Unicompartmental knee arthroplasty vs high tibial osteotomy for knee osteoarthritis: A comparison of clinical and radiological outcomes

Table 6 Within-group comparison of preoperative vs post-operative radiographic parameters of joint alignment

	UKA Group				HTO Group
	Pre-op mean (SD)	Post-op mean (SD)	P value1	95%CI	Pre-op mean (SD)	Post-op mean (SD)	P value1	95%CI
Angle of Mikulicz line (°)	0.3 (2.6)	-0.2 (1.8)	0.326	-1.6 to 0.6	0.7 (2.0)	0.2 (1.5)	0.951	-1.5 to 1.6
HKA (°)	174.5 (2.7)	180.2 (3.3)	< 0.001a	4.3 to 7.1	173.9 (4.0)	182.5 (2.8)	< 0.001a	5.2 to 12.0
MAD (%)	23.5 (10.8)	48.9 (13.6)	< 0.001a	20.7 to 30.0	22.3 (14.5)	59.9 (12.0)	< 0.001a	24.2 to 51.0

¹Paired Student’s t-test.

^aP < 0.05, statistically significant.

SD: Standard deviation; UKA: Unicompartmental knee arthroplasty; HTO: High tibial osteotomy; Pre-op: Preoperative; Post-op: Postoperative; HKA: Hip knee ankle angle; MAD: Mechanical axis deviation.