The osteoarthritis examination for knee osteoarthritis varies from patient to patient. When a patient comes in with a basic complaint of pain and impaired walking activity, the first thing to look for on the physical examination is whether there is an O-leg or valgus knee in the lower extremity force line. If the patient has an O-leg, this basically indicates that there is a change in the medial joint space. If the patient has an external knee, there will be a change in the lateral joint space. Sometimes the patient is fine medially and laterally but complains of not being able to stand up when squatting, so a patellar compression test should be done to see if the patella and femoral articular surface is damaged. If there is pain in this area, patellofemoral arthritis will be considered. In the early stage, the patient complains of pre-patellar pain after climbing too much, walking too much or squatting too much, which is the earliest manifestation of osteoarthritis. This is the earliest manifestation of osteoarthritis. If the medial and lateral deformities of the joint appear later, this condition has reached a more advanced stage.