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Correlation between NGF expression in synovial tissue and the Japanese Orthopaedic Association (JOA) score in patients with hip osteoarthritis. Correlation between NGF expression in synovial tissue and (a) domain I (pain), (b) domain II (range of motion), (c) domain III (gait), (d) domain IV (ability to perform activities of daily living), and (e) total JOA score. Data are Spearman's rho correlation coefficient. P < 0.05, statistically significant difference (underlined).
