Experimental study of Holmium-YAG Laser application for TMJ arthroscopy

本研究的目的是通过实验探讨holum - yag激光在TMJ关节镜中的应用效果。采用家兔关节组织进行热、病理组织学实验研究。关节内温度检查：在兔膝关节腔内置入关节镜和体温计探头。探头尖端经关节镜置于视野内。通过关节镜的工作通道将激光传输光纤引入关节腔。记录照射后关节内温度升高情况。在2.5J时，温度几乎没有升高。组织病理学检查：兔膝关节关节囊打开。照射股骨髁关节软骨和半月板。照射后，立即取出照射后的股骨髁和半月板，苏木精和伊红染色。光镜下对照射部位进行组织病理检查。2.5J处半月板烧蚀坑深度为0.75mm。股骨髁上的擦伤坑通过约0.3mm厚度的关节软骨到达软骨下骨。

The porpose of this study is to investigate experimentally the effectiveness of the Holmum-YAG laser application for TMJ arthroscope. The thermal and histopathological investigation were made experimentally using articular tissue of the rabbit joint.Intra-articular temperature examination :The arthroscopic and a dedital thermometer probe were inserted into the articurar cavity of rabbit knees. The tip of probe was placed within the visual field by the arthroscope. A laser carrying fiber was introduced through the working channel of the arthroscope into the articular cavity. The intra-articular increse in temperature by irradiation was recorded. There was almost no increase in temperature at 2.5J.Histopathological examination :The articular capsules of the rabbit knees were opend. The articular catilage of the femoral condyle and the meniscus were irradiated. After irradiation, the irradiated femoral condyle and meniscus were removed immudiately, staind with hematoxylin and eosin. The histpathological examination of irradiation sites was carried out by light mucroscope. The ablation crater in meniscus at 2.5J was 0.75mm in depth. The abration crater in the femoral condyle reached the subcartilaginous bone through articular cartilage of about 0.3mm thickness.