Selection of the study cohort
ligamentous injury, patella resurfacing, knee arthroplasty, primary knee osteoarthritis, flexion deformity
SECONDARY, KNEE OSTEOARTHRITIS
The authors followed the guidelines for reporting parallel-groups, randomized, and controlled trials. From January 2021 to February 2022, 94 patients were enrolled in the study. They were qualified by a single experienced surgeon for TKR and were randomly divided into two groups, depending on the technique later used to establish tibial component rotation. Inclusion criteria were: primary knee osteoarthritis, varus or neutral lower limb alignment (0° to 15° varus), preoperative Insall-Salvati ratio between 0.8 and 1.2. Exclusion criteria included secondary knee osteoarthritis, any previous lower limb surgery or ligamentous injury, patients with severe deformity with > 15° of varus, valgus or fixed flexion deformity. All participants received on-label use of PERSONA posterior-stabilized implants without patella resurfacing. Patients were randomly assigned in a 1:1 ratio to undergo total knee arthroplasty with use of PERSONA PS (Zimmer Biomet) knee design with asymmetric baseplate. The rotation of the tibial component was performed with two different techniques.