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Snapping phenomena result from the sudden impingement between anatomical and/or heterotopical structures with subsequent abrupt movement and noise. Snaps are variously perceived by patients, from mild discomfort to significant pain requiring surgical management. snapping syndrome occurs at various site like hip, knee, shoulder and wrist. There are many cadaveric studies shows accessory tendon in first extensor compartment of wrist.
We present a 19 year old male presents catching sensation and occasional radial side wrist pain for 6 months. Finkelstein test was negative. Radiograph showed small bony projection over the radial styloid. MRI wrist was reported as normal but retrospective analysis of image shows multiple tendons. Intraopertively we found multiple accessory tendon of extensor pollicis brevis which is causing snapping. Fibrous tunnel release with tenotomy of few accessory tendons done. On table patients catching sensation was assessed and found to be relieved. Patient is not having snapping on his follow up visit and able to carry out his daily activity without difficulties.
There are various causes for snapping wrist syndrome. Multiple accessory tendon can also cause snapping as shown in this case report. Moreover am presenting this case to highlight the diagnostic failure with non dynamic radiological investigation and to consider multiple accessory tendon as differential diagnosis for snapping wrist syndrome. Also suggest dynamic study could be a better choice of investigation to diagnosis snapping syndrome. First compartment tunnel release with few accessory tendon slip tenotomy gives good result.
Snapping phenomena result from the sudden impingement between anatomical and/or heterotopical structures with subsequent abrupt movement and noise. Snaps are variously perceived by patients, from mild discomfort to significant pain requiring surgical management. Snapping phenomena have been reported commonly in hip, knee, ankle, wrist, elbow and shoulder. Snapping involves wide range of soft tissue structures that may be tendinous, ligamentous, or fibrocartilaginous. Non-symptomatic snaps are also frequent in the general population. Very minimally, snaps may be associated with significant pain or other debilitating symptoms, which define true symptomatic “snapping syndrome” [, ]. Extensor tendon compartments of the wrist are anatomical tunnels on the back of the wrist (fingers and thumb). The compartments are numbered with each compartment containing specific extensor tendons . Anatomical variations in the extensor tendons are common. Abductor pollicis longus (APL) and extensor digitorum (ED) are known to exhibit different variations with respect to their attachments. Abductor pollicis longus (APL) and Extensoe pollicic brevis (EPB) occupy the most lateral compartment of the extensor retinaculum in a single synovial sheath, crossing superficial to the radial styloid process. EPB origin from the posterior surface of the radius and the adjacent part of the interosseous membrane, distal to the attachment of the abductor pollicis longus (APL) and inserting into the posterior surface of the base of the proximal phalanx of the thumb after passing under the extensor retinaculum . Its primary function is described as extending the metacarpophalangeal joint (MCPJ) of the thumb, as well as stabilizing the MCPJ of the thumb by integrating into the extensor hood . APL originates from the posterior surface of radius, ulna and the interosseous membrane. The APL is usually inserted into the radial side of the base of the first metacarpal bone or the trapezium . One common anatomical variation in the first compartment, is separate synovial sheaths and compartments, which raises the number of compartments from six to seven . The EPB may be absent or fused completely with the APL . Double or triple extensor digitorum communis (EDC) to long fingers, single or triple EDC to ring finger and single or double EDC to small finger . A number of studies have indicated that the APL and EPB within the first extensor compartment is separated in 30%–60% of cases by either a complete or partial septum [, ]. Multiple tendinous insertion of APL in cadaver study by Krishnamurthy et al. . Knowing the anatomical variation has implication in clinical diagnosis and management. This case report has been reported in line with the SCARE criteria as described by Agha et al. 
