Figure 14.

Lateral hindfoot impingement in a 47-year-old woman with advanced acquired adult flatfoot deformity due to chronic posterior tibialis tendon dysfunction. Coronal fat-suppressed proton-density-weighted mag- netic resonance image depicts talocalcaneal impingement with obliteration of the sinus tarsi and abnormal contact between lateral talar process and calcaneus with sclerotic changes (black arrowheads), as well as subfibular impingement with bone marrow edema like signal, osseous hypertrophy and sclerosis at opposing surfaces of fibula and calcaneus (white arrow- heads). Note lateral subluxation of the peroneal tendons (arrows) with tendinosis and prominent surrounding inflammation