Weightbearing Computed Tomography as a Novel Imaging Modality: Assessment of Peritalar Instability

Abstract
Peritalar instability is a complex pathological entity of the hindfoot. The main characteristics of peritalar instability include pathological alignment of the talus at the talocalcaneal joint level. Very often, peritalar instability is observed in patients with progressive collapsing foot deformity (PCFD). In the last decade, weightbearing computed tomography (WBCT) is increasingly accepted as an advanced imaging modality among foot and ankle surgeons. In patients with PCFD, WBCT can provide invaluable information for a better understanding of underlying deformity, including the presence of subfibular and/or sinus tarsi impingement, subluxation of the subtalar joint at the posterior and/or middle facet, and extent of degeneration of the subtalar and talonavicular joints.