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Coupling angles (degrees) of the hip flexion-extension/knee rotation (top left) and hip abduction-adduction/knee rotation (bottom left) and the variability (degrees) of the hip flexion-extension/knee rotation (top right) and hip abduction-adduction/knee rotation (bottom right) joint couplings during phase 4, where the solid and dashed lines represent the non-acetabular lesion group (NG) and the acetabular lesion group (LG), respectively.
