A new classification of talocalcaneal coalitions based on computed tomography for operative planning

Abstract Background Current classifications emphasize the morphology of coalition, however, subtalar joint facets involved should also be emphasized. Objective The objective this study was to develop a new classification system based on articular cover all coalitions and guide operative planning. Methods Patients were diagnosed with talocalcaneal coalition using CT scan, between January 2009 February 2021. classified into four main types according shape nature coalition: I, inferiorly overgrown talus or superiorly calcaneus; II, both calcaneus overgrew; III, an accessory ossicle; IV, complete osseous (I-III are non-osseous coalition). Then each type further divided three subtypes involved. A, involving anterior facets; M, middle facets, P, posterior facets. Interobserver reliability measured at (based shape) subtype (articular facet involved) weighted Kappa. Results There 106 patients (108 ft) included in study. Overall, 8 ft (7.5%) as 75 (69.4%) 7 (6.5%) 18 (16.7%) IV. Twenty-nine (26.9%) only (subtype-P), 74 (68.5%) (subtype-MP), five (4.6%) simultaneously anterior, middle, (subtype-AMP). Type II-MP most common. value Kappa for 0.93 (95%CI 0.86–0.99) ( p <0.001), 0.78 0.66–0.91) <0.001). Conclusion A facilitate planning developed.