Fig. 4From: Serum hyaluronic acid concentration predicts the progression of joint space narrowing in normal knees and established knee osteoarthritis – a five-year prospective cohort studyReceiver operating characteristic (ROC) curves for serum hyaluronic acid (sHA) and development of knee osteoarthritis from Kellgren−Lawrence (KL) grades 0 or 1. AUC area under curve, Odds odds ratioBack to article page