In brief
What did the 15-patient achondroplasia study show, and what are its limits?
In 15 selected patients with achondroplasia, a retrospective single-center study reported 97% nail reliability and 96% accuracy. Ten of 30 segments had temporary knee-motion restriction, and one patient needed two unplanned surgeries. These findings do not establish outcomes for adult cosmetic lengthening or other diagnoses and devices.
Limits: This summary explains evidence context and limitations; it is not medical advice.
- Evidence
- Peer-reviewed evidence
- Source set
- Peer-reviewed sources
- Updated
- References
- 1 listed
Editorial responsibility: Limb Lengthening Library editorial team. Independent medical review is not claimed unless a named reviewer is listed. How sources are reviewed.
What this study covers
Published in 2024 in Acta Orthopaedica by Vogt and colleagues, this study followed 15 patients with achondroplasia (a genetic condition causing disproportionately short limbs) who underwent simultaneous bilateral femoral lengthening using motorized intramedullary nails via an antegrade approach. The patients had a median age of 14 years, and all were followed for at least 2 years after surgery.
Key results
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| Measure | Result |
|---|---|
| Patients | 15 (30 femoral segments) |
| Planned distraction | 50 mm (median) |
| Achieved distraction | 49 mm (median) |
| Accuracy | 96% |
| Precision | 95% |
| Reliability | 97% |
| Consolidation index | 20 days per cm |
Complications
Temporary restriction of knee range of motion during distraction occurred in 10 of 30 lengthened segments. One patient required two unplanned surgeries for premature consolidation. No infections, nerve injuries, or device failures were reported within this small cohort and its follow-up; absence in 15 patients is not proof of zero risk.
What this means in plain terms
In this retrospective single-center cohort, the nails achieved a median 49 mm against a median 50 mm plan, with calculated reliability, accuracy, and precision of 97%, 96%, and 95%. Those technical measures and the authors' conclusion apply to 15 selected patients with achondroplasia and at least two years of follow-up. They do not establish outcomes for adult cosmetic surgery, other diagnoses, other nail models, or larger populations, and temporary loss of knee motion should not be described as inevitable or clinically trivial.
Sources
Verification policyInformational only. Not medical advice.