A multi-center study on correlation between ankle.hindfoot function and three-dimeusional morpho-logical characteristic of ealcaneal fractures after surgical treatment

Abstract

Objective To find out the correlation of the ankle-hindfoot function to the three-dimen- sional morphological characteristic of ealcaneal fractures after surgical treatments based on the post-process- ing technique of CT images. Methods From December 2009 to January 2012, the original data of clinical information and CT scan of 146 patients with calcaneal fractures was collected in five hospitals according to the inclusion criteria, the exclusion criteria and the exit criteria. The original data was scanned by 16-detec- tor row CT scanner and the clinical information was collected from five hospitals. The restoration of the sub- talur facet was observed with the volume renderings. The surface shaded display （SSD） reconstruction com- bining three-dimensional measurement was utilized to measure the ealcaneus re]ated morphological parame- ters. The correlation study was carried out between the American Orthopaedic Foot and Ankle Society （AO- FAS） ankle-hindfoot score and the outcome after observation and measurement was analyzed. Results No significant correlation was found between the AOFAS score and the length of the calcaneus, the height of the posterior facet and the length of the posterior facet in male and female group. A significant inverse correla- tion was found between the Gissane angle and the AOFAS score in male group as well as in female group. A significant positive correlation was found between the B6h]er angle and the AOFAS score in male group as well as in female group. The congruity of the subtalar joint was observed in 38 cases, and the excellent and good rate of the AOFAS score was 89.5%. Unflat articular surface was found in 108 cases, and the excellent and good rate of the AOFAS score was 90.7%. Conclusion The restoration of ankle-hindfoot function was affected largely by part of angular parameters after calcaneal fractures, such as the Gissane angle and the Gissane angle; nevertheless part of morphological parameters and the congruity of the subtalar facet had no correlation to the restoration of ankle-hindfoot functions. Key words: Calcaneus; Fractures; Multicenter studies; Imaging, three-dimensional