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Clin Biomech (Bristol, Avon). 2012 Oct;27(8):819-23. doi: 10.1016/j.clinbiomech.2012.05.007. Epub 2012 Jun 7.

Cyclic loading of fractured cadaveric femurs after elastomer femoroplasty: an in vitro biomechanical study.

Author information

1
Leiden University Medical Center, Department of Surgery, Leiden, The Netherlands. timvandersteenhoven@gmail.com

Abstract

BACKGROUND:

Elastomer femoroplasty is a novel and experimental approach in the prevention of hip fracture surgery. Previously, we published the results of an in vitro cadaveric experiment in which we showed a significant reduction of fracture displacement in treated femurs. The aim of the present study was to establish the failure loads and inter-fragmentary movement of fractured, elastomer femoroplasty treated femurs during cyclic loading.

METHODS:

16 cadaveric femurs were treated with elastomer femoroplasty and fractured in a simulated fall configuration. Each specimen underwent 10 cycles with a preload of 50 N, starting with a peak load of 250 N followed by 10 cycles of 500 N and continued with 500 N increments. The crosshead speed was 2 mm/s. The failure load, the number of completed cycles, and crosshead extensions were recorded.

FINDINGS:

The mean failure load was 2709 N (SD 1094). The number of completed cycles until failure was 60 (SD 22). The mean translation during maximum loading was 5.25 mm (SD 0.9). At 1500 N (two times the bodyweight of a 75 kg individual) the extension was 3.16 mm.

INTERPRETATION:

Preventive elastomer femoroplasty leads to the stabilization of the proximal femur after fracture. In a single leg stance configuration, cyclic loading with mean failure loads that well exceed the peak loads during normal gait is feasible.

[Indexed for MEDLINE]

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