One hundred fourty patients with primary or secondary knee osteoarthritis were randomized to receive either a cruciate-retaining (CR) implant (n=72) or a posterior-stabilized (PS) implant (n=68). The primary outcome was knee function, including range of motion (ROM) and flexion. Secondary outcomes included patient-reported outcome measures (PROMs), complication and reoperation rates, and satisfaction. Outcomes were assessed at baseline, 3 months, 1 year, and 2 years postoperatively. Overall, the results of the study revealed that the PS group had better knee flexion and ROM at 1 and 2 years, but no significant differences in PROMs or satisfaction compared to the CR group. These findings suggest that while PS implants may offer improved flexion, this advantage does not translate into perceived clinical benefit.