@article{Grice:2016:10.1177/2473011416s00052,
author = {Grice, JE and Willmott, H and Halewood, C and MBiomedE, M and Dunning, M and Amis, A},
doi = {10.1177/2473011416s00052},
journal = {Foot & Ankle Orthopaedics},
title = {A Biomechanical Comparison of First Metatarsophalangeal Arthrodesis Using Crossed Screws and Shape-Memory Staples in Various Configurations},
url = {http://dx.doi.org/10.1177/2473011416s00052},
volume = {1},
year = {2016}
}

Download

TY  - JOUR
AB  - <jats:sec><jats:title>Category:</jats:title><jats:p> Midfoot/Forefoot </jats:p></jats:sec><jats:sec><jats:title>Introduction/Purpose:</jats:title><jats:p> Arthrodesis of the first metatarsophalangeal joint (MTPJ) is a commonly performed procedure for the treatment of hallux rigidus. A range of fixation methods have been used. Most recently, the shape-memory staple has been described. Made from an equiatomic alloy, the staple changes its shape when heated to body temperature so as to provide compression across the arthrodesis. We aimed to determine load to failure, cyclic loading and failure characteristics of different staple configurations compared to crossed screws. </jats:p></jats:sec><jats:sec><jats:title>Methods:</jats:title><jats:p> A cadaveric porcine model was used to simulate first MTPJ arthrodesis. Five forms of fixation were tested: single vertical staple; single horizontal staple; paired staples in orthogonal superior-inferior and medial-lateral configuration (0-90° to sagittal plane); paired staples in an oblique orthogonal configuration (45-135° to sagittal plane); two crossed screws. Using a materials-testing machine, specimens were loaded in dorsiflexion to simulate weight bearing. Cyclical loading was performed from 5-40N at a rate of 0.5 Hz for 1000 cycles. Plantar gapping, shear and creep were measured. Specimens were then loaded to failure in order to generate a load-displacement curve. The mechanism of failure was noted for each group. </jats:p></jats:sec><jats:sec><jats:title>Results:</jats:title><jats:p> Single staple configurations failed at very low loads. Single vertical staples failed at a mean load 15N±5N and single horizontal staples at 19N±3N. Mean failure load for paired 0-90° staples was 43N±9N which was significantly lower than the paired 45-135° staples which failed
AU  - Grice,JE
AU  - Willmott,H
AU  - Halewood,C
AU  - MBiomedE,M
AU  - Dunning,M
AU  - Amis,A
DO  - 10.1177/2473011416s00052
PY  - 2016///
SN  - 2473-0114
TI  - A Biomechanical Comparison of First Metatarsophalangeal Arthrodesis Using Crossed Screws and Shape-Memory Staples in Various Configurations
T2  - Foot & Ankle Orthopaedics
UR  - http://dx.doi.org/10.1177/2473011416s00052
UR  - https://doi.org/10.1177/2473011416s00052
VL  - 1
ER  - 

Download