High Tibial Osteotomy (HTO) With or Without Arthroscopy of the Knee Joint

Inclusion Criteria: * All patients booked for an HTO due to OA * Grades II to IV severity of OA by radiographic evaluation (Kellgren \& Lawrence grade) * OA of the knee primarily involving the medial compartment Exclusion Criteria: * Imaging evidence of significant knee joint pathology that would change the decision to do an HTO * An arthroscopy of the knee within 2 years of planned surgery * Active joint or systemic infection, * Major medical illness that would preclude undergoing surgery, * Patients who are unwilling or unable to be assessed according to study protocol for two years following surgery * Major psychiatric illness, developmental handicap or inability to read and understand the English language