Fig. 1From: Higher risk of knee arthroplasty during ten-year follow-up if baseline radiographic osteoarthritis involves the patellofemoral joint: a CHECK Cohort StudyProportions of knees by radiographic OA pattern (no OA, isolated patellofemoral OA, isolated tibiofemoral OA, combined patellofemoral and tibiofemoral OA)Back to article page