Analysis of injury characteristics of peritalar dislocations using ankle models reconstructed with software Mimics / 中华创伤骨科杂志

ABSTRACT

Objective:To analyze the injury characteristics of peritalar dislocations using ankle models reconstructed with software Mimics.Methods:A retrospective study was conducted to analyze the medical records of 36 patients with peritalar dislocation who had been treated at Department of Orthopaedics, The Fourth Hospital of Wuhan from January 2008 to April 2022. There were 28 males and 8 females with an age of (46.0±14.6) years, and 16 left and 20 right limbs. Their CT data were imported into software Mimics to reconstruct ankle models to observe the fractures of the postero-medial process of the talus, the affiliated injuries to the surrounding bone structures outside the talus, and the complete or incomplete dislocations of the talonavicular articulation.Results:32 patients (88.9%, 32/36) had fracture of the postero-medial process of the talus, and 24 patients (66.7%, 24/36) a total of 33 affiliated injuries to the surrounding bone structures outside the talus, including 12 lateral malleolus ones, 4 medial malleolus ones, 7 scaphoid ones, 6 calcaneus ones, 3 fractures of the cuboid and 1 fracture of the fifth metatarsal. Sixteen patients were complicated with 1 affiliated injury, 7 patients with 2 affiliated injuries, and 1 patient with 3 affiliated injuries. The 8 patients with 2 or more affiliated injuries all had complete dislocation of the talonavicular articulation. Of the 36 patients, 26 had complete dislocation of the talonavicular articulation and 10 incomplete dislocation of the talonavicular articulation. The incidence of affiliated injuries [84.6% (22/26)] in the patients with complete dislocation of the talonavicular articulation was significantly higher than that [20.0% (2/10)] in those with incomplete dislocation of the talonavicular articulation ( P=0.001). Conclusions:Most of the peritalar dislocations are combined with the fracture of the postero-medial process of the talus. The incidence of complete dislocation of the talonavicular articulation is high. Patients with complete dislocation of the talonavicular articulation are more likely to have an affiliated injury, or even more than two injuries.