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[An experimental comparative study of hydroxyapatite and tricalcium-phosphate as bone substitutes]
1Department of Orthopedic Surgery, Kyorin University, School of Medicine, Tokyo, Japan.
Nihon Seikeigeka Gakkai Zasshi
|October 1, 1989
Summary
Beta tricalcium-phosphate (TCP) and hydroxyapatite (HAP) bone grafts showed no significant changes over two years in canine femoral implants. TCP is a promising option to extend autograft use in bone regeneration.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Regenerative Medicine
Background:
- Hydroxyapatite (HAP) and beta tricalcium-phosphate (TCP) are widely used synthetic bone graft materials.
- Evaluating the long-term stability and bone regeneration potential of these materials is crucial for clinical applications.
Purpose of the Study:
- To compare the radiological, macroscopic, and histological changes of HAP and TCP implants in a canine femoral defect model over two years.
- To assess the potential of TCP as an autograft extender.
Main Methods:
- HAP and TCP were implanted into the distal metaphysis of 18 mongrel dogs.
- Radiological assessments were performed periodically post-surgery.
- Animals were sacrificed at various time points (2 weeks to 2 years) for macroscopic and histological examination of undecalcified specimens using Cole HE stain.
Main Results:
- Both HAP and TCP implants showed no significant radiological or macroscopic changes over the 2-year study period.
- Histological analysis revealed configuration changes in TCP but no difference in new bone formation between HAP and TCP implants.
- The calcium-to-phosphorus (Ca/P) ratios of both implants remained constant at 2 years.
Conclusions:
- TCP demonstrates stability and comparable new bone formation to HAP in a canine femoral model.
- The findings suggest that TCP is a viable and promising material for extending the use of autografts in orthopedic procedures.
- Further research may explore TCP's efficacy in different clinical scenarios.