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a, b, c and d Conversion TKA after a failed UKA with patellofemoral arthritis. a AP knee with well-fixed components, mild lateral tibial subluxation. b Lateral knee with severe progression of patellofemoral arthritis and osteophytes. c AP with restored alignment and soft tissue balance, and a 10 mm polyethylene. d Lateral knee with anatomic sizing. No augments or stems were needed
