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Critical Reviews™ in Biomedical Engineering
SJR: 0.243 SNIP: 0.376 CiteScore™: 0.79

ISSN Print: 0278-940X
ISSN Online: 1943-619X

Critical Reviews™ in Biomedical Engineering

DOI: 10.1615/CritRevBiomedEng.v28.i12.40
pages 11-16

The Effect of Screw Insertion Site and Unused Drill Holes on Stability and Mode of Failure After Fixation of Basicervical Femoral Neck Fracture

Paul Stafford
Department of Orthopaedic Surgery, University of Tennessee, College of Medicine, Chattanooga, TN
Ronald Goulet
College of Engineering & C.Sc., University of Tennessee at Chattanooga, Chattanooga, TN
Brent Norris
Department of Orthopaedic Surgery, University of Tennessee, College of Medicine, Chattanooga, TN

ABSTRACT

The intent of this biomechanical study is to characterize the effect of unused drill holes and cannulated screw insertion site on the fixation stability and mode of failure after fixation of basicervical femoral neck fractures. Fourteen matched pairs of embalmed human cadaver femora were sorted into four groups according to the level of screw insertion along the lateral cortex. Screws inserted at higher positions along the lateral cortex afforded higher rigidity, thus decreasing the amount of motion at the fracture site. In addition, higher insertion positions reduced the rate of permanent displacement, thus better maintaining reduction. Although all specimens failed at the neck, post-failure inspection revealed upward translation of the inferior screw head when inserted 20 mm below the lesser trochanter. Unused drill holes and guidepin holes had no observed affect on stability or failure mode.


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