Prospective review of 11 knees (8 patients, 6 female). Average age at primary PFR – 64 years Indication – isolated patellofemoral osteoarthritis (11), patellofemoral instability (3) 9 knees (7 patients) temporarily improved. Revision Avon PFR at average 83 months after primary procedure. Indication – polyethylene wear polyethylene synovitis femoral component malposition At review: average 61 months after revision age – 70 years 10 months. fixed flexion contracture 1.7° maximum flexion 111°. Bristol knee score improved from average of 54.5 to 77.2. Pain score component averaged 25, functional component averaged 16.9. No malalignment or instability. Average American Knee Society Score 132.8 Bartlett patellar score 19.8 Three patients (4 knees) had medical problems contributing to their functional incapacity. No radiological complications except minor polyethylene wear on lateral facet of one patella. Progression to tibiofemoral osteoarthritis (Ahlburgh grade 1) in 3 knees.
