Canine atlantoaxial optimal safe implantation corridors – description and validation of a novel 3D presurgical planning method using OsiriX™

Table 4 Concordance analyses estimating the reproducibility and error generated by OAB landmark placements

Angle	Value 1	Value 2	n	R²	ρ_c	Low TL	Up TL	Low CI	Up CI	Bias (°)	P-value
ProjA	GS	Single value	1104	0.9970	0.9985	−1.62	1.61	−0.05	0.04	−0.006	0.801
	GS	Mean 2 Obs	552	0.9992	0.9996	−0.83	0.83	−0.04	0.03	−0.003	0.861
	Obs1	Obs2	552	0.9912	0.9956	−2.85	2.79	−0.15	0.08	−0.032	0.579
	Obs1-Sag	Obs2-Sag	264	0.9909	0.9955	−3.37	3.25	−0.25	0.13	−0.060	0.533
	Obs1-Tr	Obs2-Tr	144	0.9815	0.9905	−2.02	2.27	−0.04	0.29	0.123	0.135
	Obs1-Dors	Obs2-Dors	144	0.9844	0.9921	−2.96	2.69	−0.35	0.08	−0.137	0.207
	Obs1-C1	Obs2-C1	192	0.9621	0.9808	−3.58	3.72	−0.17	0.32	0.074	0.549
	Obs1-C2	Obs2-C2	360	0.5493	0.9976	−2.48	2.31	−0.21	0.03	−0.089	0.142
	GS	Mean 2 Rep	552	0.9984	0.9992	−1.18	1.18	−0.05	0.05	−0.001	0.957
	Rep1	Rep2	552	0.9943	0.9971	−2.33	2.20	−0.16	0.03	−0.065	0.163
	Rep1-Sag	Rep2-Sag	264	0.9941	0.9970	−2.77	2.58	−0.25	0.06	−0.098	0.211
	Rep1-Tr	Rep2-Tr	144	0.9846	0.9922	−1.97	1.95	−0.16	0.14	−0.008	0.916
	Rep1-Dors	Rep2-Dors	144	0.9918	0.9959	−2.11	1.98	−0.22	0.09	−0.063	0.421
	Rep1-C1	Rep2-C1	192	0.9795	0.9890	−2.92	2.56	−0.36	0.00	−0.179	0.054
	Rep1-C2	Rep2-C2	360	0.9965	0.9983	−2.06	2.05	−0.11	0.10	0.930^a	−0.005

Bold font: most clinically relevant concordance analyses including comparisons with GS and widest tolerance limit intervals
n number of measures compared, R ² correlation coefficient, ρ _c concordance coefficient, TL 95 % tolerance interval limit (in degrees), CI 95 % confidence interval limits (in degrees), GS gold standard (mean of 4 values), Obs observer, Rep repeat, Sag sagittal ProjA, Tr transverse ProjA, Dors dorsal ProjA, C1 angle projected in C1 system, C2 angle projected in C2 system
^astatistically significant bias (considered clinically non-significant)

ISSN: 1746-6148