Semimembranosus distal tendon avulsion
Updates to Article Attributes
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was changed:
Semimembranosustendon 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.
Differential diagnosis
-
fat in the distal semimembranosus tendon
- recognised normal variant
- the tendon attachment to the tibia should remain intact
- no tendon retraction
-<p><strong>Semimembranosus<strong> </strong>tendon avulsion</strong> is a specific type of <a href="/articles/avulsion-injuries">avulsion injury</a> that can occur in the <a title="Knee joint" href="/articles/knee-joint-1">knee</a>. </p><h4>Pathology</h4><h5>Mechanism of injury</h5><p>External rotation and abduction of the flexed knee or valgus force applied to the tibia. Associated injuries include <a title="Anterior cruciate ligament tear" href="/articles/anterior-cruciate-ligament-tear">anterior cruciate ligament (ACL) rupture</a> and posterior horn medial <a title="Meniscal tear" href="/articles/meniscal-tear">meniscal tear</a>.</p><h4>Radiographic features</h4><h5>Plain radiograph</h5><p>Very hard to detect on plain film and may be seen in lateral view as a displaced bony fragment.</p><h5>MRI</h5><p>Best to detect the lesion and associated soft tissue injuries. The small bony fragment may be displaced or in situ. Associated <a href="/articles/anterior-cruciate-ligament-tear">anterior cruciate ligament rupture</a>, posterior horn of medial <a href="/articles/meniscal-tear">meniscal tear</a> and <a href="/articles/meniscocapsular-separation">meniscocapsular separation</a> are usually associated.</p>- +<p><strong>Semimembranosus<strong> </strong>tendon avulsion</strong> is a specific type of <a href="/articles/avulsion-injuries">avulsion injury</a> that can occur in the <a href="/articles/knee-joint-1">knee</a>. </p><h4>Pathology</h4><h5>Mechanism of injury</h5><p>External rotation and abduction of the flexed knee or valgus force applied to the tibia. Associated injuries include <a href="/articles/anterior-cruciate-ligament-tear">anterior cruciate ligament (ACL) rupture</a> and posterior horn medial <a href="/articles/meniscal-tear">meniscal tear</a>.</p><h4>Radiographic features</h4><h5>Plain radiograph</h5><p>Very hard to detect on plain film and may be seen in lateral view as a displaced bony fragment.</p><h5>MRI</h5><p>Best to detect the lesion and associated soft tissue injuries. The small bony fragment may be displaced or in situ. Associated <a href="/articles/anterior-cruciate-ligament-tear">anterior cruciate ligament rupture</a>, posterior horn of medial <a href="/articles/meniscal-tear">meniscal tear</a> and <a href="/articles/meniscocapsular-separation">meniscocapsular separation</a> are usually associated.</p><h4>Differential diagnosis</h4><ul><li>fat in the distal semimembranosus tendon<ul>
- +<li>recognised normal variant</li>
- +<li>the tendon attachment to the tibia should remain intact</li>
- +<li>no tendon retraction</li>
- +</ul>
- +</li></ul>
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