Patients experiencing patellofemoral knee arthritis will have pain and stiffness and often swelling in the front part of the knee that typically worsens when walking on inclined terrain, going up and down stairs, squatting or rising from a seated position.
Patellofemoral arthritis is diagnosed when there is significant loss of cartilage from the joint surface of the patella and the trochlea (groove). The diagnosis is restricted to arthritis seen only in this compartment of the knee; if the medial and lateral compartments are affected, generalized osteoarthritis of the knee is the likely diagnosis. (As with other disorders of the patellofemoral joint, it is more frequently seen in women)
see also Arthritis - Knee