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Variation of osteoarthritis-to-normal ratios (ONRs) of CTX-II (C-telopeptide of type II collagen) (a) and OC (osteocalcin) (b) in operated rabbits with different severities of osteoarthritis as categorized according to the OOCHAS scores as: mild (scores = 0–10), moderate (scores = 10.5–20), advanced (scores = 20.5–30), and far-advanced (scores = 30).
