Highlights
knee arthroplasty, lower extremity deformity, TKA

We verify the effectiveness and safety of a new robotic-assisted total knee arthroplasty (TKA) system (Jianjia, Hangzhou Jianjia Robot Co. Ltd.) in humans.We discussed the factors affecting postoperative hip–knee–ankle (HKA) angle deviation, which was considered as the main evaluation index.We performed stratified analysis of patients with different degrees of preoperative lower extremity deformity and attempted to determine why the robotic-assisted knee replacement system showed conflicting results in different studies.