The Comparison of Anterior Knee Pain in Patella With or Without Denervation in Medial Unicompartmental Knee Arthroplasty

Inclusion Criteria: * Patients who diagnose with medial osteoarthritis (OA) of the knee with an Alhback score of 2, 3 and 4 (Ahlback 1968) and with any Kujala score for pre-operative anterior knee pain. * Older than 40 years of age. * pain on the medial joint line. * primary medial compartment osteoarthritis with a well preserved lateral compartment with competent cruciate ligaments with correctable intraarticular varus deformity. * ROM flexion up to 110° under anesthesia. Exclusion Criteria: * Patients with fixed varus deformity \> 15° * Inflammatory arthritis * Previous high tibial osteotomy or ACL reconstruction