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Orthopaedic applications of hydroxyapatite.

¹Department of Orthopaedic Surgery, Osaka-Minami National Hospital, Japan.

|March 1, 1991

Summary

Hydroxyapatite (HA) offers significant advantages in orthopaedics, including no immune reactions and stable volume for bone defect filling. Its use in implants and coatings enhances cementless fixation and bone cementation, improving surgical outcomes.

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Area of Science:

Biomaterials Science
Orthopaedic Surgery
Medical Device Engineering

Background:

Hydroxyapatite (HA) has a history of use exceeding six years in medical applications.
Recent advancements focus on HA composites for clinical orthopaedics, specifically for bone defect management.

Observation:

HA exhibits desirable properties such as a lack of immuno-reaction and stable postoperative morphology.
HA implants, when fixed with cement, mitigate issues associated with high-density polyethylene wear particles.
HA is utilized in total hip replacements as femoral plugs and as a coating for cementless fixation of metal components.

Findings:

Porous metal surfaces with HA coating demonstrate improved results for rapid and strong cementless fixation.
A novel technique involves bioactive interfacial bone cementation using fine HA granules between bone and polymethyl methacrylate (PMMA) cement.

Implications:

HA composites present a viable solution for bone defect filling and spacing in orthopaedic procedures.
HA integration in implants and coatings enhances the longevity and performance of orthopaedic devices.
Bioactive interfacial bone cementation with HA granules shows promise for improved bone-implant integration.

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