Mechanical Expandable Tumoral Prosthesis Lengthening Mechanism Collapse: Salvage with Magnetic Expandable Prosthesis

Authors

  • Sónia Rodrigues Serviço de Ortopedia Pediátrica do Hospital Pediátrico de Coimbra – Unidade Local de Saúde de Coimbra, Coimbra, Portugal https://orcid.org/0000-0002-9952-8010
  • Inês Balacó Serviço de Ortopedia Pediátrica do Hospital Pediátrico de Coimbra – Unidade Local de Saúde de Coimbra, Coimbra, Portugal https://orcid.org/0000-0002-4182-5637
  • Cristina Alves Serviço de Ortopedia Pediátrica do Hospital Pediátrico de Coimbra – Unidade Local de Saúde de Coimbra, Coimbra, Portugal https://orcid.org/0000-0002-1054-4832
  • Gabriel Matos Serviço de Ortopedia Pediátrica do Hospital Pediátrico de Coimbra – Unidade Local de Saúde de Coimbra, Coimbra, Portugal

Keywords:

Child, Prostheses and Implants, Prosthesis Design, Osteosarcoma/surgery

Abstract

We describe a clinical case of a patient with osteosarcoma, who underwent resection and reconstruction with an expandable prosthesis, mechanical failure of the lengthening device and sudden dysmetria. Girl, 8 years old, with distal metadiaphyseal osteosarcoma of the left femur. She underwent a 14cm resection and reconstruction with an expandable prosthesis. Mechanical lengthening without complications, totaling 4.4 cm. Clinical dysmetria of 2 cm at maturity. At 16, she suffered a fall which damaged the mechanical system of the prosthesis and caused the lengthening to collapse. She opted for revision with an electromagnetic lengthening prosthesis (4.6 cm over 2 months). At the age of 18, it was replaced with a definitive modular prosthesis. At 6 months post‑surgery, he had no pain and radiological dysmetria of 2 cm, with no need for compensation. We describe an unusual case in which we used an electromagnetic lengthening prosthesis to solve a complication of a mechanical expandable prosthesis.

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Published

2025-03-09

Issue

Vol. 1 No. 3 (2024): September / December

Section

Case Report

License

Copyright (c) 2025 Sónia Rodrigues, Inês Balacó, Cristina Alves, Gabriel Matos (Author)

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

Mechanical Expandable Tumoral Prosthesis Lengthening Mechanism Collapse: Salvage with Magnetic Expandable Prosthesis. (2025). Orthopaedic SPOT, 1(3), 149-153. https://orthopaedicspot.com/index.php/journal/article/view/54

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