在玛钉和可自动动化的内部固定装置中激活滑动螺丝所需的力
Milan M Mitkovic1,2, Nikola D Korunovic3, Sasa S Milenkovic4,5
1Clinic for Orthopaedics and Traumatology "Academician Prof. Dr. Milorad Mitkovic", University Clinical Center Nis, Nis, Serbia. milanmitkovic@hotmail.com.
对骨骨折的动态植入物通过启用滑动螺丝动态化,允许骨愈合. 滑动螺丝和植入物茎之间的较大的接触面减少了动力化所需的力,可能会影响康复协议.
科学领域:
- 骨科生物力学 骨科生物力学
- 手术植入物技术的使用.
背景情况:
- 骨折骨折通常涉及动态植入物与滑动螺丝.
- 在单肢支阶段的横向负荷可能会阻碍螺杆动力化.
- 成功的动力化取决于轴向力克服横向负荷.
研究的目的:
- 在生物力学上比较三个动态部植入物中的活化力:Gamma Nail,SIF-7和SIF-10.
- 研究植入物设计,特别是茎与滑动螺丝之间的接触面积对动力化的影响.
- 为了确定横向负载,曲时刻和滑动螺丝动态化所需的轴力之间的关系.
主要方法:
- 对Gamma Nail,SIF-7 (两个7毫米螺丝) 和SIF-10 (一个10毫米螺丝) 动态植入物进行生物力学测试.
- 使用定制的测试装置,同时在滑动螺丝上应用曲时刻和横向负荷 (Qt).
- 测量轴向力 (Qa) 启动动力化使用拉力测试机在各种曲时刻.
- 使用线性回归模型分析结果.
主要成果:
- 在横向负载 (Qt) 和轴向动力化力 (Qa) 之间发现了显著的正相关性 (p < 0.05).
- 在所有测试的植入物中,较高的曲时刻增加了动力化所需的轴力 (Qa).
- 马钉需要最高的Qa,而SIF-10需要最低的Qa来实现动力化.
结论:
- 滑动螺丝和植入物茎之间的更大的接触面积通过减少所需的轴力来促进动力化.
- 植入物设计,特别是茎螺丝接触,会影响动化所需的力量.
- 患者的因素,如大腿子的长度和体重,可能需要针对腹骨折断裂固定进行量身定制的早期术后康复计划.
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