Table 4.

Univariable and multivariable analyses of surgical complications after UKA

Complication	RA-UKA (n = 1297)	C-UKA (n = 5857)	Unadjusted P	Adjusted aOR	95% CI	Adjusted P
Pulmonary embolism, n (%)	0 (0.0)	5 (0.1)	0.593	–	–	0.983
DVT, n (%)	0 (0.0)	2 (0.0)	0.999	–	–	0.993
Blood loss anemia, n (%)	107 (8.2)	420 (7.2)	0.178	1.222	0.974–1.533	0.083

Values are presented as n (%). Unadjusted P values were obtained using chi-square or Fisher’s exact tests, as appropriate. Adjusted odds ratios (aORs) and 95% confidence intervals (CIs) were estimated using multivariable logistic regression adjusted for the covariates listed in Table 1, including calendar year fixed effects (YEAR 2016–2022). “–” indicates that adjusted estimates were not estimable because of sparse events and model nonconvergence; in such cases, the adjusted P value was derived from the Score test and should be interpreted cautiously. RA-UKA robotic-assisted unicompartmental knee arthroplasty, C-UKA conventional unicompartmental knee arthroplasty, DVT deep vein thrombosis, aOR adjusted odds ratio, CI confidence interval