Research summary
A study of 15 patients with achondroplasia who underwent simultaneous bilateral femoral lengthening with internal nails. The technique achieved 97% reliability and 96% accuracy, with temporary knee stiffness as the most common complication.
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.
| 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 |
The most common complication was temporary restriction of knee range of motion during the distraction phase, occurring in 10 of 30 lengthened segments. One patient required two unplanned surgeries due to premature consolidation (the bone healed before the target length was reached). No infections, nerve injuries, or device failures were reported.
For young patients with achondroplasia, modern internal lengthening nails can achieve very precise femoral lengthening with relatively few complications. The nails delivered almost exactly the planned amount of lengthening (49 mm out of 50 mm planned). The main issue during treatment was temporary knee stiffness, which is expected when the muscles and soft tissues are being gradually stretched. This study adds to the evidence that internal nails are a reliable option for this patient population.
Informational only. Not medical advice.