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Related Experiment Videos

The Phenix expandable prosthesis: early American experience.

R M Wilkins1, A Soubeiran

  • 1Colorado Limb Consultants and Institute for Limb Preservation, Denver 80218, USA.

Clinical Orthopaedics and Related Research
|January 12, 2001
PubMed
Summary

The Phenix prosthesis offers a promising solution for limb length equalization in children undergoing limb preservation. This expandable prosthesis uses a spring-release mechanism activated by an external field, simplifying lengthening procedures.

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Pediatric oncology

Background:

  • Maintaining leg length equality is a significant challenge in limb preservation for skeletally immature children.
  • Previous expandable prosthesis designs have faced mechanical issues or required extensive surgical intervention for lengthening.

Purpose of the Study:

  • To evaluate the safety and efficacy of the Phenix prosthesis for limb lengthening in pediatric patients.
  • To assess the feasibility of non-operative or minimally invasive lengthening using advanced prosthetic technology.

Main Methods:

  • Seven Phenix prostheses were implanted in six pediatric patients treated for Stage II-B osteosarcoma.
  • The prosthesis utilizes stored spring energy released by an external electromagnetic field for controlled lengthening.

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  • Twenty-one lengthening procedures were performed, with an average of 8 mm increase per session.

    • Main Results:

    • Surgical implantation procedures were completed without immediate complications.
    • No acute complications were associated with the 21 lengthening procedures.
    • Lengthening took 20-30 seconds with minimal patient discomfort, often managed with oral analgesics.

    Conclusions:

    • The Phenix prosthesis demonstrates potential for effective limb length equalization in growing children.
    • This technology may simplify limb preservation strategies in pediatric oncology.
    • Further research is warranted for dynamic applications and long-term outcomes.