Resumen

RAMOS BOTELLO, Yoan Manuel; ESTRADA CINGUALBRES, Roberto  y  BOSCH CABRERA, Jorge Alexander. Use of finite elements in a comparative study of two internal fixation systems for hip fractures. Rev Cubana Ortop Traumatol [online]. 2013, vol.27, n.2, pp.186-198. ISSN 0864-215X.

Introduction: due to the wide variety of internal fixation systems for the treatment of fractures, it is common practice that the same fixator is used for various fracture types. As a result, it is difficult to tell which of the internal fixation systems will perform better in terms of tensional status. Objective: applying the finite-element method, analyze the behavior of the internal fixation devices DHS plate and dynamic compression plate, used in the treatment of hip fractures. Methods: the model femur was obtained with authorization by the human bone model repository (International Society of Biomechanics FiniteElement Mesh Repository), and studied by computerized axial tomography. Estimations took into account both muscle action and body weight in the monopodal phase of the gait cycle. Determination was made of the tensional status and the number of cycles undergoing fatigue failure. Results: the most unfavorable results corresponded to the 130º-angled dynamic compression plate, which exhibited the highest tension values and the smallest number of cycles. Conclusions: the 130º-angled dynamic compression plate frequently breaks. Hence the advisability of using the DHS plate in the treatment of 31B2.1 hip fractures whenever it is clinically possible.

Palabras clave : finite elements; biomechanics; internal fixation systems; hip fractures.

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