Unicompartmental vs. segmental bicompartmental vs. total knee replacement: comparison of clinical outcomes

Table 5 Between-group statistical analysis of Western Ontario and MacMaster Universities Osteoarthritis Index (WOMAC) sub-scores

	UKR^a vs. BKR^b		UKR^a vs. TKR^c		BKR^b vs. TKR^c
	p value	95%CI	p value	95%CI	p value	95%CI
Pre-operative
Function	0.914	− 11.8 to 16.6	0.031^*	1.0 to 25.7	0.073	−0.8 to 22.7
Pain	0.863	− 13.0 to 18.5	0.435	− 6.3 to 19.8	0.793	−9.3 to 16.2
Stiffness	0.851	− 14.6 to 23.1	0.575	−9.4 to 22.9	0.921	−13.2 to 18.3
6 months
Function	0.808	− 18.3 to 31.1	0.706	− 15.9 to 31.6	0.966	− 15.6 to 12.6
Pain	0.275	− 7.7 to 35.7	0.227	− 6.4 to 35.2	0.997	− 13.0 to 13.7
Stiffness	0.275	− 7.9 to 36.5	0.279	− 7.6 to 34.8	0.991	− 14.3 to 12.9
1 year
Function	0.589	− 11.2 to 26.5	0.349	− 7.6 to 28.4	0.920	−14.2 to 19.7
Pain	0.498	− 9.0 to 24.8	0.328	− 6.5 to 25.7	0.961	− 13.5 to 16.9
Stiffness	0.686	− 13.8 to 28.3	0.508	− 10.8 to 29.4	0.963	− 16.9 to 21.0
2 years
Function	0.197	− 6.7 to 40.6	0.850	− 19.4 to 30.4	0.424	− 10.8 to 33.8
Pain	0.522	− 12.8 to 33.6	0.990	− 23.0 to 25.8	0.396	− 10.2 to 33.6
Stiffness	0.304	− 11.0 to 45.6	0.929	− 25.3 to 34.2	0.472	− 13.9 to 39.5

One-way analysis of variance (ANOVA) and Tukey’s post-hoc pairwise comparison
95%CI confidence interval of mean difference
^*Statistically significant at <0.05 level.
^aUKR unicompartmental knee replacement group (6 months: n = 25; 1 year: n = 18; 2 years: n = 9)
^bBKR bicompartmental knee replacement group (6 months: n = 41; 1 year: n = 29; 2 years: n = 16)
^cTKR total knee replacement group (6 months: n = 45; 1 year: n = 26; 2 years: n = 14)

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