A Biomechanical Comparison of First Metatarsophalangeal Arthrodesis Using Crossed Screws and Shape-Memory Staples in Various Configurations:

Foot & Ankle Orthopaedics

John E.Grice¹ 

关键词: arthrodesis;    hallux rigidus;    staples;    screws;    biomechanics;   

DOI  :  10.1177/2473011416S00052

学科分类：医学（综合）

来源: Sage Journals

【 摘 要 】

Category:Midfoot/ForefootIntroduction/Purpose: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.Methods: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 sim...

【 授权许可】

CC BY