Figure 6

(a) Statistical distribution of the co-contraction index of the TA–G, RF–MH, TA–MH, and RF–G muscle pairs. (b) Temporospatial features in mild, moderate, and severe knee osteoarthritis. Severity based on the Western Ontario and McMaster Universities Osteoarthritis (WOMAC) physical function subscore. Muscle co-activation pattern of (c) TA–G, (d) RF–MH, (e) TA–MH, and (f) RF–G pairs in mild, moderate, and severe knee osteoarthritis. Severity based on the WOMAC physical function subscore. *p < 0.05 indicates significant difference. The error bar shows 95% confidence interval.