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Observations on massive retrieved human allografts.

W F Enneking1, E R Mindell

  • 1University of Florida Health Center, Gainesville.

The Journal of Bone and Joint Surgery. American Volume
|September 1, 1991
PubMed
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Large frozen human allografts slowly integrate with host bone, primarily through external callus formation. Deep graft portions remain unrepaired, suggesting osteoconductive properties rather than osteoinductive ones.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Histopathology

Background:

  • Massive human allografts are used in reconstructive surgery.
  • Understanding their long-term integration and repair is crucial for clinical success.

Purpose of the Study:

  • To evaluate the radiographic and histological integration of retrieved massive human allografts.
  • To assess the host-graft union, internal repair, and cartilage viability over time.

Main Methods:

  • Radiographic and histological analysis of sixteen retrieved massive human allografts.
  • Grafts were in situ for 4 to 65 months.
  • Evaluation of bone union, soft tissue attachment, and cartilage status.

Main Results:

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  • Cortical-cortical union occurred slowly via external callus; cancellous-cancellous union was faster via internal callus.
  • Internal graft repair was minimal (20% by 5 years), with deep portions retaining architecture.
  • Host soft tissues attached via new bone deposition; necrotic cartilage functioned up to 5 years.
  • No resorption or loosening observed with cement fixation; rejection led to inflammatory tissue envelopes.

Conclusions:

  • Massive frozen allografts are primarily osteoconductive, facilitating host bone integration.
  • Slow internal repair and retained architecture suggest limited osteoinductive capacity.
  • Necrotic cartilage can function temporarily, eventually being replaced by reparative tissue.