Natural course of knee osteoarthritis in middle-aged subjects with knee pain: 12-year follow-up using clinical and radiographic criteria
Objective: To explore the natural course of knee osteoarthritis (OA) in a middle-aged population with chronic knee pain. Methods: A population-based sample of 143 subjects (mean age 45 (range 35-54), 44% women) with knee pain (>3 months) at inclusion was studied. Weightbearing posteroanterior tibiofemoral (TF) radiographs were obtained at baseline and 12 years later, and classified according to Ke