Femoral Head Size and Wear of Highly Cross-linked Polyethylene at 5 to 8 Years
| Autor: | Daniel S. Heckman, John M. Martell, Paul F. Lachiewicz, Jimmi Mangla, Elizabeth S. Soileau |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Head size
Adult Male medicine.medical_specialty Time Factors Radiography medicine.medical_treatment Arthroplasty Replacement Hip Population Prosthesis Design Femoral head Coated Materials Biocompatible Clinical Research medicine Humans Orthopedics and Sports Medicine education Aged Retrospective Studies Aged 80 and over Titanium education.field_of_study Cross-linked polyethylene business.industry Femur Head General Medicine Middle Aged Arthroplasty Surgery Prosthesis Failure medicine.anatomical_structure Treatment Outcome Acetabular component Polyethylene Orthopedic surgery Female Hip Joint Hip Prosthesis Stress Mechanical business Nuclear medicine |
| Popis: | Wear of highly cross-linked polyethylene is reportedly independent of head size. To confirm that observation we asked in our population whether head size related to wear with one type of electron beam highly cross-linked polyethylene. Of 146 hips implanted, we evaluated complete clinical and radiographic data for 90 patients (102 hips or 70%). The minimum followup was 5 years (mean, 5.7 years; range, 5–8 years). The head size was selected intraoperatively based on the size of the acetabular component and presumed risk of dislocation. Polyethylene wear measurements were performed in one experienced laboratory using the method of Martell et al. There was no hip with pelvic or femoral osteolysis. The median linear wear rate was 0.028 mm/year (mean, 0.04 mm/year), and the median volumetric wear rate was 25.6 mm3/year (mean, 80.5 mm3/year). Median total volumetric wear was 41.0 mm3 (mean, 98.5 mm3). We found no association between femoral head size and the linear wear rate, but observed an association between larger (36- and 40-mm) head size and volumetric wear rate and total volumetric wear. Although the linear wear rate of polyethylene was not related to femoral head diameter, there was greater volumetric wear (156.6 mm3/year) with the 36- and 40-mm heads. Pending long-term studies of large head sizes, we advise caution in using larger femoral heads in young or active patients and in those with a low risk of dislocation. Level of Evidence: Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence. |
| Databáze: | OpenAIRE |
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