In knee osteoarthritis, localised pain is often identified along the medial joint line or distalto the patellofemoral attachment. Medial pain is usually correlated with anatomic changes, as the medial compartment is involved in 70% of knee osteoarthritis cases [3]. In patients who have lateral compartment osteoarthritis, pain and grinding is localised to the lateral part of the knee and arthritic destruction is manifested as a valgus deformity [6].