Swan-neck deformity is described as a flexion posture of the distal interphalangeal joint and a hyperextension posture of the proximal interphalangeal joint. This case had an acute trauma history. The physical examination and the plain X-ray view excluded the collateral ligament and bony injuries. Finally, the incarcerated volar plate at the metacarpophalangeal (MCP) joint was identified as the main cause. After the intra-articular pathology was resolved and the joint position was restored, the symptoms were relieved and thumb functioning recovered.
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