Prospective Functional, Gait, and Outcome Comparison Study of Medial Pivot Versus Single Radius Design for Total Knee Arthroplasty

This study compares two different designs of total knee replacement (TKA) implants: the Medial Pivot design (MicroPort Evolution) and the Single Radius design (Stryker Triathlon). Both are approved and commonly used. The researchers want to find out if one design leads to better walking patterns, movement, and function after surgery compared to the other. Participants will have their gait (walking pattern) analyzed in a laboratory before and after surgery, and will return for scheduled follow-up visits. This study does not involve any experimental treatments — both implants are already approved for clinical use. You may be eligible if: - You are between 18 and 75 years old - You are scheduled for your first total knee replacement on that knee (no prior prosthetic on that knee) - You are currently able to walk and do not have a condition on the other leg that would interfere with gait testing - Your BMI is 40 or below - You are willing to attend all follow-up visits You may NOT be eligible if: - You are under 18 or over 75 years old - You have had a previous knee replacement on the operative knee - You have avascular necrosis or inflammatory arthritis - You have a BMI greater than 40 - You have a mental or neuromuscular disorder that would affect implant stability or recovery Talk to your doctor to see if this trial is right for you.