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Heat generated by hip resurfacing prostheses: an in vivo pilot study
1Orthopedics International, 168 Lake Washington Blvd. East, Seattle, WA, USA. bonerecon@aol.com
Journal of Long-Term Effects of Medical Implants
|June 14, 2011
Summary
Hip resurfacing generates significant heat, with metal-on-metal prostheses producing the most. This increased temperature may lead to wear and long-term complications like loosening.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Biomedical Engineering
Background:
- Hip resurfacing arthroplasty is an alternative to total hip replacement.
- Understanding the thermal effects of different bearing surfaces is crucial for long-term implant survival.
Purpose of the Study:
- To quantify temperature increases in resurfaced hips using various component materials.
- To compare heat generation between different hip resurfacing bearing couples.
Main Methods:
- Percutaneous temperature sensors were implanted in 12 patients with resurfaced hips.
- Temperature recordings were taken at rest and after 20 and 60 minutes of walking.
- Data was collected for 9 different acetabular bearing surface components used in hip resurfacing.
Main Results:
- Resurfaced hips generate more heat than normal or arthritic hips.
- Metal-on-metal (cobalt-chromium) prostheses showed the highest temperature increase (8°C) after 60 minutes of walking.
- Ceramic on poly-ether-ether-ketone (PEEK) or polyurethane generated less heat (4-5°C) compared to metal-on-metal or metal-on-polyethylene designs.
Conclusions:
- Hip resurfacing components generate significant frictional heat, which is not readily dissipated.
- Elevated intra-articular temperatures may accelerate bearing surface wear.
- Prolonged high temperatures could potentially impact periarticular cell growth and lead to bone resorption or component loosening.
