Mid-term outcomes following primary semi-constrained total knee arthroplasty in patients less than 60 years old, a retrospective review.

Introduction: Total knee arthroplasty (TKA) is a successful operation for osteoarthrosis. Typically, the knee can be balanced using posterior stabilized or cruciate retaining implants. However, in patients with severe deformity or ligamentous laxity, this cannot be obtained, and more constrained devices are needed.