RESUMO
OBJECTIVE: To analyze the results of biomechanical assays of fixation of Pauwels type III femoral neck fracture in synthetic bone, using 7.5mm cannulated screws in inverted triangle formation, in relation to the control group. METHODS: TEN SYNTHETIC BONES WERE USED, FROM A DOMESTIC BRAND, DIVIDED INTO TWO GROUPS: test and control. In the test group, a 70° tilt osteotomy of the femoral neck was fixated using three cannulated screws in inverted triangle formation. The resistance of this fixation and its rotational deviation were analyzed at 5mm displacement (phase 1) and 10mm displacement (phase 2). The control group was tested in its integrity until the fracture of the femoral neck occurred. The Mann-Whitney test was used for group analysis and comparison. RESULTS: The values in the test group in phase 1, in samples 1-5, showed a mean of 579N and SD =77N. Rotational deviations showed a mean of 3.33°, SD = 2.63°. In phase 2, the mean was 696N and SD =106N. The values of the maximum load in the control group had a mean of 1329N and SD=177N. CONCLUSION: The analysis of mechanical strength between the groups determined a statistically significant lower value in the test group. Level of Evidence III, Control Case.
RESUMO
Analisar resultados entre ensaios biomecânicos na fixaçãoda fratura do colo femoral tipo Pauwels III, em osso sintético, utilizandoparafusos canulados de 7.5mm, na formação de triânguloinvertido e grupo controle. Métodos: Foram utilizados dez ossossintéticos, de uma marca nacional do modelo C1010. Divididos emdois grupos: Teste e controle. No grupo teste foi realizado fixação eosteotomia, com 70° inclinação, ao nível do colo femoral utilizandotrês parafusos canulados na formação de triângulo invertido. Analisou-sea resistência desta fixação com 5mm de deslocamento, edesvio rotacional (Fase 1) e com 10 mm de deslocamento (Fase 2).O grupo controle foi ensaiado em sua integridade, até que ocorressea fratura do colo femoral. Para análise, utilizou-se o teste de Mann--Whitney comparando os grupos. Resultados: Os valores no grupoteste na fase 1, nas amostras de 1 a 5, obteve uma média de 579Ne DP=77. Os desvios rotacionais apresentaram média de 3.33° eDP=2.63°. Na fase 2, obteve-se uma média de 696 N e DP=106.Os valores da carga máxima no grupo controle obteve uma médiade 1329N e DP=177. Conclusão: A análise da resistência mecâ-nica entre os grupos determinou valor estatístico significantementemenor no grupo teste. Nível de Evidência III, Caso Controle...
To analyze the results between the biomechanical fixationof Pauwels type III femoral neck fracture, in synthetic bone,using 7.5mm cannulated screws in an inverted triangle formation,and a control group. Methods: Ten synthetic bones were used,from a domestic brand of the C1010 model. Divided into twogroups: test and control. In the test group, a 70° tilt osteotomyof the femoral neck was fixated using three cannulated screwsin an inverted triangle formation. The resistance of this fixationand its rotational deviation was analyzed at 5mm displacement(phase 1) and 10mm displacement (phase 2). The control groupwas tested in its integrity until the fracture of the femoral neck. TheMann-Whitney test was used for group analysis and comparison.Results: The values in the test group in phase 1, in samples 1-5,had a mean of 579N and SD=77N. Rotational deviations showeda mean of 3.33°, SD=2.63°. In phase 2, the mean was 696Nand SD=106N. The values of the maximum load in the controlgroup had a mean of 1329N and SD=177N. Conclusion: Theanalysis of mechanical strength between the groups determineda significantly lower statistical value in the test group. Level ofEvidence III, Control Case...
