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The endlock tumor prosthesis with short-length fixation: a clinical study
Leonhard E Ramseier1, Clement M Werner, Hilaire A C Jacob
1Department of Orthopaedics, University of Zürich, Switzerland. leonhard.ramseier@balgrist.ch
American Journal of Orthopedics (Belle Mead, N.J.)
|October 1, 2010
Summary
This study introduces a new intramedullary stem for lower limb prostheses, showing favorable bone remodeling and reduced loosening risk. Clinical outcomes demonstrate good functional recovery and radiographic bone integration over time.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Bone Remodeling
Background:
- Diaphyseal bone anchorage for segmental replacement prostheses presents challenges in lower limb reconstruction.
- Finite element analysis predicted favorable bone remodeling with a novel intramedullary anchorage system.
Purpose of the Study:
- To evaluate the clinical and radiographic outcomes of a new prosthesis design with an intramedullary anchorage system.
- To assess bone remodeling and implant stability in patients undergoing lower limb reconstruction.
Main Methods:
- Retrospective analysis of 24 patients (25 reconstructions) with the new prosthesis stem, including primary and revision cases.
- Prospective data collection with a mean follow-up of 61 months.
- Radiographic evaluation using the 1991 ISOLS Radiological Implant Evaluation System.
Main Results:
- Mean follow-up of 61 months showed Toronto Extremity Salvage Score (TESS) of 80% and Musculoskeletal Tumor Society Rating Scale score (MSTS) of 65% of normal.
- Radiographic evaluation revealed 65% excellent and 35% good bone remodeling around the implant.
- Only two patients (8.3%) experienced stem loosening, supporting reduced risk.
Conclusions:
- The novel intramedullary anchorage system demonstrates favorable bone remodeling and reduced risk of loosening.
- The prosthesis design supports good functional outcomes and bone integration in lower limb reconstructions.
