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Internal Derangement of the Ankle and Foot 

Internal Derangement of the Ankle and Foot
Internal Derangement of the Ankle and Foot

Laura W. Bancroft

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date: 28 January 2022

Chapter 109 discusses MRI of the ankle and foot internal derangements, namely tendon and ligament tears, osteochondral defects, and miscellaneous. Tenosynovitis may be detected anywhere in the ankle and foot, except along the Achilles tendon where a tendon sheath is absent and there is a paratenon. Tendinosis and tendon tears occur most commonly in the Achilles, posterior tibial, and peroneal tendons. Peroneal tendons may subluxate or dislocate anteriorly with superior peroneal retinacular disruption or may become transposed with intrasheath dislocations. The anterior talofibular ligament is the most commonly torn ankle ligament caused by inversion injuries. Calcaneofibular ligament tears may occur in conjunction with an anterior talofibular ligament tear. MRI is helpful in differentiating stable from unstable talar dome osteochondral defects, because of high spatial resolution of the articular cartilage and underlying bone.

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