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Related Experiment Videos

Comparison between Constrained and Semiconstrained Knee Allograft-Prosthesis Composite Reconstructions.

German L Farfalli1, Luis A Aponte-Tinao, Miguel A Ayerza

  • 1Department of Surgery, Orthopaedic Surgery Service, Memorial Sloan-Kettering Cancer Center, Weill Cornell Medical College, Cornell University, New York, NY, USA ; Institute of Orthopedics "Carlos E. Ottolenghi," Italian Hospital of Buenos Aires, Buenos Aires, Argentina.

Sarcoma
|March 12, 2013
PubMed
Summary

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Allograft-prosthesis composite (APC) reconstruction can restore knee stability after tumor surgery. While both constrained and non-constrained prostheses showed similar outcomes, APC fractures were linked to short prosthetic stems.

Area of Science:

  • Orthopedic Surgery
  • Oncology
  • Biomaterials Science

Background:

  • Allograft-prosthesis composite (APC) is utilized to reconstruct knee tissues lost during tumor extirpation.
  • Restoring knee stability and preventing aseptic loosening are critical challenges in APC procedures.

Purpose of the Study:

  • To evaluate the efficacy of APC in restoring knee stability and function.
  • To compare outcomes between non-constrained and constrained prostheses in APC procedures.
  • To identify factors associated with complications such as aseptic loosening and allograft fractures.

Main Methods:

  • Retrospective comparison of 50 knee APCs with non-constrained prostheses (Group 1) and 36 APCs with constrained prostheses (Group 2).
  • Analysis of survival rates, complication rates (infections, fractures, instability, loosening), and functional outcomes (MSTS scores).

Related Experiment Videos

  • Investigation of the relationship between prosthetic stem length and allograft fractures.

    • Main Results:

    • Survival rates at 10 years were 62% for non-constrained and 53% for constrained prostheses.
    • Complications included deep infections, fractures, instability, aseptic loosening, local recurrence, and nonunion in both groups.
    • Allograft fractures were more frequent when the prosthetic stem did not bypass the host-donor osteotomy (P > 0.05).
    • Functional results (MSTS) were generally good or excellent in both groups.
    • No significant difference in survival rates, functional scores, or aseptic loosening between the groups.

    Conclusions:

    • APC can restore knee stability and function, with comparable outcomes between constrained and non-constrained prostheses.
    • A rotating-hinge APC is recommended for instability when soft tissue reconstruction is insufficient.
    • Short prosthetic stems are associated with an increased risk of APC fractures.