动力髁螺钉固定人工合成骨股骨颈骨折的力学分析

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

作者信息

Freitas Anderson, Maciel Rafael Almeida, Lima Renato De Almeida, Souto Diogo Ranier De Macedo, Ferrer Marcelo De Almeida

机构信息

Hospital Ortopédico e Medicina Especializada, Brasília, DF, Brazil, Hospital Ortopédico e Medicina Especializada (HOME), Brasília, DF, Brazil.

出版信息

Acta Ortop Bras. 2014;22(5):264-8. doi: 10.1590/1413-78522014220500922.

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.

目的

对使用动力髁螺钉（DCS）固定人工合成骨上的股骨颈 Pauwels III 型骨折的生物力学测试结果与对照组进行统计学分析。

方法

使用十个某国产品牌的人工合成骨。试验组：在以 70°倾斜进行截骨后，使用四孔 DCS 钢板进行固定。我们分析了这种固定在 5 毫米位移和旋转偏差（步骤 1）以及 10 毫米（步骤 2）时的阻力。

对照组

对模型的完整性进行测试，直至发生股骨颈骨折。

结果

试验组在步骤 1 的值显示平均为 974N，标准差 = 114N。在第 2 阶段，我们平均获得 1335N，标准差 = 98N。对照组的值分别为：1544N、1110N、1359N、1194N、1437N。在步骤 2 中，使用 Mann-Whitney 检验对试验组和对照组之间的最大力（N）进行比较的统计分析表明，DCS 钢板和对照组之间没有显著差异（p = 0.91）。