Fig. 2From: Differences in biomarkers of cartilage matrix turnover and their changes over 2 years in adolescent and adult volleyball athletesAdolescent collagen synthesis marker C-propeptide of type II procollagen (CPII) changes plotted against baseline International Knee Documentation Committee scores. N = 10 due to seven adolescent females missing baseline serum samples and one adolescent male missing a follow-up serum sampleBack to article page