Table 1.

Femoral heads shape-factor of the two groups

		Treated group n = 12	Control group n = 8
Right femoral head	Mean ± SD	0.61 ± 0.05	0.55 ± 0.06
	Range	0.49–0.67	0.42–0.62
Left femoral head	Mean ± SD	0.64 ± 0.02	0.65 ± 0.04
	Range	0.59–0.66	0.57–0.72
P value (right/left)		0.31	0.012

shape-factor = 4πA/P² where A is the femoral head area and P is the perimeter; P value was calculated by comparing the right and left femoral heads using Wilcoxon signed rank test.