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OBJECTIVE: To explore in a cross sectional study in patients with primary knee osteoarthritis (OA) the relations between body mass index (BMI), disease stage, and the concentrations of a putative joint fluid marker of type II collagen synthesis, procollagen II C-propeptide.PATIENTS AND METHODS: The study included 142 patients with knee OA (median age 68, median BMI 24.1). OA was staged radiologica
