Lateral center-edge angle on conventional radiography and computed tomography.
BACKGROUND
Lateral center-edge angle (LCEA), originally described and validated on AP radiographs, has been used increasingly in CT-based studies, but it is unclear whether the measure is reliable and whether it correlates with that on AP radiographs.


OBJECTIVE
We therefore determined: (1) the interobserver and intraobserver reliabilities of the LCEA measured on AP radiographs; (2) the interobserver and intraobserver reliabilities of the LCEA measured on CT scans; and (3) the intermodality correlation of the LCEA between CT and AP radiography.


METHODS
We reviewed the AP radiographs and CT scans of 22 patients treated for slipped capital femoral epiphyses. CT scans were reoriented to a neutral pelvic tilt and inclination. Three evaluators measured the LCEA on the unaffected hip on the AP and CT coronal images that corresponded to the center of the acetabulum on the axial slice.


RESULTS
We found an interobserver intraclass correlation (ICC) analysis of 0.84 for the AP radiographs and 0.88 for the CT scans. The intraobserver ICC for the AP radiographs was 0.96, and for the CT scans 0.98. The intermodality ICC for the CT scans and AP radiographs was 0.79, with a lower bound of 0.61 and an upper bound of 0.87.


CONCLUSIONS
Our data suggest the LCEA measured on a CT scan is reliable and correlates with the LCEA on AP radiographs.
Department of Orthopedic Surgery, Rady Children's Hospital and Health Center, San Diego, CA 92123, USA.
Shafagh
S
Monazzam
James D
JD
Bomar
Krishna
K
Cidambi
Peter
P
Kruk
Harish
H
Hosalkar
D000077:Acetabulum / Q000000981:diagnostic imaging*; D000293:Adolescent; D002648:Child; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging*; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D015588:Observer Variation; D011237:Predictive Value of Tests; D015203:Reproducibility of Results; D060048:Slipped Capital Femoral Epiphyses / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed