Isolated popliteus muscle rupture in polo players.

Isolated rupture of the popliteus muscle seems to be extremely rare, with only two cases described in the English literature. We present two cases of magnetic resonance imaging-verified isolated rupture of the popliteus muscle in polo players with the same injury mechanism-external rotation trauma on a flexed knee. Functional testing of the popliteus muscle in the figure of four position was positive in both cases. Full recovery was observed after 6 weeks of physiotherapy.