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Children's Orthopaedics

EXTERNAL FIXATION FOR FEMORAL DEROTATION OSTEOTOMY IN DDH SURGERY

Warwick, England, 22 January 2010



Abstract

Purpose of Study

To evaluate the results of using external fixation to stabilise femoral derotation osteotomy involved in DDH surgery.

Methods and results

A retrospective analysis was performed on 44 patients undergoing 48 femoral osteotomies for DDH surgery between the years 2001 and 2009 by a single surgeon (senior author MC). The external fixator was used either during the primary procedure involving femoral shortening to aid in hip reduction (4 patients) or to correct femoral malrotation in a reduced hip as a secondary procedure(40 patients). As the external fixator frame was within the hip spica it was not a cause of concern to the parents or the child.

There was no evidence of any pin tract infection and all patients eventually progressed to satisfactory bony union. One patient had delayed union which was treated successfully with conservative management and one patient had a malunion requiring a further osteotomy and extended treatment with the external fixator.

Conclusion

External fixation is a viable alternative for the traditional internal fixation used for femoral osteotomy involving DDH Surgery. Our study has shown that it produces satisfactory results with minimal complications. Apart from minimising tissue scarring in the muscle and subcutaneous planes, it gives a cosmetically better scar. If there is further need for revision surgery it provides healthy tissue planes for dissection. Furthermore it eliminates the need for additional surgery required for removal of plates.