Table 2. Comparison of the ARCO Classification, Range of Motion, Visual Analogue Scale and Harris Hip Score Before and After the Operation ^a,b.

	Preoperation	Postoperation	P Value
Pain, VAS	6.3 ± 4.1	1.4 ± 2	< 0.001
[range]	[4-9]	[1-5]
ROM, degree
Flexion	53.2 ± 16.3	113 ± 22	< 0.001
Extension	6.5 ± 3	9.4 ± 2.1	< 0.001
Abduction	12.5 ± 5.7	37.3 ± 11	< 0.001
Adduction	11.2 ± 8.2	28.3 ± 8.1	< 0.001
External rotation	15.2 ± 5.1	38.6 ± 9	< 0.001
Internal rotation	12.3 ± 4	24.6 ± 7.3	< 0.001
HHS	35.8 ± 15.3	79.5 ± 16.2	< 0.001
[range]	[28-51]	[67-95]

^a Abbreviations: ARCO, Association Research Circulation Osseous; HHS, Harris hip score; ROM, range of motion; VAS, visual analogue scale.

^b Data are presented as mean ± SD.