, also known as Pott’s syndrome I
and Dupuytren fracture
, is an archaic term loosely applied to a variety of bimalleolar ankle fractures. The injury is caused by a combined abduction external rotation from an eversion force. This action pulls on the extremely strong medial ligament, often tearing off the medial malleolus
. The talus
then moves laterally, shearing off the lateral malleolus
or, more commonly, breaking the fibula
superior to the tibiofibular syndesmosis
. If the tibia is carried anteriorly, the posterior margin of the distal end of the tibia is also sheared off by the talus.
The bimalleolar fractures are less likely to be arthritic than trimalleolar fractures.
English physician Percivall Pott
experienced this injury in 1765
and described his clinical findings in a paper published in 1769
The term "Dupuytren fracture" refers to the same mechanism, and it is named for Guillaume Dupuytren.