Self-reported giving-way episode during a stepping-down task: Case report of a subject with an ACL-deficient knee
Self-reported giving-way episode during a stepping-down task: Case report of a subject with an ACL-deficient knee
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DOI：
10.2519/jospt.2003.33.5.273
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发表时间：
2003-05-01
影响因子：
6.1
通讯作者：
Yack, HJ
中科院分区：
文献类型：
--
作者：
Houck, J;Lerner, A;Yack, HJ
研究设计：病例报告目的：描述膝关节前交叉韧带（ACL）缺陷受试者的膝关节相对于其非屈服试验和健康受试者的屈服试验的膝关节运动学和力矩。背景：屈服事件被认为会损害关节结构，因此治疗的目的是防止屈服事件，但很少有研究记录屈服事件。将一名ACL缺陷的32岁男性受试者在逐步下降任务期间经历的让步试验与他的非让步试验（n = 5）和健康受试者的数据（n = 20）进行比较。将在60 Hz下收集的位置数据与在300 Hz下收集的人体测量数据和地面反作用力数据相结合，以估计膝关节位移和三维角度以及净关节力矩。从4%到32%的姿态，在18%的姿态下达到9.0 mm，而非让步试验为1.6 +/- 0.7 mm。在4%的站立位后，退让试验的膝关节屈曲角度比非退让试验高6.6度，并且与较高的膝关节伸展力矩相关。膝关节额状面的时刻是近中性的早期立场的让路审判相反的非让路和健康的科目，表现出一个膝盖外展moment.Conclusions：这个主题的反应让路事件表明，更高的膝关节屈曲角度可能会提高膝关节的稳定性，并在反应让路事件，膝关节伸展的时刻可能会增加。
Study Design: Case report.Objective: To describe the knee kinematics and moments of a giving-way trial of a subject with an anterior-cruciate-ligament- (ACL) deficient knee relative to his non-giving-way trials and to healthy subjects during a step-down task.Background: Episodes of giving way are believed to damage joint structures, therefore treatments aim to prevent giving-way episodes, yet few studies document giving-way events.Methods: The giving-way trial experienced by a 32-year-old male subject with ACL deficiency during a step-down task was compared to his non-giving-way trials (n = 5) and data from healthy subjects (n = 20). Position data collected at 60 Hz were combined with anthropometric data and ground reaction force data collected at 300 Hz to estimate knee displacement and 3-dimensional angles and net joint moments.Results: The knee joint displacement was higher during the giving-way trial: from 4% to 32% of stance, reaching 9.0 mm at 18% of stance as compared to 1.6 +/- 0.7 mm for the non-giving-way trials. After 4% of stance, the knee flexion angle of the giving-way trial was 6.6degrees higher than the non-giving-way trials and was associated with a higher knee extension moment. The knee frontal plane moment was near neutral during early stance of the giving-way trial in contrast to the non-giving way and healthy subjects which demonstrated a knee abduction moment.Conclusions: The response of this subject to the giving-way event suggests that higher knee flexion angles may enhance knee stability and, in reaction to the giving-way event, that knee extension moment may increase.