Partial vs Total Knee Replacement for Medial Knee Osteoarthritis: a Prospective Randomized Controlled Study

The goal of this clinical trial is to learn whether partial knee replacement (unicompartmental knee arthroplasty, UKA) or total knee replacement (total knee arthroplasty, TKA) leads to better clinical and functional outcomes in adults with medial knee osteoarthritis who are candidates for knee arthroplasty. The main questions the study aims to answer are: * Does UKA or TKA result in better patient-reported outcomes, such as knee pain, function, and quality of life (measured by Oxford Knee Score, WOMAC, and Knee Society Score)? * Does UKA or TKA lead to differences in complications or revision rates during follow-up? Researchers will compare UKA to TKA to see whether one procedure provides superior postoperative recovery, knee function, and long-term outcomes under standard clinical care conditions. Participants will: * Receive either a unicompartmental or total knee replacement, assigned by randomization. * Undergo routine postoperative examinations, including standardized questionnaires (e.g., Oxford Knee Score, WOMAC, Knee Society Score, VAS). * Attend follow-up visits at standard clinical intervals (e.g., 6 weeks, 6 months, 1 year, 2 years, and beyond).