Avulsion of the popliteus tendon.

Isolated avulsion of the popliteus tendon occurred in a 13-year-old patient who stepped awkwardly from a bus. This report of injury is of special interest because the forces are easy to interpret and reflect the expected mechanism of injury to the popliteus muscle-tendon complex. Furthermore, the injury has many features that may be confused with patellar subluxation and dislocation.