Femoral lengthening and deformity correction using the Fitbone motorized lengthening nail.

Background: This study reports our results with retrograde Fitbone insertion in patients with femoral shortening and deformity. We also present our experience regarding the benefits, complications, and factors associated with complications of the Fitbone technique.

Methods: Twelve males and ten females had femoral shortening and deformities treated using the retrograde Fitbone technique between 2009 and 2012. The etiologies were post-traumatic in 12 patients, poliomyelitis in four, cosmetic in two, congenital hypoplasia in two, achondroplasia in one, and Perthes sequela in one.

Results: The follow-up time was 30.8 months. The mean lengthening was 5.8 (range 2-14) cm. The degree of acute angular correction was 9° (5-22°) in nine cases. The time to full weight-bearing was 5.9 months. The consolidation index was 1.07 (0.75-1.62) months/cm. Complete consolidation was obtained in all cases except two. Running back was observed in two cases.

Conclusions: The Fitbone technique allows accurate deformity correction. The rigid reamers allow the surgeon to use the Fitbone even in patients with a narrow medullary canal. As this might result in poor bone regeneration, thinner lengthening nails should be considered.