Mechanical analysis of femoral neck fracture fixation in synthetic bone

Acta Ortopédica Brasileira

Anderson Freitas¹  Bruna Alves Soares Azevedo¹  Roberto Rodrigues De Souza¹  Hélio Ismael Da Costa¹  Rafael Almeida Maciel¹  Diogo Ranier De Macedo Souto¹ 

关键词: Femoral neck fractures;    Fracture fixation;    internal;    Biomechanical phenomenas;   

DOI  :  10.1590/1413-78522014220300914

来源: SciELO

【 摘 要 】

OBJECTIVE: To analyze statistically results obtained between biomechanical assays on fixation of femoral neck fracture type Pauwels III, on synthetic bone, using 7.5 mm non parallel cannulated screws and control group. METHODS: Ten synthetic bones from a national brand were used. Test group: fixation of 70(o) tilt femoral neck osteotomy was performed using three 7.5 mm non parallel cannulated screws. We analyzed the resistance of this fixation with 5 mm of displacement, and rotational deviation (phase 1) and with 10 mm offset (phase 2). Control group: the models were tested in their integrity until the femoral neck fracture occurred. RESULTS: the values of the test group in phase 1, in sample 1-5 had a mean of 517N and SD = 96N. Rotational deviations showed a mean of 3.79° e SD = 2. 03°. In phase 2, mean was 649N and SD = 94N. The values of the maximum load in the control group were: 1544N, 1110N, 1359N, 1194N, 1437N; respectively. Statistical analysis between the groups showed a statistically significant lower value in the test group. CONCLUSION: the analysis of mechanical resistance between the groups has determined statistically significant value for the test group. Level of Evidence III, Case-control Study.

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