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Skeletal extension development: criteria for future designs.

C W Hall, P A Cox, W A Mallow

    Bulletin of Prosthetics Research
    |January 1, 1976
    PubMed
    Summary
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    Supracortical skeletal extensions showed fewer bone complications than intramedullary rods in goat models. This study reviews artificial tendon devices for ankle joint control, highlighting supracortical designs for better tissue integration.

    Area of Science:

    • Biomaterials Science
    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Skeletal extensions aim to integrate external devices with bone for enhanced function.
    • Artificial tendons are being developed to restore joint mobility by connecting to existing musculature.
    • Evaluating new orthopedic devices requires rigorous preclinical testing in relevant animal models.

    Purpose of the Study:

    • To compare the efficacy and safety of intramedullary and supracortical skeletal extension devices.
    • To assess the tissue response and complication rates associated with novel orthopedic implants.
    • To evaluate the potential of an artificial tendon system for ankle joint reconstruction.

    Main Methods:

    • Review of existing intramedullary and supracortical skeletal extension devices.

    Related Experiment Videos

  • Description of an artificial tendon system for ankle joint control.
  • Surgical implantation and evaluation of devices in 52 goats.
  • Histological and clinical assessment of bone-implant interface and soft tissues.

    • Main Results:

    • Supracortical devices demonstrated a lower incidence of bone necrosis and osteomyelitis (1 case) compared to intramedullary rods (5 cases).
    • Both device types showed comparable performance regarding time in situ.
    • Cone-shaped supracortical devices exhibited vulnerability to extension forces.

    Conclusions:

    • Supracortical skeletal extension devices appear to offer a safer alternative to intramedullary rods, with reduced bone complications.
    • Further development of supracortical designs is warranted, potentially addressing vulnerability to specific mechanical forces.
    • The goat model proved suitable for evaluating the biocompatibility and surgical outcomes of these orthopedic innovations.