Patellofemoral arthritis is osteoarthritis of the joint between the kneecap and the groove in the thighbone. It causes pain at the front of the knee, typically worse with stairs, squatting and kneeling.
Patellofemoral arthritis is osteoarthritis of the joint between the underside of the kneecap and the groove in the thighbone that it slides in. It causes pain at the front of the knee, most often felt with stairs, squatting, kneeling and rising from a chair, and is frequently accompanied by grating or crackling as the knee moves.
Assessment focuses on confirming the source of pain and how it behaves, checking kneecap tracking and alignment, and distinguishing patellofemoral arthritis from other causes of anterior knee pain. X-rays help confirm that the arthritis is limited to the kneecap compartment. Contributing factors such as prior kneecap injury, alignment, muscle strength, activity load and body weight are also reviewed, because these influence both symptoms and progression.
First-line care is usually non-surgical — education and activity modification to reduce loading of the kneecap, weight management where relevant, simple analgesia or a short course of anti-inflammatory medication where appropriate, and a physiotherapy program targeting quadriceps strength and kneecap tracking. A corticosteroid injection may help a painful flare. Where symptoms progress despite conservative care, referral for an orthopaedic surgical opinion is the appropriate next step.