and in the immediate surrounding soft tissues of the dorsal wrist. The left upper extremity appeared well perfused with palpable radial pulses and brisk capillary refill. The compartments of the extremity were soft. Motor function was intact to the anterior interosseous muscles, posterior interosseous muscles, and ulnar nerves through demonstration of the cardinal hand motions. Wrist flexion and extension were limited and painful. Sensation was intact to light touch over the axillary, radial, median, and ulnar nerve distribution. Fluctuance, drainage, and evidence of superimposed infection were absent.The differential diagnosis included puncture wound, retained foreign body, soft-tissue infection, tenosynovitis, and fracture.