mp.
42. cervical plexus.mp.
43. cervical spine.mp.
44. (neck adj3 muscles).mp.
45. (brachial adj3 plexus).mp.
46. (thoracic adj3 vertebrae).mp.
47. neck.mp.
48. (thoracic adj3 spine).mp.
49. (thoracic adj3 outlet).mp.
50. trapezius.mp.
51. cervical.mp.
52. cervico*.mp.
53. 51 or 52
54. exp genital diseases, female/
55. genital disease*.mp.
56. exp *Uterus/
57. 54 or 55 or 56
58. 53 not 57
59. 29 or 30 or 31 or 32 or 33 or 34 or 35 or 36 or 37 or 38 or 39 or 40 or 41 or 42 or 43 or 44 or 45 or 46 or 47 or 48 or 49 or 50 or 58
60. exp pain/
61. exp injuries/
62. pain.mp.
63. ache.mp.
64. sore.mp.
65. stiff.mp.
66. discomfort.mp.
67. injur*.mp.
68. neuropath*.mp.
69. or/60-68
70. 59 and 69
71. Radiculopathy/
72. exp temporomandibular joint disorders/ or exp temporomandibular joint dysfunction syndrome/
73. myofascial pain syndromes/
74. exp "Sprains and Strains"/
75. exp Spinal Osteophytosis/
76. exp Neuritis/
77. Polyradiculopathy/
78. exp Arthritis/
79. Fibromyalgia/
80. spondylitis/ or discitis/
81. spondylosis/ or spondylolysis/ or spondylolisthesis/
82. radiculopathy.mp.
83. radiculitis.mp.
84. temporomandibular.mp.
85. myofascial pain syndrome*.mp.
86. thoracic outlet syndrome*.mp.
87. spinal osteophytosis.mp.
88. neuritis.mp.
89. spondylosis.mp.
90. spondylitis.mp.
91. spondylolisthesis.mp.
92. or/71-91
93. 59 and 92
94. exp neck/
95. exp cervical vertebrae/
96. Thoracic Vertebrae/
97. neck.mp.
98. (thoracic adj3 vertebrae).mp.
99. cervical.mp.
100. cervico*.mp.
101. 99 or 100
102. exp genital diseases, female/
103. genital disease*.mp.
104. exp *Uterus/
105. or/102-104
106. 101 not 105
107. (thoracic adj3 spine).mp.
108. cervical spine.mp.
109. 94 or 95 or 96 or 97 or 98 or 106 or 107 or 108
110. Intervertebral Disk/
111. (disc or discs).mp.
112. (disk or disks).mp.
113. 110 or 111 or 112
114. 109 and 113
115. herniat*.mp.
116. slipped.mp.
117. prolapse*.mp.
118. displace*.mp.
119. degenerat*.mp.
120. (bulge or bulged or bulging).mp.
121. 115 or 116 or 117 or 118 or 119 or 120
122. 114 and 121
123. intervertebral disk degeneration/ or intervertebral disk displacement/
124. intervertebral disk displacement.mp.
125. intervertebral disc displacement.mp.
126. intervertebral disk degeneration.mp.
127. intervertebral disc degeneration.mp.
128. 123 or 124 or 125 or 126 or 127
129. 109 and 128
130. 28 or 70 or 93 or 122 or 129
131. animals/ not (animals/ and humans/)
132. 130 not 131
133. exp *neoplasms/
134. exp *wounds, penetrating/
135. 133 or 134
136. 132 not 135
137. (needl* or acupuncture or inject*)
138. *caine/ tox.
139. block*
140. or/137-139
141. 136 and 140
142. exp randomized controlled trials as topic/
143. randomized controlled trial.pt.
144. controlled clinical trial.pt.
145. (random* or sham or placebo*).tw.
146. placebos/
147. random allocation/
148. single blind method/
149. double blind method/
150. ((singl* or doubl* or trebl* or tripl*) adj25 (blind* or dumm* or mask*)).ti,ab.
151. (rct or rcts).tw.
152. (control* adj2 (study or studies or trial*)).tw.
153. or/142-152
154. guidelines as topic/
155. practice guidelines as topic/
156. guideline.pt.
157. practice guideline.pt.
158. (guideline? or guidance or recommendations).ti.
159. consensus.ti.
160. or/154-159
161. meta-analysis/
162. exp meta-analysis as topic/
163. (meta analy* or metaanaly* or met analy* or metanaly*).tw.
164. review literature as topic/
165. (collaborative research or collaborative review* or collaborative overview*).tw.
166. (integrative research or integrative review* or intergrative overview*).tw.
167. (quantitative adj3 (research or review* or overview*)).tw.
168. (research integration or research overview*).tw.
169. (systematic* adj3 (review* or overview*)).tw.
170. (methodologic* adj3 (review* or overview*)).tw.
171. exp technology assessment biomedical/
172. (hta or thas or technology assessment*).tw.
173. ((hand adj2 search*) or (manual* adj search*)).tw.
174. ((electronic adj database*) or (bibliographic* adj database*)).tw.
175. ((data adj2 abstract*) or (data adj2 extract*)).tw.
176. (analys* adj3 (pool or pooled or pooling)).tw.
177. mantel haenszel.tw.
178. (cohrane or pubmed or pub med or medline or embase or psycinfo or psyclit or psychinfo or psychlit or cinahl or science citation indes).ab.
179. or/161-178
180. 153 or 160 or 179
181. 141 and 180
APPENDIX B
Table thumbnail
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