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Growth prediction in extendable tumor prostheses in children
M Dominkus1, P Krepler, E Schwameis
1Department of Orthopaedics, University Clinic of Vienna, Austria.
Clinical Orthopaedics and Related Research
|September 12, 2001
Summary
Extendable prostheses for pediatric bone cancer successfully equalized leg length. Actual limb lengthening exceeded predictions, ensuring optimal outcomes after tumor resection surgery.
Area of Science:
- Pediatric Orthopedic Oncology
- Biomedical Engineering
- Skeletal Growth Research
Background:
- Limb salvage surgery for pediatric bone tumors often requires physeal resection, risking leg length discrepancy.
- Accurate prediction of remaining growth is crucial for limb length equalization in children.
Purpose of the Study:
- To compare predicted growth with actual prosthetic elongation in children undergoing limb salvage for lower limb bone tumors.
- To evaluate the efficacy of extendable tumor endoprostheses in achieving equal leg length.
Main Methods:
- Retrospective analysis of 15 skeletally mature children with lower limb malignant bone tumors.
- Resection of distal femoral or proximal tibial physes and reconstruction with custom-made extendable prostheses.
- Comparison of predicted growth versus actual prosthetic elongation over 70-158 months follow-up.
Main Results:
- Mean limb elongation of 10.4 cm (range, 1.1-19.5 cm) was achieved.
- Actual elongation exceeded predicted growth by 24.3%.
- Final leg length discrepancies were less than 1 cm.
Conclusions:
- Incremental extendable tumor endoprostheses effectively equalize leg length discrepancies in children after malignant bone tumor resection.
- Individualized prosthetic elongation allows for precise adaptation to achieve symmetrical limb length.
- This approach offers a reliable solution for managing growth disturbances post-oncologic surgery.