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

Table 4 Results of Harris Hip Score, international Hip Outcome Tool 12, visual analogue scale, and Western Ontario and McMaster Universities Arthritis Index before treatment and at the last follow-up

Items	Pre-treatment	Post-treatment	Z	P value
HHS	61.00 (77.00, 51.00)	75.00 (93.00, 67.00)	-9.389	< 0.001
iHOT-12	72.00 (80.00, 63.00)	102.00 (110.00, 94.00)	-9.472	< 0.001
WOMAC	90.00 (99.00, 75.00)	45.00 (63.00, 29.00)	-9.472	< 0.001
VAS	7.00 (7.00, 6.00)	3.00 (4.00, 2.00)	-9.326	< 0.001

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