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Hydroxyapatite-coated hip prostheses: difficulties with revision in 4 cases
M S Bhamra1, G S Rao, M J Robson
1Department of Orthopedic and Trauma Surgery, Rotherham General Hospitals (NHS) Trust, U.K.
Acta Orthopaedica Scandinavica
|February 1, 1996
Summary
Hydroxyapatite ceramic (HAC) coated hip implants offer secure fixation but pose revision challenges. Removal of these well-fixed prostheses, necessary for revision surgery, proved difficult in reported cases.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Device Engineering
Background:
- Hydroxyapatite ceramic (HAC) coating was introduced for uncemented hip implants in 1985, significantly improving prosthesis fixation.
- The secure fixation provided by HAC coatings, while beneficial, presents challenges during revision surgeries.
Observation:
- This report details 4 patients requiring revision hip arthroplasty due to persistent pain or infection after HAC-coated prosthesis implantation.
- Two patients received HAC-coated prostheses during revision procedures, and two during primary hip replacements.
Findings:
- The HAC-coated hip prostheses in these cases were found to be exceptionally well-fixed, making them difficult to extract.
- Revision surgery necessitated a transfemoral longitudinal osteotomy in three of the four patients.
Implications:
- The secure osseointegration of HAC coatings, while advantageous for initial fixation, may complicate future revision arthroplasty.
- Surgical techniques, such as osteotomy, may need to be considered for the removal of securely fixed HAC-coated implants.
- Further research into implant design and removal strategies for HAC-coated prostheses is warranted.