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Direct Mouse Trauma/Burn Model of Heterotopic Ossification
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Computed Tomography Versus Simple Radiography for Detecting and Classifying Heterotopic Ossification after Reverse

Tae Kang Lim1, Yun Sun Choi2, Gu Min Jeong1

  • 1Department of Orthopedic Surgery, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, Korea.

Clinics in Orthopedic Surgery
|December 2, 2024
PubMed
Summary

Computed tomography (CT) offers improved reliability over simple radiography for detecting and classifying heterotopic ossification (HO) after reverse shoulder arthroplasty (RSA), correlating better with clinical outcomes.

Keywords:
AcetubulumComplicationFractureOutcomePrognostic factor

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Medical Imaging

Background:

  • Heterotopic ossification (HO) following reverse shoulder arthroplasty (RSA) presents challenges in radiographic characterization.
  • Evaluating the reliability of simple radiography versus computed tomography (CT) for HO assessment is crucial.

Purpose of the Study:

  • To compare the intraobserver and interobserver reliability of simple radiography and CT in detecting and classifying HO after RSA.
  • To analyze the correlation between HO identified via radiography/CT and clinical outcomes.

Main Methods:

  • Retrospective review of 30 patients who underwent RSA, with immediate and 1-year postoperative radiographs and CT scans.
  • Intraobserver and interobserver reliability assessed using Kappa statistics for HO detection and Modified Brooker's classification.
  • Correlation analysis between radiographic findings and clinical scores (UCLA, SF-36).

Main Results:

  • Both radiography and CT demonstrated excellent intraobserver reliability for HO detection and classification.
  • CT significantly improved interobserver reliability for HO detection (Kappa: 0.8316 vs. 0.6018) and classification (0.6964 vs. 0.5300) compared to radiography.
  • HO detected by CT, but not radiography, correlated with lower UCLA and SF-36 physical scores.

Conclusions:

  • Simple radiography and CT offer high intraobserver reliability for HO assessment post-RSA.
  • CT enhances interobserver reliability and provides clearer definition of HO presence and severity compared to simple radiography.
  • CT-based HO assessment is more strongly associated with diminished clinical outcomes after RSA.