A 3‐DOF electromotor‐driven external fixator for foot and ankle deformity correction based on X‐ray digital measurement

Abstract Background The use of external fixators to treat foot and ankle deformities remains a challenge in orthopedic surgery due to their diversity. We hope to improve the automation and accuracy of the correction process. Methods A three‐degree‐of‐freedom (3‐DOF) electromotor‐driven external fixator for uniplanar foot and ankle deformities was proposed. Computer‐assisted correction software was developed to help surgeons use digital technology to measure the required parameters from patients' X‐ray radiographs. The correction trajectory and the prescriptions were generated in the software based on the proposed correction strategy. Results Two clinical cases were simulated to verify the correction ability of the developed external fixator. The results showed that the angular and displacement deformities were well corrected. Conclusions The developed external fixator can accurately and automatically correct foot and ankle deformities with the help of computer‐assisted correction software, which significantly reduces the burden on surgeons and patients.