Internal fixation materials for posterior ankle fracture and its biomechanical properties

doi:10.3969/j.issn.2095-4344.2015.44.024

Abstract

Abstract:

BACKGROUND: Posterior malleolar fracture is an important factor affecting the prognosis of ankle fractures. Posterior malleolar fracture often caused by high energy trauma. Using what kind of fixation and fixation materials biomechanics, and how to embed has become a current research hotspot.

OBJECTIVE: To compare the clinical outcomes of different fixation materials on posterior malleolar fracture, and analyze the effect of different fixation methods on biomechanical outcome of posterior malleolar fracture fixation, so as to provide a basis and reference of selecting the best fixation for the clinical treatment of ankle fracture. METHODS: The relevant literature included by PubMed database and the China National Knowledge database from the year of 1976 to 2015 were retrieved by the first author through computer. English key words are “Ankle fracture; internal fixation; biomechanics; biocompatibility”, Chinese language search terms are “posterior malleolar fracture; internal fixation; biomechanics; biocompatibility”. Summarize the most commonly used metal fixation materials and absorbable content materials. The clinical commonly used metal fixation materials including bone plate and screws, absorbable fixation materials such as biodegradable material polylactic acid, polyethylene plastic ester, polylactide gum ester, etc. The biomechanical properties were analyzed.

RESULTS AND CONCLUSION: The new locking screw can withstand more buckling and shear force. Lag screw has a tapping action, and the pulling was stronger after tapping, but for patients with osteoporosis, the pressure effect of screw on fracture fragments was limited, the strength was not enough, at this time, locking plate should be used. Locking plate has a greater stability and higher confrontational feature to bending stress, less likely to pull out. Steel coupling screw provides better stability. To avoid secondary removing of the fixation, stress protection after fixation and other shortcomings after the metal material fixation fracture healing, the strength of the absorbable fixation material made by biodegradable material polylactic acid, polyvinyl acetate glue and polypropylene plastic ester after high temperature and pressure processing was increased. Absorbable fixation material may overcome the adverse effects associated with metal fixation, such as imageological examination, secondary implant removal. These results show that the mechanical properties of the absorbable screws are more closer to human bone, no surrounding bone vulnerability due to stress shields, no osteoporosis occurs, and can degrade in the body, but its fixation strength is still less than the traditional fixed screw and bone plate. We should choose a suitable fixation material according to the forces of fracture site and the size of the fracture fragments.
中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Ankle Joint, Fractures, Bone, Internal Fixators, Biomechanics, Biocompatible, Tissue Engineering

Figures/Tables 1

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