家兔环杓关节实验性损伤后声门形态及声带肌组织学观察

Glottal configuration and histological findings in vocal muscles following trauma to cricoarytenoid joint

了解环构关节损伤是否伴喉内肌病理改变。方法：对家兔一侧环杓关节进行钝性损伤实验，观察不同时期声门形态及声带肌组织学改变。结果：环构关节损伤导致声门运动障碍６个月后，患侧声门出现声带位置外移、边缘不平、声门裂增宽等形态改变。组织学证实声带肌呈肌纤维直径缩小、粗细不等、间距增宽等肌萎缩病理改变。损伤９个月后，声带肌肌萎缩更明显。结论：这种继发于环构关节损伤后的声带肌肌萎缩病理变化是使声门形态改变、声带外移的原因，可加重声门闭合不全，影响预后，且有可能影响喉内肌肌电反应。

Objective:The unilateral cricoarytenoid joints of the rabbits were traumatized bluntly to investigate the changes of glottal configuration and histology of the vocal muscles. Method: 10 New Zealand white rabbits divided into 4 groups were studied. Under direct laryngoscope,the unilateral cricoarytenoid joint of each rabbit was traumatized bluntly. The glottal configuration and histology of the true cords demonstrated atrophy of thevocal muscles. The remarkable atrophy of the vocal muscles was evaluated after 1, 3, 6 and 9 months. Result :In 1and 3 months after trauma,the glottal configuration of the rabbits showed no difference from that in the period oftrauma. The histology of the vocal muscles was approximately normal. The lateral drift and deformity of the fixedvocal cord and wider glottal gap were seen 6 months after trauma. The histological sections of the vocal muscleswere noted 9 months after trauma. Conclusion:The atrophy of the vocal muscles may occur 6 months after trauma to cricoarytenoid jonint. This pathologic change may cause the lateral displacement and deformity of the vocalcord,which increases the glottal incompetence and affects voice recovery. The laryngeal electromyography may beinfluenced by the pathologic changes of the vocal muscles.