Journal
INJURY-INTERNATIONAL JOURNAL OF THE CARE OF THE INJURED
Volume 43, Issue 6, Pages 749-756Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.injury.2011.08.020
Keywords
Randomized control study; Computer navigation; Femur shaft fracture; Reduction; Fixation
Funding
- Stryker Canada
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Objectives: We investigated the accuracy of reduction of intramedullary nailed femoral shaft fractures in human cadavers, comparing conventional and computer navigation techniques. Methods: Twenty femoral shaft fractures were created in human cadavers, with segmental defects ranging from 9 to 53 mm in length (Winquist 3-4, AO 32C2). All fractures were fixed with antegrade 9 mm diameter femoral nails on a radiolucent operating table. Five fractures (Fluoro'' group) were fixed with conventional techniques and fifteen fractures (Nav 1'' and Nav 2'' groups) with computer navigation, using fluoroscopic images of the normal femur to correct for length and rotation. Postoperative CT scans compared femoral length and rotation with the normal leg. Results: Mean leg length discrepancy in the computer navigation groups was smaller, namely, 3.6 mm for Nav 1 (95% CI: 1.072 to 6.128) and 4.2 mm for Nav 2 (95% CI: 0.63 to 7.75) vs. 9.8 mm for Fluoro (95% CI: 6.225 to 13.37) (p < 0.023). Mean rotational discrepancies were 8.7 degrees for Nav 1 (95% CI: 4.282 to 13.12) and 5.6 degrees for Nav 2 (95% CI: -0.65 to 11.85) vs. 9.0 degrees for Fluoro (95% CI: 2.752 to 15.25) (p = 0.650). Conclusions: Computer navigation significantly improves the accuracy of femoral shaft fracture fixation with regard to leg length, but not rotational deformity. (C) 2011 Elsevier Ltd. All rights reserved.
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