Comparative Evaluation ofIn VitroMechanical Properties of Different Designs of Epoxy-Pin External Skeletal Fixation Systems

Autor: H. P. Aithal, Kanti Prakash Tyagi, Prakash Kinjavdekar, S.W. Monsang, Amarpal, A.M. Pawde, Tuhin Srivastava, Surbhi Kuldeep Tyagi
Rok vydání: 2014
Předmět:
Zdroj: Veterinary Surgery. 43:355-360
ISSN: 0161-3499
DOI: 10.1111/j.1532-950x.2014.12128.x
Popis: Objectives To compare in vitro biomechanical properties of different designs of epoxy-pin external skeletal fixator (ESF) constructs. Study Design Mechanical testing study. Sample Population Four epoxy-pin ESF design constructs (uniplanar [EU], multiplanar-I [EM-I], multiplanar-II [EM-II], and circular [EC]) were mechanically tested in compression, bending, and torsion. Methods Four different designs of free-form epoxy-pin external fixator constructs were developed using 1.5 mm K-wires and epoxy resin mounted in an ultra-high density polyethylene rod (20 mm diameter). Three-point fixation was done in each fragment, and the distance between fixation wires, and between the rod and the side bars was kept constant in all the designs. A 5 mm gap was maintained at the center of the fixation rod to simulate an unstable fracture condition. The fixator constructs (n = 12 of each design) were subjected to mechanical testing in axial compression, bending, or torsion. Load–deformation curves were generated and mechanical properties were compared between construct types. Results EU was the weakest design. Under compression, constructs EM-I, EM-II, and EC were similar. Under bending, EM-I and EM-II had similar strength, whereas EC was strongest. Under torsion, EC was strongest, followed by EM-II, EM-I, and EU; EM-II provided double the rotational stability of EM-I. Conclusions Overall, EC followed by EM-II epoxy-pin fixator designs had better mechanical strength.
Databáze: OpenAIRE