Does surgeon handedness affect the outcomes after primary total knee arthroplasty? A retrospective cohort study

Table 2 Comparison of coronal alignment between both sides, n (%)

Radiographic parameters			Group D (n = 177)	Group N (n = 193)	P value	OR (95%CI)
HKA (degrees)	Preoperative, mean ± SD (range)		167.88 ± 9.34 (142 to 195)	167.94 ± 8.82 (141 to 195)	0.9561
	Postoperative, mean ± SD (range)		177.96 ± 3.13 (165 to 186)	178.55 ± 3.38 (170 to 187)	0.0821
	P value		< 0.0011	< 0.0011
	Safe zone (180° ± 3°)	Within	116 (65.5)	123 (63.7)	0.8032	1.08 (0.72-1.63)
		Outside	61 (34.5)	70 (36.3)
MPTA (degrees)	Measurement		88.90 ± 2.61 (78 to 95)	89.43 ± 2.71 (80 to 98)	0.0561
	Safe zone (90° to 87°)	Within	95 (53.7)	90 (41.4)	0.0222,a	1.63 (1.08-2.48)
		Outside	82 (46.3)	113 (58.5)
mLDFA (degrees)	Measurement, mean ± SD (range)		90.16 ± 2.54 (81 to 98)	89.76 ± 2.53 (82 to 101)	0.1401
	Safe zone (90° ± 3°), mean ± SD (range)	Within	139 (78.5)	154 (79.8)	0.7632	0.92 (0.55-1.53)
		Outside	38 (21.5)	39 (20.2)

¹Students' t-test compares the mean difference between variables.

²χ² test compares proportions between both groups.

^aP value < 0.05 was considered significance.

HKA: Hip-knee-ankle; MPTA: Medial proximal tibial angle; mLDFA: Mechanical lateral distal femoral angle; OR: Odds ratio; CI: Confidence interval.