Single-center experience with Knee+™ augmented reality navigation system in primary total knee arthroplasty

Table 3 Concordance correlation coefficient (95%CI) and 95% Limits of agreement of expected values with controlled values and radiographic measurements

	Mean (SD)	CCC (95%CI)	95% LOA	Number of differences out of the LOA
Femur
Varus (degrees)
Controlled values	-0.20 (0.61)	0.25 (-0.06, 0.56)	(-1.40, 1.00)	3
Radiographic measures	0.00 (0.00)	1.00 (1.00, 1.00)	-	-
Flexion (degrees)
Controlled values	0.03 (0.56)	0.83 (0.71, 0.94)	(-1.06, 1.10)	0
Radiographic measures	0.33 (0.61)	0.66 (0.48, 0.84)	(-0.86, 1.52)	2
Tibia
Varus (degrees)
Controlled values	-0.23 (0.50)	0.31 (0.06, 0.56)	(-1.22, 0.76)	1
Radiographic measures	0.10 (0.31)	-	(-0.50, 0.70)	3
Posterior slope (degrees)
Controlled values	-0.22 (0.63)	0.75 (0.59, 0.91)	(-1.46, 0.99)	3
Radiographic measures	0.03 (0.41)	0.89 (0.82, 0.95)	(-0.78, 0.84)	5

CCC: Concordance correlation coefficient; LOA: Limits of agreement.