From: Serum hyaluronic acid concentration predicts the progression of joint space narrowing in normal knees and established knee osteoarthritis – a five-year prospective cohort study
KL grade 0/1
KL grade 2/3
β
P value
Rate of joint space narrowing
0.15
0.021
0.24
0.008
Osteophyte formation
−0.05
0.422
0.25
0.017