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Relationship Between the Lateral Center-Edge Angle and 3-Dimensional Acetabular Coverage.

James D Wylie1, Ashley L Kapron2, Christopher L Peters2

  • 1Department of Orthopedic Surgery, University of Connecticut, Farmington, Connecticut, USA.

Orthopaedic Journal of Sports Medicine
|April 29, 2017
PubMed
Summary
This summary is machine-generated.

The lateral center-edge angle (LCEA) measurement differs between the bone-edge and sourcil-edge on radiographs. The sourcil-edge LCEA indicates anterosuperior coverage, while the bone-edge LCEA indicates superior/lateral coverage, crucial for hip surgery planning.

Keywords:
femoroacetabular impingementhip dysplasiahip preservationlateral center-edge angle

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Hip biomechanics

Background:

  • The lateral center-edge angle (LCEA) is vital for assessing acetabular morphology.
  • Varied interpretations of LCEA and its 3D relationship can lead to misdiagnosis and suboptimal outcomes.

Purpose of the Study:

  • To quantify the discrepancy between bone-edge and sourcil-edge LCEA measurements on anteroposterior (AP) radiographs.
  • To ascertain the precise 3D anatomical positions of these LCEA measurements.

Main Methods:

  • A cohort study involving 60 symptomatic hips analyzed LCEA on AP radiographs and computed tomography (CT).
  • CT was used to identify sagittal clockface locations corresponding to AP radiographic LCEA measurements.
  • Paired t-tests and intraclass correlation coefficients (ICCs) assessed differences and repeatability.

Main Results:

  • Radiographic bone-edge LCEA was significantly greater than sourcil-edge LCEA (mean difference 4.7°, P < .001).
  • On CT, sourcil-edge LCEA was located more anteriorly (1:03) than the bone-edge LCEA (12:06, P < .001).
  • Significant anterior displacement of sourcil-edge LCEA was noted, especially when measurement differences exceeded 5°.

Conclusions:

  • Sourcil-edge LCEA reflects anterosuperior acetabular coverage, whereas bone-edge LCEA reflects superior/lateral coverage.
  • These distinct representations are valuable for preoperative assessment and surgical planning in hip preservation procedures.