Description

The SIGMA™ Partial Knee System by DePuy Synthes is an advanced solution for unicompartmental knee osteoarthritis. Designed for patients with cartilage degeneration confined to a single compartment —either medial or lateral—, it offers a bone-sparing alternative to total knee arthroplasty.  Its tissue-preserving approach maintains both cruciate ligaments and the majority of the subchondral bone, allowing the knee to retain its natural proprioception and kinematics. This results in smoother motion, better control, and a more physiological gait compared to total replacement systems.

The contoured design of the femoral and tibial components enhances joint congruency, promoting balanced load distribution and reducing polyethylene wear. Precision-manufactured with high-performance materials, SIGMA™ Partial ensures secure fixation, outstanding stability, and exceptional long-term survivorship.
The minimally invasive surgical technique decreases blood loss, postoperative pain, and rehabilitation time, leading to faster patient recovery and improved satisfaction.
With more than two decades of proven clinical evidence worldwide, SIGMA™ Partial consistently demonstrates survival rates exceeding 95% at ten years, making it one of the most reliable and trusted unicompartmental systems in modern orthopedic practice.