A 19 year old right handed engineering male student presented with abnormal catching and thudding sensation on flexion of wrist and thumb and occasional wrist pain for past 6 months in his right wrist. As per patient history he had snapping from high school itself but become symptomatic during his college days. He is a recreational badminton player. He first notice thudding sensation during forceful smashing while playing. The pain was sharp in nature which occur along the course of tendons of the first extensor compartment. He is worried more of snapping and catching sensation which occurs whenever he deviates wrist to extreme ulnar aspect. No similar history in the past or in the family member’s. On examination mild tenderness over the radial styloid and palpable thud on palmar flexion of thumb. Finkelstein test was negative. No mass is palpable. Radiograph shows small bony projection over the radial styloid (Fig. 1). Magnetic Resonance Imaging (MRI) of wrist was reported normal before surgery. But retrospective analysis of MRI by radiologist along with intraoperative clinical picture suggestive of multiple tendon in first extensor compartment at the levele of base of first metacarpal [Fig. 2, Fig. 3, Fig. 4]. He was operated in view of bony projection which may be causing thudding sound by senior consultant of our department. Superficial radial nerve is identified and carefully retracted (Fig. 5). We found multiple tendon slips (Fig. 6) which is actually causing snapping by hitting against radial groove of first extensor compartment on thumb flexion. There is no thickening or synovial proliferation of tendon sheath. The tendon sheath is released over the dorsal aspect with tenotomy of few slips which were found to be slipping out of the groove on extreme ulnar deviation and bony prominence is removed which result in widening of tunnel space. On table patient catching sensation was assessed and found to be relieved. The operated limb was kept in arm pouch till removal of suture and then progressive wrist movement is allowed. The patient was reviewed after 3 weeks with full range of forearm rotation with slight limitation to ulnar deviation which may be due to pain along the scar. By 9 weeks he was completely free of pain and obtained full range of movements The patient was under regular follow up till 14 months post-surgery without recurrence of snapping and able to do his daily activities without any difficulty. He stopped playing badminton in fear of recurrence of symptoms.
The anatomical variation of extensor compartment of wrist is studied by various author both in clinical and cadaver settings. Multiple accessory tendon of APL , septum in first extensor compartment of wrist , absence of extensor pollicis brevis , accessory EPB upto three tendons  are some of the anatomical variation seen in wrist first extensor compartment. This anatomical variation has been suggested to be cause for various pathological condition. A number of studies have indicated that the presence of multiple osseofibrous compartments may be associated with a greater predisposition to de Quervain’s syndrome and may also contribute to the development of de Quervain’s tenosynovitis [, , ]. Numerous hypotheses have been proposed to explain the pathogenesis of trapeziometacarpal arthritis in relation to supernumerary APL tendon insertions [, ]. Zancolli reported good postoperative results with tenotomy of supernumerary APL tendons . Anatomic variation of the first extensor compartment (septation) has been frequently associated with the development and progression of a distinct entity, De Quervain’s tenosynovitis, where narrowing of the extensor pollicis brevis tunnel leads to impaired gliding resistance . Septation of the first extensor compartment proved to be significantly associated with the presence of arthritis (p = 0.013), in study by Opreanu et al.  Snapping wrist is caused by various condition. There is a case report on Snapping Wrist due to an Anomalous Extensor Indicis Proprius by Baker et al. in 2008 . Another case report on trigger wrist with Carpal Tunnel Syndrome was published by Patil et al. in 2014 . Snapping wrist due to subluxation of Extensor carpi ulnaris is reported by Cift et al. . This is the first ever case reported on snapping wrist due to multiple accessory tendons of first extensor compartment of wrist. The snapping because of multiple accessory tendons of first extensor compartment was not diagnosed clinically or radiologically in our case. Here we failed to do a dynamic study (Ultrasonogram of wrist) which could have been better investigation in diagnosis multiple accessory tendon which producing snapping . We suggest orthopedician to consider multiple accessory tendons as one of the cause for snapping wrist.
There are various causes for snapping wrist syndrome. Multiple accessory tendon can also cause snapping as shown in this case report. Moreover am presenting this case to highlight the diagnostic failure even with static radiological investigation and to consider multiple accessory tendon as differential diagnosis for snapping wrist syndrome.First compartment tunnel release with few accessory tendon slip tenotomy gives good result. Also suggest dynamic study could be a better mode of investigation.
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Yes. Institutional research committee. Government medical college Calicut, Kerala, India.
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All datas are collected by me and coauthors help me to construct structured manuscript.
Dr Rajesh. P Additional professor, department of orthopaedics govt. medical college Kozhikode.