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Allograft reconstruction in total knee arthroplasty
I Stockley1, J P McAuley, A E Gross
1Mount Sinai Hospital, Toronto, Ontario, Canada.
Summary
Deep-frozen irradiated allografts successfully reconstructed bone defects in 20 knees, achieving union in all cases. This method reduced the need for complex prostheses, despite some graft fractures and infections.
Area of Science:
- Orthopedic surgery
- Biomaterials science
- Musculoskeletal research
Background:
- Bone defects pose significant challenges in orthopedic reconstruction.
- Allografts offer a potential solution for large bone defect repair.
- Deep-frozen irradiated allografts are utilized to preserve structural integrity and minimize immunogenicity.
Purpose of the Study:
- To evaluate the efficacy of deep-frozen irradiated allografts in reconstructing bone defects around the knee.
- To assess the union rates, complications, and functional outcomes of allograft use.
- To determine if allografts can reduce the reliance on custom-made or constrained prostheses.
Main Methods:
- A retrospective review of 32 deep-frozen irradiated allografts used in 20 knee reconstructions.
- Classification of allografts into bulk, cortical strut, and morsellised types.
- Radiographic assessment of allograft-host union and clinical follow-up for an average of 4.2 years.
Main Results:
- Complete radiographic union of the allograft to the host bone was observed in all 20 cases.
- Two allografts experienced subsequent fractures, and three knees required revision surgery due to infection.
- Allografts effectively filled large bone defects, demonstrating their utility in complex knee reconstructions.
Conclusions:
- Deep-frozen irradiated allografts are a viable option for reconstructing significant bone defects in the knee.
- This technique can decrease the necessity for custom-made and constrained prosthetic implants.
- Careful patient selection and management are important to mitigate risks of graft fracture and infection.