基于惯性传感器的反馈可以降低跳跃着陆时前交叉韧带损伤的关键风险指标。

Inertial sensor-based feedback can reduce key risk metrics for anterior cruciate ligament injury during jump landings.

机构信息

Stanford Biomotion Laboratory, Stanford, CA 94305, USA.

出版信息

Am J Sports Med. 2012 May;40(5):1075-83. doi: 10.1177/0363546512437529. Epub 2012 Mar 28.

DOI:10.1177/0363546512437529

PMID:22459239

Abstract

BACKGROUND

The incidence of anterior cruciate ligament (ACL) injury can be decreased through the use of intervention programs. However, the success of these programs is dependent on access to a skilled trainer who provides feedback; as such, these programs would benefit from a simple device with the capacity to provide high-quality feedback.

HYPOTHESIS

Feedback based on kinematic measurements from a simple inertial sensor-based system can be used to modify key ACL injury risk metrics (knee flexion angle, trunk lean, knee abduction moment) during jump landing.

STUDY DESIGN

Controlled laboratory study.

METHODS

Seventeen subjects (7 male) were tested during drop jump tasks. Their movements were measured simultaneously with inertial, optoelectronic, and force platform systems. Feedback provided to the subjects was based only on measurements from the inertial sensor-based system (knee flexion angle, trunk lean, and thigh coronal velocity). The subjects conducted a baseline session (without landing instructions), then a training session (with immediate feedback), and finally an evaluation session (without feedback). The baseline and evaluation sessions were then tested for changes in the key risk metrics.

RESULTS

The subjects increased their knee flexion angle (16.2°) and trunk lean (17.4°) after the training. They also altered their thigh coronal angular velocity by 29.4 deg/s and reduced their knee abduction moment by 0.5 %BW·Ht. There was a significant correlation (R (2) = 0.55) between the change in thigh coronal angular velocity and the change in knee abduction moment.

CONCLUSION

Subjects reduced key risk metrics for ACL injury after training with the system, suggesting the potential benefit of instrumented feedback for interventional training.

CLINICAL RELEVANCE

Interventional training for reducing the risk of ACL injury could be improved with a simple device that provides immediate feedback.

摘要

背景

前交叉韧带（ACL）损伤的发生率可以通过使用干预计划来降低。然而，这些计划的成功取决于是否能够获得提供反馈的熟练教练；因此，这些计划将受益于具有提供高质量反馈能力的简单设备。

假设

基于简单惯性传感器系统的运动学测量值提供的反馈可以用于在跳跃着陆时修改关键 ACL 损伤风险指标（膝关节屈曲角度、躯干倾斜、膝关节外展力矩）。

研究设计

对照实验室研究。

方法

17 名受试者（7 名男性）在跳下跳任务中接受了测试。他们的运动同时使用惯性、光电和力台系统进行测量。向受试者提供的反馈仅基于基于惯性传感器的系统（膝关节屈曲角度、躯干倾斜和大腿冠状速度）的测量值。受试者进行了基线测试（无着陆指导），然后是培训测试（即时反馈），最后是评估测试（无反馈）。然后测试基线和评估测试的关键风险指标是否有变化。