Akgun Umut, Kocaoglu Baris, Orhan Elif Kocasoy, Baslo Mehmet Baris, Karahan Mustafa
Department of Orthopedic Surgery, Acibadem Kozyatagi Hospital, Istanbul, Turkey.
Knee Surg Sports Traumatol Arthrosc. 2008 Sep;16(9):809-14. doi: 10.1007/s00167-008-0542-x. Epub 2008 May 1.
Meniscus is a well innervated tissue with four types of receptors. These receptors are mainly concentrated at the anterior and posterior horns. Although they are intended to be a part in reflex arc, this function has not been thoroughly evaluated. We hypothesized that electrical stimulation of the normal meniscus would elicit electromyographic activity of the hamstring muscle via the reflex arc. Five adult domestic male rabbits were used in this study. Under general anesthesia, knee arthrotomy and thigh dissection were done to expose medial meniscus and semimembranosus muscle. Menisci were stimulated by Teflon-coated bipolar needle electrodes. Needles were placed in the posterior horn of the medial menisci. Two Teflon-coated monopolar needle electrodes were placed in semimembranosus muscle. A four-channel electromyograph was used for recording. Two different potentials were recorded from the target muscle. The first response had a very short distal latency and its amplitude was changing in accordance with the strength of the stimulus, suggesting that this response was being elicited by direct muscle stimulation. The second delayed response with less amplitude also appeared in some traces. The latency and the amplitude of this second response were fairly stable stating that this delayed response was being generated by a reflex pathway and seen in all subjects.
半月板是一种神经分布丰富的组织，有四种类型的感受器。这些感受器主要集中在前角和后角。尽管它们本应是反射弧的一部分，但这一功能尚未得到充分评估。我们假设，对正常半月板进行电刺激会通过反射弧引发腘绳肌的肌电图活动。本研究使用了5只成年雄性家兔。在全身麻醉下，进行膝关节切开术和大腿解剖，以暴露内侧半月板和半膜肌。用涂有聚四氟乙烯的双极针电极刺激半月板。电极针置于内侧半月板的后角。两根涂有聚四氟乙烯的单极针电极置于半膜肌中。使用四通道肌电图仪进行记录。从目标肌肉记录到两种不同的电位。第一个反应的远端潜伏期非常短，其振幅随刺激强度而变化，表明该反应是由直接肌肉刺激引起的。第二个延迟反应的振幅较小，在一些记录中也出现了。第二个反应的潜伏期和振幅相当稳定，表明这种延迟反应是由反射通路产生的，并且在所有受试者中都能看到。
