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The Use of Mixed Reality in Custom-Made Revision Hip Arthroplasty: A First Case Report
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Measuring acetabular component version after THA: CT or plain radiograph?

Benjamin McArthur1, Michael Cross, Christina Geatrakas

  • 1Hospital for Special Surgery, 535 E. 70th Street, New York, NY 10021, USA. mcarthurb@hss.edu

Clinical Orthopaedics and Related Research
|March 8, 2012
PubMed
Summary
This summary is machine-generated.

Properly positioned cross-table lateral radiographs provide accurate acetabular component version measurements after total hip arthroplasty (THA), similar to CT scans. Plain radiographs are a reliable option for these crucial THA measurements.

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Area of Science:

  • Orthopedic surgery
  • Radiology
  • Medical imaging analysis

Background:

  • Cross-table lateral radiographs are standard for measuring acetabular component version post-total hip arthroplasty (THA).
  • Computed tomography (CT) is suggested as more accurate due to pelvic tilt, rotation, and inclination variations.
  • Limited data suggests CT superiority even with ideal radiograph positioning.

Purpose of the Study:

  • To determine if correctly positioned cross-table lateral radiographs yield accurate acetabular component version measurements.
  • To compare the accuracy and reliability of modified cross-table lateral radiographs against standard radiographs and CT.
  • To assess measurement reliability using two independent observers.

Main Methods:

  • 27 Sawbones pelves with acetabular cups were implanted using computer navigation.
  • CT, AP pelvis view, standard cross-table lateral, and modified cross-table lateral radiographs were obtained.
  • Modified radiographs used a beam angle adjusted for cup inclination from the AP view.
  • Acetabular component version and inclination were measured; reliabilities and correlations with navigation data were calculated.

Main Results:

  • All measurement methods demonstrated high interobserver and intraobserver reliability (>0.95).
  • Correlations with navigated values were strong for all methods (≥0.96).
  • CT showed the highest correlation, but modified and standard cross-table lateral radiographs had similar high correlations.

Conclusions:

  • CT enables accurate acetabular component version measurement.
  • Properly positioned cross-table lateral radiographs offer similarly accurate measurements.
  • Plain radiographs are supported for obtaining essential post-THA measurements.