Author/Authors :
FreitAs, Anderson instituto de Pesquisa e Ensino do Hospital Ortopédico e Medicina Especializada (IPE-HOME), Brasília, DF, Brazil , CAmArgo, Welvis soAres Hospital Regional do Gama (HRG), Brasília, DF, Brazil , Aquino, ruben Jeri Hospital Regional do Gama (HRG), Brasília, DF, Brazil , giordAno neto, vinCenzo Hospital Municipal Miguel Couto (HMMC), Rio de Janeiro, RJ, Brazil , FernAndes bonAvides Junior, Aluízio Hospital das forças Armadas (HFA), Brasília, DF, Brazil , CArlos shimAno, Antônio Department of Biomechanics - Medicine and Rehabilitation of the Locomotor Apparatus - Universidade de São Paulo (USP), Ribeirão Preto, SP, Brazil
Abstract :
Objective: To evaluate the mechanical behavior of the proximal end
of the femur submitted to the X-shaped polymethylmethacrylate
(PMMA) reinforcement technique. Methods: Fifteen synthetic femurs,
with a Nacional® density of 10 PCF, were divided into two groups: the
DX group, with 5 units that were submitted to PMMA reinforcement,
and the DP group, with 10 units, which were evaluated intact. The
volume of PMMA required, the maximum load, and the absorbed
energy to fracture were analyzed by means of a static mechanical
bending test simulating a fall on the greater trochanter. Results:
A mean of 6 ml of PMMA was used to model the X-reinforcement;
it was observed that the DX group presented significantly higher
maximum load (median = 1553 N, p = 0.005) and absorbed
energy to fracture (median = 9.7 J; p = 0.050) than the DP group
(median = 905 N and 6.6 J). Conclusion: X-reinforcement of the
proximal end of synthetic femurs showed a statistically significant
increase in the maximum load and absorbed energy to fracture in
the mechanical assay when compared to the control group. Level
of Evidence III, Experimental study.
Keywords :
Intertrochanteric fractures , Femur , Femoral fractures , Polymethylmethacrylate , Osteoporosis
