Acetabular component thickness does not affect mid-term clinical results in hip resurfacing
Mariam Al-Hamad1, Michel J Le Duff, Karren M Takamura
1Joint Replacement Institute, 2200 West Third Street, Suite 400, Los Angeles, CA, 90057, USA.
Clinical Orthopaedics and Related Research
|January 23, 2014
Summary
The 3.5-mm acetabular component in hip resurfacing shows comparable mid-term results to the 5-mm shell, with fewer complications. This study supports the use of thinner components for bone conservation without compromising outcomes.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
Background:
- Thin acetabular components in hip resurfacing offer bone conservation benefits.
- Limited mid-term clinical data exist for these thinner devices.
Purpose of the Study:
- To evaluate mid-term clinical outcomes of 3.5-mm versus 5-mm acetabular shells in hip resurfacing.
- To compare complication rates, survivorship, radiographic appearance, and metal ion levels between the two component thicknesses.
Main Methods:
- Retrospective comparative study of 504 patients undergoing hip resurfacing.
- Comparison of 281 patients with 5-mm shells and 223 patients with 3.5-mm shells.
- Analysis of clinical scores, complications, survivorship, radiographic results, and metal ion levels.
Main Results:
- Similar mid-term UCLA hip scores (pain, walking, function, activity) between the 3.5-mm and 5-mm groups.
- Higher complication rates observed in the 5-mm group (6.4%) compared to the 3.5-mm group (1.8%).
- Comparable survivorship, cup radiolucency at 5 years, and metal ion levels (cobalt, chromium) between groups.
Conclusions:
- The 3.5-mm acetabular component demonstrates comparable mid-term clinical results to the 5-mm shell.
- There is no significant clinical disadvantage to using the thinner 3.5-mm acetabular component.
- The findings support the use of 3.5-mm shells for bone conservation in hip resurfacing.
