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[Meniscus transplantation--animal experiment study]
K A Milachowski1, K Weismeier, W Erhardt
1Orthopädische Klinik, LMU München, Klinikum Grosshadern.
Abstract:
The possibility of repairing meniscus lesions by transplantation was studied in 30 sheep. Grafting of the meniscus was performed in 15 animals each either with lyophilised homologous menisci that had been sterilised by gamma rays, or with deep frozen homologous menisci. 27 menisci could be evaluated over a period of 48 weeks. Besides the clinical, microscopical and scanning electron microscopical evaluation, the grafts were also examined microangiographically and biomechanically. Both lyophilised and deep-freeze menisci are suitable for transplantation, but the processes of transformation of the grafts are significantly different: Whereas complete transformation takes place in the lyophilised transplant during the study period of 48 weeks, the deep-frozen transplant is accepted and heals without any remarkable transformation process to full function. Although the biomechanical stress tests yielded good stress tolerance for both types of transplants, the deep frozen homologous menisci appear to be more favourable with regard to possible clinical aspects since they do not undergo any transformation.
Insights
Homologous meniscus transplantation in sheep showed both lyophilized and deep-frozen grafts are viable. Deep-frozen grafts are preferred clinically due to acceptance without significant transformation.
Area of Science:
- Veterinary Medicine
- Biomaterials Science
- Orthopedic Surgery
Background:
- Meniscus lesions are common injuries that can lead to long-term knee dysfunction.
- Current treatments for meniscus tears have limitations, prompting research into regenerative strategies.
- Meniscus transplantation offers a potential solution for restoring knee function.
Purpose of the Study:
- To evaluate the efficacy of homologous meniscus transplantation for repairing meniscus lesions.
- To compare the outcomes of using lyophilized (gamma-ray sterilized) versus deep-frozen homologous menisci.
- To assess the clinical, histological, and biomechanical properties of transplanted menisci over 48 weeks.
Main Methods:
- 30 sheep underwent meniscus transplantation using either lyophilized or deep-frozen homologous menisci.
- Grafts were evaluated clinically, microscopically, and via scanning electron microscopy.
- Microangiography and biomechanical testing were performed to assess graft integration and function.
Main Results:
- Both lyophilized and deep-frozen grafts were suitable for transplantation.
- Lyophilized grafts underwent complete transformation within 48 weeks.
- Deep-frozen grafts were accepted and healed without significant transformation, maintaining full function.
Conclusions:
- Homologous meniscus transplantation is a viable option for meniscus repair in sheep.
- Deep-frozen menisci demonstrate superior clinical suitability due to their lack of transformation.
- The choice of preservation method (lyophilization vs. deep-freezing) significantly impacts graft behavior and integration.