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Fig. 4C —"Boxer knuckle." Transverse sonogram of dorsal aspect of third metacarpophalangeal (MCP) joint (different patient than B) shows initial anatomic position of extensor tendon of third finger when MCP joint is in extension. Note fluid in extensor tendon sheath in keeping with tenosynovitis and focal split of tendon. With flexion, there is ulnar subluxation of (split) extensor tendon (E) relative to metacarpal head (MC). For video, see supplemental Figure S4C. (Courtesy of Dhanju J, Toronto, ON, Canada)