Mechanical analysis of femoral neck fracture fixation with dynamic condylar screw in synthetic bone

• Published in: Acta ortopedica brasileira 2014, Vol.22 (5), p.264-268
• Main Authors: Freitas, Anderson, Maciel, Rafael Almeida, Lima, Renato De Almeida, Souto, Diogo Ranier De Macedo, Ferrer, Marcelo De Almeida
• Format: Article
• Language: English
• Subjects: Biomechanical phenomena; Femoral neck fractures; Internal fixators; Original; ORTHOPEDICS
• ISSN: 1413-7852; 1809-4406; 1413-7852; 1809-4406
• DOI: 10.1590/1413-78522014220500922

To analyze statistically results in biomechanical testing of fixation of femoral neck Pauwels type III fractures, on synthetic bone, with dynamic condylar screw (DCS) and control group. Ten synthetic bones of a national brand were used. Test Group: fixation was performed after osteotomy at 70(o) tilt using DCS plate with four holes. We analyzed the resistance of this fixation with 5 mm displacement and rotational deviation (Step 1) and with10 mm (Step 2). the models were tested in their integrity until the femoral neck fracture occurred. The values of the test group in Step 1 showed a mean of 974N and SD = 114N. In Stage 2, we obtained on average 1335N and SD = 98N. The values in the control group were: 1544N, 1110N, 1359N, 1194N, 1437N, respectively. Statistical analysis using the Mann-Whitney test for comparison of the maximum force (N) between the test group and the control, in Step 2, demonstrated that there is no significant difference between the DCS and control plates (p = 0.91). There is no significant difference between the DCS boards and the control group exposed to full resistance. Level of Evidence III, Case Control.