Dorsal dislocation of the proximal interphalangeal joint with mild marrow oedema signal and low T1 signal at the middle phalangeal base. Generalised soft tissue swelling and oedema of the fourth finger. Oedema of the radial and ulnar collateral ligaments. The volar plate is avulsed from the middle phalanx volar lip and is retracted to the volar aspect of the proximal phalangeal neck. Extensor tendon, in particular the central slip, is intact. Flexor tendon is intact with no "buttonhole-ing" of the proximal phalangeal head.