Abstract
A 43-year-old female shiatsu therapist complained of sudden snapping of the metacarpophalangeal joints (MCPjs) of both ring fingers during a specific hand posture. The extensor tendon of the ring finger was dislocated ulnarly when the MCPj of the ring finger was flexed and deviated ulnarly and the MCPj of the middle finger was extended. Surgical exploration revealed an attenuated radial sagittal band. We plicated the juncturae tendinum of the extensor digitorum communis between the middle and ring fingers and released the ulnar sagittal band partially to centralise the extensor tendon excursion. Twenty-six months postoperatively, the patient regained full active and passive range of motion of all fingers without extensor tendon dislocation or snapping in either hand during work.
Highlights
Extensor tendon dislocation at the metacarpophalangeal joint (MCPj) of the hand has four etiologies: congenital origin, degenerative, traumatic, or spontaneous sagittal band rupture [1,2,3]
We report a rare case of spontaneous dislocation of the extensor tendons of both ring fingers caused by a specific hand posture in a shiatsu therapist
Dislocation of the extensor tendon usually presents with symptoms of pain and snapping at the MCPj during MCPj flexion
Summary
Extensor tendon dislocation at the metacarpophalangeal joint (MCPj) of the hand has four etiologies: congenital origin, degenerative, traumatic, or spontaneous sagittal band rupture [1,2,3]. Degenerative dislocation of the middle finger extensor tendon, which is the most frequent etiology, usually occurs in patients with rheumatoid arthritis [3]. We report a rare case of spontaneous dislocation of the extensor tendons of both ring fingers caused by a specific hand posture in a shiatsu therapist
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