Department of Orthopaedic Surgery;
China-Japan Union Hospital of Jilin University;
Jilin;
China.;
Department of Orthopaedic Surgery;
Endowed De- partment of Human Resources Development for Community Medicine;
Tokyo Medical University Ibaraki Medical Center;
Inashiki;
Japan;
Department of Orthopaedic Surgery;
University of Tsukuba;
Tsukuba;
Japan;
Cartilage; Repair; Joint; Distraction; Joint; Motion; Spongialization; External; Fixator;