Table 4.

Comparison of Harris score of the hip joint before and after operation between the two groups

Group	n	Preoperative	3 months after operation	6 months after operation	Latest follow-up	Statistic
Observation group	32	1.95 ± 0.30#αβ	3.95 ± 0.48*αβ	5.16 ± 0.61*#β	8.14 ± 0.77*#αβ	F = 805.128 P = 0.000
Comparison group	36	1.88 ± 0.72#αβ	3.18 ± 0.45*αβ	4.98 ± 0.70*#β	7.93 ± 0.80*#αβ	F = 526.771 P = 0.000
Statistic		t = 0.647	t = 7.684	t = 1.292	t = 1.240
		P = 0.521	P = 0.000	P = 0.200	P = 0.219

*Compared with preoperative value, P < 0.05; ^#compared with the value at 3 months after the operation, P < 0.05; α: compared with the value at 6 months after the operation, P < 0.05; β: compared with the value at 9 months after the operation, P < 0.05