The influence of computer-assisted surgery experience on the accuracy and precision of the postoperative mechanical axis during computer-assisted lateral closing-wedge high tibial osteotomy

Table 2 Comparison of navigation and radiographic measurements between early and late cohorts of computer-assisted, lateral closing-wedge high tibial osteotomy

		Early cohort	Late cohort	P value
Navigation
Mechanical axis (°)^a	Preoperative	Varus 8.4 ± 2.7	Varus 9.0 ± 3.2	0.204
Mechanical axis (°)^a	Postoperative	Valgus 3.4 ± 1.4	Valgus 3.4 ± 1.4	0.894
Mechanical axis % (%)^b	Postoperative	62.1 ± 5.8	61.0 ± 6.5	0.140
Radiograph
Mechanical axis (°)^a	Preoperative	Varus 7.3 ± 3.1	Varus 8.3 ± 3.0	0.078
Mechanical axis (°)^a	Postoperative	Valgus 1.0 ± 2.9	Valgus 2.2 ± 1.7	0.003
Mechanical axis % (%)^b	Preoperative	14.8 ± 11.9	10.8 ± 14.3	0.079
Mechanical axis % (%)^b	Postoperative	55.5 ± 11.5	60.8 ± 8.3	0.138
Tibial posterior slope angle	Preoperative	10.2 ± 2.1	10.1 ± 2.3	0.764
Tibial posterior slope angle	Postoperative	8.3 ± 2.2	8.4 ± 2.3	0.694
Change in tibial posterior slope angle		−1.9 ± 0.7	−1.7 ± 1.0	0.084

^aMechanical axis, angle between the femoral and tibial mechanical axis; negative values indicate varus angles; ^bmechanical axis %, percentile denotation ([b/a] × 100) of the point at which the mechanical axis of the lower extremity intersected the line extending from the medial border to the lateral border of the tibial plateau on orthoroentgenogram
Significant values are shown in bold typeface; P < 0.05

ISSN: 2234-2451