29-year-old male with pain over the inferior lateral malleolus after exercise. Evaluate for hindfoot coalition versus peroneal tendinopathy. TENDONS: The flexor and extensor tendons appear intact. The peroneal tendons appear intact.LIGAMENTS: The deltoid ligament appears is normal limits. The distal tibiofibular syndesmotic complex appears intact. The lateral collateral ligament complex appears intact.ARTICULAR SURFACES AND BONE: There is deformity of the sustentaculum talus of the calcaneus and corresponding medial talar articulation with cysts in the underlying medullary space and irregularity of the articular surface of the middle facet of the subtalar joint. These findings indicate a nonosseous (fibrous) coalition. There is also mild edema-type signal abnormality within the body of the talus underlying the posterior facet of the subtalar joint which may be degenerative in etiology. There is focal signal irregularity of the articular cartilage of the middle of the posterior facet of the subtalar joint which may reflect degeneration. There is mild sclerosis along the angle of Gissane. The tibiotalar joint appears within normal limits.
Findings compatible with nonosseous (fibrous) coalition of the middle facet of the subtalar joint with associated bony deformity and other findings as described above.