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Femoral fracture malrotation caused by freehand versus naviated distal interlocking
Femoral fracture malrotation caused by freehand versus naviated distal interlocking INJURY-INTERNATIONAL JOURNAL OF THE CARE OF THE INJURED Gardner, M. J., Citak, M., Kendoff, D., Krettek, C., Huefner, T. 2008; 39 (2): 176-180Abstract
Rotational deformity following intramedullary nailing of femoral shaft fractures is a clinically significant and underdiagnosed problem. Intraoperative determination of rotation is difficult and may be caused by several factors. The insertion of interlocking screws at a slightly oblique angle may cause a substantial degree of rotational deformity, and this factor has not been evaluated as a cause of malrotation.In eight paired cadaveric femurs, a midshaft transverse fracture was created and an antegrade nail was placed. The specimens were placed in a custom jig which allowed free rotation of the distal segment. Distal interlocking was performed using either a freehand technique or with navigation, and femoral anteversion was measured before and after interlocking to determine the change caused by the interlocking screw.Freehand placement led to rotational shift up to 7 degrees (mean, 5.8 degrees ; range, 4-7 degrees ), and navigated insertion led to a change of 2.0 degrees (range, 1-3 degrees ; p<0.05). In addition, drill-nail contact and a visible shift of the fracture site occurred in all freehand trials, whereas in the navigation group, contact occurred in only one trial without fracture movement.Freehand distal interlocking may be a substantial cause of rotational deformity, and the assistance of computer navigation systems may improve this malrotation.
View details for DOI 10.1016/j.injury.2007.06.008
View details for Web of Science ID 000253606200005
View details for PubMedID 17888433