Title: Biomechanical evaluation of bone-cement augmented Proximal Femoral Nail Antirotation blades in a polyurethane foam model with low density
Authors: Sermon, An ×
Boner, V
Schwieger, K
Boger, A
Boonen, Steven
Broos, Paul
Richards, G
Windolf, M #
Issue Date: Aug-2011
Publisher: J. Wright
Series Title: Clinical Biomechanics vol:27 issue:1 pages:71-76
Abstract: BACKGROUND: Helically shaped cephalic implants have proven their benefit to provide an improved stabilization of unstable hip fractures. However, cut out ratios up to 3.6% still occur. This in vitro study evaluated the biomechanical performance of a novel cement augmentation technique of the Proximal Femoral Nail Antirotation in surrogate femora. METHODS: Four study groups were formed out of 24 polyurethane foam specimens with low density. Proximal Femoral Nail Antirotation blades were implanted, either non-augmented, or augmented using 3ml of injectable Polymethylmethacrylate bone-cement. The influence of implant mal-positioning was investigated by placing the blade either centered in the femoral head or off-centric in an anteroposterior direction. All specimens underwent cyclic loading under physiological conditions. Starting at 1000N, the load was monotonically increased by 0.1N/cycle until construct failure. Movement of the head was identified by means of optical motion tracking. Non-parametric test statistics were carried out on the cycles to failure, to compare between study groups. FINDINGS: Compared to control samples; augmented samples showed a significantly increased number of cycles to failure (P=0.012). In the groups with centric position of the Proximal Femoral Nail Antirotation blade, cement augmentation led to an increase in loading cycles of 225%. In the groups with off-centric positioning of the blade, this difference was even more accentuated (933%). INTERPRETATION: Cement augmentation of the Proximal Femoral Nail Antirotation blade with small amounts of bone-cement for treatment of osteoporotic hip fractures clearly enhances fixation stability and carries high potential for clinical application.
ISSN: 0268-0033
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Gerontology and Geriatrics
Surgery - miscellaneous (-)
Biomechanics, -implants and Tissue Engineering (-)
× corresponding author
# (joint) last author

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