Table 4.

WOMAC and OKS in the two study groups at different time points during the study.

Parameter	Time point	UTKA	p value∗ (vs. preoperative)	SSBTKA	p value∗ (vs. preoperative)	p value† (UTKA vs. SSBTKA)
OKS	Preoperative	15.16 ± 2.93	–	14.12 ± 2.98	–	<0.001
	3 months p.o.	37.01 ± 5.67	<0.001	36.34 ± 3.44	<0.001	0.006
	6 months p.o.	42.99 ± 1.75	<0.001	42.75 ± 2.31	<0.001	0.020
	12 months p.o.	46.78 ± 0.98	<0.001	46.42 ± 1.76	<0.001	<0.001
WOMAC	Preoperative	44.19 ± 4.77	–	44.21 ± 4.85	–	0.923
	3 months p.o.	80.66 ± 6.58	<0.001	78.53 ± 5.43	<0.001	<0.001
	6 months p.o.	92.07 ± 2.07	<0.001	91.44 ± 43.38	<0.001	<0.001
	12 months p.o.	97.57 ± 1.05	<0.001	96.88 ± 2.96	<0.001	<0.001

Values are presented as mean ± standard deviation. ∗Calculated using the paired t-test, with p values < 0.05 considered statistically significant. ^†Calculated using the independent t-test, with p values < 0.05 considered statistically significant. UTKA: Unilateral total knee arthroplasty; SSBTKA: Simultaneous sequential bilateral total knee arthroplasty; OKS: Oxford Knee Score; WOMAC: Western Ontario and McMaster Universities Osteoarthritis Index; p.o.: postoperative.