Table 2 Intra- and Interobserver Reproducibility of the GAA in 20 Patientsa.

From: Defining the Gothic Arch Angle (GAA) as a radiographic diagnostic tool for instability in hip dysplasia

 

Intraobserver reproducibility (Observer 1)

Intraobserver reproducibility (Observer 2)

Interobserver reproducibility

ICC (95% CI)

ICC (95% CI)

ICC (95% CI)

LCEA

0.918 (0.867–0.976)

0.872 (0.832–0.987)

0.910 (0.835–0.965)

AI

0.913 (0.875–0.983)

0.921 (0.876–0.985)

0.916 (0.845–0.975)

FEAR Index

0.994 (0.982–0.999)

0.962 (0.863–0.992)

0.983 (0.893–0.996)

GAA

0.996 (0.994–1.0)

0.995 (0.907–0.994)

0.957 (0.890–0.988)

  1. aAI acetabular index, FEAR index Femoro-Epiphyseal Acetabular Roof, GAA Gothic Arch Angle, ICC intraclass correlation coefficient, LCEA Lateral Center–Edge Angle;
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