Knee awareness and functionality after simultaneous bilateral vs unilateral total knee arthroplasty

Table 1 Post-matching distribution of demographic parameters

		Bilateral	Unilateral
Gender, No. of knees (%)	Male	34 (36%)	34 (36%)
	Female	60 (64%)	60 (64%)
Age at operation, mean (SD) range		66 yr (8.2)	65 yr (7.4)
		45, 81	46, 80
Osteoarthritis grade, No. of knees (%)	KL 1 + 2	27 (29%)	27 (29%)
	KL 3 + 4	67 (71%)	67 (71%)
Alignment, mean (SD) range	Preoperative	1.2 (5.3)	1.3 (5.9)
		-16.3, 16.21	-12.1, 21.81
	Postoperative	5.2 (3.0)	4.9 (3.4)
		-1.1, 12.81	-11.2, 12.81
Operation year, No. of knees (%)	2010	24 (26%)	24 (26%)
	2011	62 (66%)	62 (66%)
	2012	8 (9%)	8 (9%)

¹Varus (-), Valgus (+). KL: Kellgren-Lawrence.

Table 2 Results for the Oxford Knee Score and Forgotten Joint Score

		SBTKA	UTKA
PROM outcomes, mean (SD) range	OKS	37.6 (9.0)	36.1 (9.9)
		10, 48	9, 48
	FJS	59.9 (27.5)	57.5 (28.8)
		0, 100	0, 100

FJS: Forgotten Joint Score; OKS: Oxford Knee Score; SBTKA: Simultaneous bilateral TKA; UTKA: Unilateral TKA; TKA: Total knee arthroplasty; PROM: Patient-reported outcome measure.