Nagai Takashi, Bates Nathaniel A, Hewett Timothy E, Schilaty Nathan D
Biomechanics Laboratories, Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, United States; Sports Medicine Center, Mayo Clinic, Rochester, MN, United States.
Biomechanics Laboratories, Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, United States; Sports Medicine Center, Mayo Clinic, Rochester, MN, United States; Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, MN, United States.
Clin Biomech (Bristol). 2018 Jun;55:40-44. doi: 10.1016/j.clinbiomech.2018.04.011. Epub 2018 Apr 14.
Anterior cruciate ligament injury can disrupt one's mechanoreceptors and result in decreased proprioception such as joint position sense and ultimately altered motor function. The application of localized vibration has been used to investigate the integrity of the sensorimotor system and the mechanisms of quadriceps function after anterior cruciate ligament injury and reconstruction. The purpose of the study is to evaluate joint position sense with and without vibration and compare among anterior cruciate ligament reconstructed, contralateral, and control limbs.
Fourteen subjects with anterior cruciate ligament reconstruction (8 males and 6 females) and fourteen control subjects (7 males and 7 females) participated in the study. Subjects sat on an isokinetic dynamometer chair with localized vibration strapped on the quadriceps tendon while visual and auditory cues were removed. Subjects were asked to remember an active target position and replicate that position actively. The absolute difference between the target and replicated trial was used as joint position sense. There were three trials at three target positions (15, 45, and 75 degrees of knee flexion) with and without vibration. The order of testing conditions was randomized. One-way analysis of variance or non-parametric equivalent (Kruskal-Wallis test) was used to compare among limbs. Significance was set at P < 0.05 a priori.
There were no significant joint position sense differences among anterior cruciate ligament reconstructed, contralateral, and control limbs with or without vibration (P = 0.207-0.914).
There are several potential reasons for the current findings: vibration-induced post effect, locations of vibration, types of vibration, and rehabilitation status. Future studies should expand the current investigation and explore both sensory and motor functions in anterior cruciate ligament reconstructed subjects.
前交叉韧带损伤会破坏机体的机械感受器，导致本体感觉下降，如关节位置觉，最终改变运动功能。局部振动的应用已被用于研究前交叉韧带损伤和重建后感觉运动系统的完整性以及股四头肌功能的机制。本研究的目的是评估有无振动时的关节位置觉，并在前交叉韧带重建肢体、对侧肢体和对照肢体之间进行比较。
14例接受前交叉韧带重建的受试者（8例男性和6例女性）和14例对照受试者（7例男性和7例女性）参与了本研究。受试者坐在等速测力计椅上，股四头肌腱上绑着局部振动装置，同时去除视觉和听觉提示。要求受试者记住一个主动目标位置并主动复制该位置。目标试验和复制试验之间的绝对差值用作关节位置觉。在三个目标位置（膝关节屈曲15°、45°和75°）进行有无振动的三次试验。测试条件的顺序是随机的。采用单因素方差分析或非参数等效方法（Kruskal-Wallis检验）对肢体进行比较。显著性设定为P<0.05。
在前交叉韧带重建肢体、对侧肢体和对照肢体之间，无论有无振动，关节位置觉均无显著差异（P=0.207-0.914）。
目前的研究结果有几个潜在原因：振动诱发的后效应、振动位置、振动类型和康复状态。未来的研究应扩大当前的调查范围，探索前交叉韧带重建受试者的感觉和运动功能。
