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Published on: May 1, 2020
A histological study of retrieved Cambridge acetabular components
Roger A Brooks1, Richard E Field, Eric Jones
1Orthopaedic Research Unit, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK. rb10003@cam.ac.uk
Summary
Hydroxyapatite (HA)-coated acetabular cups promote better bone integration and stability compared to uncoated versions. This coating enhances bone apposition, even after resorption, ensuring reliable long-term fixation for hip implants.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Tissue Engineering
Background:
- The Cambridge cup, an uncemented acetabular component, is designed to improve stability and reduce stress shielding by mimicking subchondral bone.
- Hydroxyapatite (HA) coating is utilized to enhance bone integration with the implant surface.
Purpose of the Study:
- To evaluate the histological and histomorphometric characteristics of HA-coated and uncoated Cambridge cups.
- To assess bone apposition, fibrous tissue formation, and wear debris in retrieved acetabular components.
Main Methods:
- Implantation of Cambridge cups (HA-coated and uncoated) in 50 women with femoral neck fractures.
- Post-mortem retrieval of 12 cups between 2 and 84 months.
- Histological and histomorphometric analysis of retrieved implants and surrounding tissues.
Main Results:
- HA-coated implants demonstrated significantly greater bone apposition and less fibrous tissue compared to uncoated implants.
- Bone and bone marrow were observed adjacent to the implant surface following HA resorption.
- No excessive wear of the ultra-high molecular weight polyethylene liner was observed.
Conclusions:
- Hydroxyapatite (HA) coated acetabular components facilitate reliable osseous attachment.
- HA resorption does not compromise medium-term osseous fixation when used with an appropriate implant surface.
- The flexible carbon polymer of the Cambridge cup appears to maintain stability post-HA resorption.
