Clinical Orthopaedics and Related Research®

, Volume 471, Issue 7, pp 2233–2237 | Cite as

Lateral Center-edge Angle on Conventional Radiography and Computed Tomography

  • Shafagh Monazzam
  • James D. Bomar
  • Krishna Cidambi
  • Peter Kruk
  • Harish Hosalkar
Basic Research



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.


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.


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.


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.


Our data suggest the LCEA measured on a CT scan is reliable and correlates with the LCEA on AP radiographs.


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Copyright information

© The Association of Bone and Joint Surgeons® 2012

Authors and Affiliations

  • Shafagh Monazzam
    • 1
  • James D. Bomar
    • 1
  • Krishna Cidambi
    • 1
  • Peter Kruk
    • 2
  • Harish Hosalkar
    • 1
  1. 1.Department of Orthopedic SurgeryRady Children’s Hospital and Health CenterSan DiegoUSA
  2. 2.Department of RadiologyRady Children’s Hospital and Health CenterSan DiegoUSA

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