OBJECTIVE: 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. METHODS: 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). CONTROL GROUP: the models were tested in their integrity until the femoral neck fracture occurred. RESULTS: 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). CONCLUSION: There is no significant difference between the DCS boards and the control group exposed to full resistance. Level of Evidence III, Case Control.
OBJECTIVE: 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. METHODS: 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). CONTROL GROUP: the models were tested in their integrity until the femoral neck fracture occurred. RESULTS: 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). CONCLUSION: There is no significant difference between the DCS boards and the control group exposed to full resistance. Level of Evidence III, Case Control.
Authors: A C Baitner; S G Maurer; D G Hickey; L M Jazrawi; F J Kummer; J Jamal; S Goldman; K J Koval Journal: Clin Orthop Relat Res Date: 1999-10 Impact factor: 4.176
Authors: Arash Aminian; Fan Gao; Wasyl W Fedoriw; Li-Qun Zhang; David M Kalainov; Bradley R Merk Journal: J Orthop Trauma Date: 2007-09 Impact factor: 2.512