Intra- and interobserver reliability analysis of pediatric lower limb parameters on digital long leg radiographs

Table 4 Standard values and the accepted range of each lower limb parameter [12, 18], interobserver-ICC_2,1, Standard Error of Measurement (SEM) and proportional error

Measures	Standard value	Accepted range	Interobserver-ICC_2,1	SEM_95%	SEM_95%Range	Proportional error in %
MFA (°)	1.3 ± 3	6	0.949 (0.859–0.975)	± 1.39	2.78	46.33
MAD (mm)	8 ± 7	14	0.976 (0.966–0.983)	± 3.31	6.62	47.29
mLPFA (°)	90 ± 5	10	0.974 (0.964–0.981)	± 1.69	3.38	33.80
mLDFA (°)	88 ± 2.5	5	0.969 (0.954–0.979)	± 1.06	2.12	42.40
mMPTA (°)	87 ± 2.5	5	0.864 (0.816–0.901)	± 1.29	2.58	51.60
mLDTA (°)	89 ± 3	6	0.876 (0.831–0.909)	± 2.17	4.34	72.33
JLCA (°)	1 ± 1	2	0.488 (0.350–0.605)	± 1.38	2.76	138.00
Femur length (mm)	N/A	N/A	0.996 (0.994–0.997)	± 4.53	N/A	N/A
Tibia length (mm)	N/A	N/A	0.994 (0.990–0.998)	± 3.12	N/A	N/A

Interobserver-ICC_2,1 (95% confidence interval in parenthesis) with Standard Error of Measurement (SEM) with a 95% confidence interval. For interobserver-ICC_2,1 first measurement results of observer 1 were compared with first measurement results of observer 2
MFA Mechanical Femorotibial Angle; MAD Mechanical Axis Deviation; mLPFA mechanical Lateral Proximal Femur Angle; mLDFA mechanical Lateral Distal Femur Angle; mMPTA mechanical Medial Proximal Tibia Angle; mLDTA mechanical Lateral Distal Tibia Angle; JLCA Joint Line Convergence Angle, length of the femur and tibia
For values of femur length and tibia length there are no standard values and therefore no accepted ranges, SEM_95%Range or proportional errors are not applicable (N/A)

ISSN: 1749-799X