遠位指節間関節の整復不能な掌側亜脱臼:見過ごされがちな原因
Koji Takamoto1, Takayoshi Ono2, Yutaka Morizaki1
1Department of Orthopedic Surgery, NTT Medical Center Tokyo, Shinagawa, Tokyo, Japan.
Abstract:
This report describes a rare case of irreducible closed volar subluxation of the distal interphalangeal (DIP) joint of the small finger following a sports injury. Closed reduction failed, leading to open surgery, which revealed ulnar condyle entrapment between a partially torn extensor tendon and volarly displaced oblique retinacular ligament (ORL). Flexing the proximal interphalangeal (PIP) joint to 90° while extending the DIP joint relaxed the ORL, enabling dorsal repositioning and successful reduction. Awareness of this mechanism may help hand surgeons achieve effective reduction. Level of Evidence: Level V (Therapeutic).
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