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首页> 外文期刊>Orthopaedic Journal of Sports Medicine >Do Prophylactic Knee Braces Protect the Knee Against Impacts or Tibial Moments? An In Vitro Multisensory Study
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Do Prophylactic Knee Braces Protect the Knee Against Impacts or Tibial Moments? An In Vitro Multisensory Study

机译：预防性膝关节矫正器能保护膝盖免受撞击或胫骨力矩吗？体外多感官研究

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Background: Knee braces are prescribed by physicians to protect the knee from various loading conditions during sports or after surgery, even though the effect of bracing for various loading scenarios remains unclear. Purpose: To extensively investigate whether bracing protects the knee against impacts from the lateral, medial, anterior, or posterior directions at different heights as well as against tibial moments. Study Design: Controlled laboratory study. Methods: Eight limb specimens were exposed to (1) subcritical impacts from the medial, lateral, anterior, and posterior directions at 3 heights (center of the joint line and 100 mm inferior and superior) and (2) internal/external torques. Using a prophylactic brace, both scenarios were conducted under braced and unbraced conditions with moderate muscle loads and intact soft tissue. The change in anterior cruciate ligament (ACL) strain, joint acceleration in the tibial and femoral bones (for impacts only), and joint kinematics were recorded and analyzed. Results: Bracing reduced joint acceleration for medial and lateral center impacts. The ACL strain change was decreased for medial superior impacts and increased for anterior inferior impacts. Impacts from the posterior direction had substantially less effect on the ACL strain change and joint acceleration than anterior impacts. Bracing had no effect on the ACL strain change or kinematics under internal or external moments. Conclusion: Our results indicate that the effect of bracing during impacts depends on the direction and height of the impact and is partly positive, negative, or neutral and that soft tissue absorbs impact energy. An effect during internal or external torque was not detected. Clinical Relevance: Bracing in contact sports with many lateral or medial impacts might be beneficial, whereas athletes who play sports with rotational moments on the knee or anterior impacts may be safer without a brace.
机译：背景：即使在各种负重情况下支撑的效果仍不清楚，医生还是规定了膝关节矫正器可以保护膝盖免受运动或手术后各种负重状况的影响。目的：广泛研究支撑是否能保护膝盖免受不同高度的外侧，内侧，前部或后部方向的撞击以及胫骨力矩的影响。研究设计：受控实验室研究。方法：八只肢体标本暴露于（1）来自内侧，外侧，前部和后部方向的3个高度（关节线的中心以及上下100 mm处）的次临界冲击力，以及（2）内部/外部扭矩。使用预防性支架，两种情况均在具有中等肌肉负荷和完整软组织的支撑和非支撑条件下进行。记录并分析了前交叉韧带（ACL）应变的变化，胫骨和股骨的关节加速（仅用于撞击）以及关节运动学。结果：支撑减少了因内侧和外侧中心碰撞而引起的关节加速度。 ACL应变变化对于内侧上级冲击减小，而对于前下级冲击增大。来自后方方向的影响对ACL应变变化和关节加速的影响远小于前部影响。支撑对内部或外部力矩下的ACL应变变化或运动学没有影响。结论：我们的结果表明，撞击过程中支撑的效果取决于撞击的方向和高度，部分为正，负或中性，并且软组织吸收撞击能量。未检测到内部或外部扭矩的影响。临床意义：在有许多外侧或内侧撞击的接触式运动中撑起可能会是有益的，而在膝盖上有旋转力矩或前向冲击的情况下进行运动的运动员如果没有支撑则可能更安全。

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