Assessing wear of the acetabular cup using computed tomography: an ex vivo study
| Autor: | Henrik Olivecrona, Lotta Olivecrona, Anneli Jedenmalm, Peter Aspelin, Gerald Q. Maguire Jr., Michael P. Zeleznik, Lars Weidenhielm, Marilyn E. Noz |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
medicine.medical_specialty
Computed tomography Femoral head Imaging Three-Dimensional medicine Humans Radiology Nuclear Medicine and imaging Femoral component Spiral Device Removal Radiological and Ultrasound Technology medicine.diagnostic_test business.industry Reproducibility of Results General Medicine Acetabulum Surgery Prosthesis Failure Equipment Failure Analysis medicine.anatomical_structure Polyethylene Feasibility Studies Hip Prosthesis Nuclear medicine business Tomography X-Ray Computed Wear measurement Ex vivo Ct measurements |
| Zdroj: | Acta radiologica (Stockholm, Sweden : 1987). 46(8) |
| ISSN: | 0284-1851 |
| Popis: | Purpose: To validate a clinically useful method for measuring acetabular cup wear using computed tomography (CT). Material and Methods: Eight uncemented acetabular cups were scanned twice ex vivo using CT. The linear penetration depth of the femoral component head into the cup and the thickness of the remaining polyethylene liner were measured in the CT volumes using dedicated software. Two independent examiners twice assessed each volume. The CT measurements were compared to direct measurements using a coordinate measuring device and micrometer measurements. Results: Accuracy of wear measurements expressed as penetration depth was ±0.6 and ±1.0 mm for the two examiners, respectively, with no significant differences between examiners, trials, and CT scans. Accuracy of measurements of remaining polyethylene was ±1.3 and ±1.0 mm, respectively, for the two examiners. Systematic differences between examiners were found, but no significant differences between trials and CT scans. These differences were due to different interpretations of metal artifacts in the volumes. Conclusion: The proposed CT method for evaluating wear as head penetration depth allows for reliable wear detection at a clinically relevant level. Measurements of remaining polyethylene on CT volumes are not as reliable as wear measurements owing to metal artifacts. |
| Databáze: | OpenAIRE |
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