Revision 14 for 'Semimembranosus distal tendon avulsion'

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Semimembranosus tendon avulsion

Semimembranosus tendon avulsion is a specific type of avulsion injury that can occur in the knee

Pathology

Mechanism of injury

External rotation and abduction of the flexed knee or valgus force applied to the tibia. Associated injuries include anterior cruciate ligament (ACL) rupture and posterior horn medial meniscal tear.

Radiographic features

Plain radiograph

Very hard to detect on plain film and may be seen in lateral view as a displaced bony fragment.

MRI

Best to detect the lesion and associated soft tissue injuries. The small bony fragment may be displaced or in situ. Associated anterior cruciate ligament rupture, posterior horn of medial meniscal tear and meniscocapsular separation are usually associated.

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