Table 2. Differences of joint spaces between healthy side and operative side.

	Pre-operation			Post-operation
	Healthy side	Operative side	P	Healthy side	Operative side	P
Anterior space	2.16 ± 0.60	3.00 ± 1.03	< 0.001*	2.19 ± 0.60	3.10 ± 1.08	<0.001*
Superior space	2.52 ± 0.74	2.64 ± 0.83	0.305	2.60 ± 0.75	4.43 ± 1.29	<0.001*
Posterior space	2.15 ± 0.56	2.34 ± 0.75	0.074	2.14 ± 0.64	4.20 ± 1.11	<0.001*

^*Significant difference.