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Are Radiographic and Direct Measures of Acetabular Polyethylene Wear Comparable?
Krista K Parran1, Christopher P Bechtel2, Rebecca D Moore1
1Department of Orthopaedics, Case Western Reserve University School of Medicine, Cleveland, OH.
The Journal of Arthroplasty
|April 24, 2018
Summary
Direct measurements of polyethylene acetabular liner wear correlate well with the computerized Hip Analysis Suite (HAS) method, especially when comparing maximum wear. A single prerevision radiograph is sufficient for assessing in vivo wear.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Medical imaging analysis
Background:
- Polyethylene acetabular liners in hip implants are prone to wear over time.
- Various methods exist for calculating linear wear rates, necessitating validation.
Purpose of the Study:
- To compare 2-dimensional wear rates derived from direct micrometer measurements against those from the computerized Hip Analysis Suite (HAS) edge-detection method.
- To validate the accuracy of HAS in assessing polyethylene wear in retrieved acetabular liners.
Main Methods:
- Evaluated two groups of retrieved acetabular liners (n=18 and n=55) from Harris-Galante Prosthesis implants with over 10 years in situ.
- Calculated average and maximum direct linear wear using a digital micrometer at six locations.
- Utilized HAS 8.0.4.3 to compute 2-dimensional wear from anteroposterior pelvic radiographs.
Main Results:
- HAS-calculated aggregate wear rates were significantly higher than average direct measurements for both groups (P = .020 and P < .001).
- No significant difference was found when comparing maximum direct micrometer measurements to HAS for either group (P = .351 and P = .451).
- Strong linear correlation was observed between HAS and both average and maximum direct wear measures, with maximum wear showing closer correspondence to HAS.
Conclusions:
- This study is the first to compare and validate 2-dimensional wear rates using direct measurements from retrieved components against a radiographic computer-assisted technique.
- Wear rates determined by direct measurements are consistent with computer-assisted 2-dimensional methods, particularly for maximum wear.
- A single prerevision radiograph is adequate for assessing 2-dimensional in vivo wear of acetabular liners.
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