Semimembranosus tendon avulsion

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

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.

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

MRI is the best modality to detect the lesion and additional 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 present.

  • fat in the distal semimembranosus tendon
    • recognized normal variant
    • the tendon attachment to the tibia should remain intact
    • no tendon retraction
Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

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Article information

rID: 22928
Section: Gamuts
Synonyms or Alternate Spellings:
  • Avulsion of semimembranosus tendon
  • Semimembranosus tendon avulsions
  • Avulsion of the semimembranosus tendon

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Cases and figures

  • Case 1: non displaced semimembranosus tendon avulsion
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  • Case 1: defect at posteromedial tibia
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