Acute correction of distal femoral deformities by retrograde femoral nail using preoperative planning.

Purpose: This study presents the technique and results of acute correction of distal femoral deformities using retrograde femoral nailing based on preoperative planning without using a fixator.

Methods: Twenty-eight patients (34 limbs: 22 left-sided, 12 right-sided, mean age = 36 years) undergoing distal femoral deformity correction with retrograde femoral nailing between 2013 and 2020 were examined retrospectively. The osteotomy line, block screw location and number were identified by detailed preoperative planning. Osteotomy was performed using the percutaneous multiple drill method, and the retrograde femoral nail was placed.

Results: The average follow-up period was 62.7 months (range: 13-84 months). Postoperatively, the mean mechanical axis deviation was corrected to 6.8 mm (range: 0-8 mm) and the mean mechanical lateral distal femoral angle to 87.42° (range: 84-90°). The Association for the Study an Application of the Method of Ilizarov (ASAMI) score was excellent for all patients. None of the patients had fracture, infection, implant failure, or non-union.

Conclusion: Distal femoral deformities can be corrected acutely, without applying external fixators, with good preoperative planning and using the retrograde femoral nail. This technique is safe and effective, with a low complication rate.