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Wear of bipolar hip prostheses
1Department of Orthopaedic Surgery, Showa University, Fujigaoka Hospital, Yokohama, Kanagawa, Japan.
The Journal of Arthroplasty
|September 19, 1998
Summary
Radiographs revealed significant wear in bipolar hip prostheses, averaging 0.17 mm annually. While osteolysis occurred in 37% of cases, deeper rim abrasion was noted in retrieved prostheses with osteolysis.
Area of Science:
- Orthopedic surgery
- Biomedical engineering
- Materials science
Background:
- Bipolar hip prostheses are used to replace damaged hip joints.
- Assessing wear and osteolysis in these prostheses is crucial for long-term implant survival.
- Previous studies have indicated varying rates of wear and associated complications.
Purpose of the Study:
- To develop and utilize a radiographic method for measuring inner articulation wear in bipolar hip prostheses.
- To quantify the average annual wear rate and assess the incidence of osteolysis.
- To investigate the relationship between wear rate, osteolysis, and retrieved prosthesis characteristics.
Main Methods:
- A novel radiographic technique was employed to visualize the inner articulation of bipolar hip prostheses.
- Wear was measured in 68 patients with a 22 mm inner head diameter.
- 19 retrieved prostheses were analyzed to examine rim abrasion depth.
Main Results:
- The average annual wear rate was measured at 0.17 mm.
- Osteolysis was observed in 37% of the evaluated hips.
- Retrieved prostheses with osteolysis exhibited deeper rim abrasion compared to those without.
Conclusions:
- The wear rate in bipolar hip prostheses is higher than in Charnley's prosthesis.
- Reduced motion range due to linear penetration increases impingement and rim abrasion.
- This wear mechanism may contribute to osteolysis development in bipolar hip implants.