Tibialis posterior tear
Pain and swelling along the medial aspect of the ankle. Marker was applied to the patient's complaint.
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The tibialis posterior tendon (behind the medial malleolus) is markedly thickened (compare it to the adjacent flexor digitorum tendon), showing intrasubstance degenerative signal and partial tear (evident along its anterior fibers), its tendon sheath is distended by fluid signal (tenosynovitis).
Adjacent bone marrow edema of the medial malleolus is noted and extensive subcutaneous soft tissue edema signal.
Type I tibialis posterior tendon tear.
Chronic posterior tibial rupture is divided into 3 types:
- type I: incomplete/partial tear with diffuse tendon enlargement showing intrasubstance degeneration/longitudinal splits.
- type II: partial tear with diffusely thinned tendon.
- type III: complete tear.