Fig. 4
The percentage of muscles volume on the operated side in comparison with the contralateral side from pre-operation to 52 weeks postoperatively. a-d The muscle volume of piriformis decreased by 1.11% (p = 0.085) preoperatively, 1.64% (p = 0.062) at 6 weeks, 1.33% (p = 0.057) at 12 weeks and 7.79% (p < 0.01) at 52 weeks. e-h The muscle volume of internal obturator muscle decreased by 1.20% (p = 0.09) preoperatively, 7.28% (p < 0.01) at 6 weeks, 15.71% (p < 0.01) at 12 weeks and 24.18% (p < 0.01) at 52 weeks