Outcomes of the conservative hip preservation treatment in patients with osteonecrosis of the femoral head: With 4-year follow-up

Table 9 Clinical scores after conservative hip preservation treatment for osteonecrosis of the femoral head based on lesion size

Items	< 15%	15%-30%	> 30%	H	P value
Harris	82.50 (93.00, 67.00)	77.00 (93.00, 68.00)	72.00 (85.00, 60.25)	3.638	0.162
iHOT-12	111.00 (120.00, 98.00)	104.00 (110.00, 93.50)	98.00 (106.00, 91.25)	12.344	0.0021
WOMAC	30.00 (53.50, 18.00)	45.00 (61.50, 28.50)	46.00 (66.00, 36.00)	6.456	0.0401
VAS	2.00 (3.00, 0.00)	3.00 (4.50, 2.50)	3.00 (5.50, 3.00)	8.872	0.0121

¹Refers to a two-by-two comparison, where the results of the two-by-two comparison between the necrosis range > 30% group and the < 15% group were P (international Hip Outcome Tool 12) = 0.002, P (Western Ontario and McMaster Universities Arthritis Index) = 0.035, and P (visual analogue scale) = 0.009.

iHOT-12: International Hip Outcome Tool 12; WOMAC: Western Ontario and McMaster Universities Arthritis Index; VAS: Visual analogue scale.