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Classification of heterotopic ossification (HO) in artificial disk replacement
Paul C McAfee1, Bryan W Cunningham, John Devine
1Scoliosis and Spine Center, St Joseph Hospital, Baltimore, Maryland 21204, USA. mack8132@aol.com
Journal of Spinal Disorders & Techniques
|August 7, 2003
Summary
A new classification system for heterotopic bone formation after artificial disk replacement was developed. This method is highly reliable and reproducible for quantifying ectopic bone and periannular calcification.
Area of Science:
- Orthopedic Surgery
- Radiology
- Biomedical Engineering
Background:
- Lack of a standardized system to quantify heterotopic bone formation post-artificial disk replacement.
- Heterotopic ossification (HO) is a common complication affecting outcomes.
Purpose of the Study:
- To develop a reliable and reproducible classification system for heterotopic bone formation after total disk arthroplasty (TDA).
- To create a simple, memorable system with five severity gradations.
Main Methods:
- Classification of 101 clinical radiographs and 17 nonhuman primate microradiographs from patients undergoing TDA.
- Seven independent reviewers with varying expertise assessed the images.
- Interobserver and intraobserver reliability were evaluated using kappa statistics and intraclass correlation coefficients.
Main Results:
- High interobserver reliability was achieved (r = 0.9683, P < 0.0001).
- Excellent intraobserver reliability was demonstrated (r = 0.8949, P = 0.01).
- The classification system proved effective for grading periannular calcification and ectopic bone formation.
Conclusions:
- The developed classification system for heterotopic ossification following TDA is highly reliable and reproducible.
- This system facilitates consistent assessment of bone formation by different investigators.
- It provides a valuable tool for research and clinical evaluation of TDA outcomes.