PMID: 11901333Mar 20, 2002Paper

The effect of posterior sag on the fixation stability of intertrochanteric hip fractures

The Journal of Trauma
Thomas N JosephKenneth J Koval

Abstract

This study evaluates the effects of posterior sag on the fixation stability of intertrochanteric hip fractures. A simulated, two-part intertrochanteric fracture was created in human cadaveric femurs. One of each pair was stabilized using a sliding hip screw in anatomic reduction and the other in 30 degrees of posterior sag. Measurements for load versus inferior head displacement, gapping, and shearing were made in axial and torsional loading. Initial axial and torsional loading showed no significant differences between the two groups. During cyclic loading, the osteotomy gap in the posteriorly angulated specimens decreased by 0.11 cm at 10 cycles (p = 0.006) and by 0.22 cm at 10,000 cycles (p = 0.33), corresponding to a 2-degree and 6-degree reduction in sag angle. Axial stiffness differed between the two groups: 10.3 N/mm for anatomic versus 6.7 N/mm (p = 0.002) for posteriorly angulated specimens. Loading to failure demonstrated no significant differences between the two groups. This study demonstrated that 30 degrees of posterior sag does not result in a significant difference in construct strength or stability.

References

Jan 1, 1991·Upsala Journal of Medical Sciences·S Ebbinghaus, B Mjöberg
Jan 1, 1991·Injury·A P Thomas
Jan 1, 1987·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·R ChampionP Erb

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Citations

Nov 9, 2007·Medicinski pregled·Zoran GolubovićPredrag Stojiljković
Sep 7, 2016·Applied Bionics and Biomechanics·Jae Hyuk YangSeung Woo Suh
Oct 31, 2017·Journal of Investigative Surgery : the Official Journal of the Academy of Surgical Research·Feiyu LuanJinyi Liu

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