3D Printing Guides in Total Knee Arthroplasty

Inclusion Criteria: * Patients with advanced OA of the knee, varus deformity of no more than 15 degrees, flexion-contracture deformity of no more than 10 degrees, without extra-articular deformity of the knee; * Weight-bearing radiograph of the X-ray image showed the OA Kellgren-Lawrence classification grade Ⅳ; * The treatment for the patient was TKA, whether or not to use PSI depends on the actual grouping. Exclusion Criteria: * Patients with varus deformity of more than 15 degrees, flexion-contracture deformity of more than 10 degrees of the knee; * Patients with traumatic arthritis and inflammatory arthritis; * Patients with huge bone defects around the knee * Patients who had active infection around the knee; * Patients with knee valgus deformity; * Patients with severe extra-articular deformity; * Patients who had previous knee surgery; * Patients who had periarticular soft tissue dysfunction and neuropathy; * Patients who had poor physical condition and could not withstand the operation; * Patients who refused to be followed.