人工足関節への置換範囲の違いが術後の足関節や踵骨の動きに与える影響

抄録

Revision surgery due to relatively high rates of implant subsidence is one of the critical problems after total ankle arthroplasty (TAA). Implants that replace only upper surface of the talus have been commonly used, but implants that replace the entire talus are expected to be a solution to the problem. Currently, little is known about in vivo kinematics of ankle joint after TAA, and a comparison of ankle joint kinematics after replacement with both implants is required. The purpose of this study is to analyze the effect of different areas of ankle joint replacement on the postoperative joint kinematics. In vivo ankle joint motion during dorsiflexion and plantarflexion was calculated by Go-ICP for a three-dimensional model created from CT images. There was no effect on the subtalar joint kinematics due to differences in replacement area. However, for the talocrural join, there were several significant differences in the amount of translation and rotation, and the entire talus replacement tended to have a wider range of motion. The results may provide useful information for selecting implant for TAA that do not require revision surgery.