The Medacta GMK SpheriKA Post-Marketing Surveillance Study

This study follows patients who have received a specific type of total knee replacement implant (the Medacta GMK SpheriKA) to track how well it performs over time. It is a post-marketing surveillance study, meaning the implant is already approved and used in routine care — researchers are simply collecting data on real-world outcomes to ensure it continues to perform safely and effectively. You may be eligible if: - You are between 18 and 80 years old at the time of your knee surgery - You need a primary total knee replacement (your first knee replacement in that joint) - You have intact ligaments on both sides of the knee - You are willing to sign an informed consent form and attend follow-up visits You may NOT be eligible if: - You have inflammatory arthritis (such as rheumatoid arthritis) - Your BMI is greater than 40 - You have had a previous total or partial knee replacement in the same joint - You have had a high tibial osteotomy or femoral osteotomy (certain bone correction surgeries) - You have a neuromuscular or neurological disorder affecting your ability to use the knee - You have a systemic disease causing progressive bone loss - You are immunocompromised or on long-term steroids (more than 30 days) - You have poor bone quality or an active knee infection - You are pregnant or breastfeeding Talk to your doctor to see if this trial is right for you.