Abstract：
The objective of the study is to determine the role of Lateral Pterygoid Muscle LPM in the articular disc displacement ADD, which is considered controversial due to the variations in the pattern of insertion of the Superior Lateral Pterygoid Muscle SPLM.
It is well understood that the superior head of the lateral pterygoid muscle has only a single insertion pattern among individuals, in which the muscle is attached to the articular disc and capsule. However, recent findings in many studies have shown a noticeable variation in the insertion pattern of the upper LPM.
MRI examinations were collected at King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia. Scans of 61 patients (41 females, 20 males; mean age 33 years old) with symptoms of temporomandibular dysfunction were reviewed retrospectively. The direction of their articular disc displacement was evaluated through sagittal and coronal views in both open and closed mouth positions.
There was no statistical significance found between the LPM attachment types and TMJ disc position. The chi-square test also showed no significant difference between the type of LPM attachment and the condylar location. Forty-five percent of the articular discs were located between the articular eminence and the glenoid fossa. The majority of the disc displacement was in the anterior direction.
There was no statistically significant association found between the type of LPM attachments and the direction of disc displacement.
It is well understood that the superior head of the lateral pterygoid muscle has only a single insertion pattern among individuals, in which the muscle is attached to the articular disc and capsule. However, recent findings in many studies have shown a noticeable variation in the insertion pattern of the upper LPM.
MRI examinations were collected at King Faisal Specialist Hospital & Research Centre, Riyadh, Saudi Arabia. Scans of 61 patients (41 females, 20 males; mean age 33 years old) with symptoms of temporomandibular dysfunction were reviewed retrospectively. The direction of their articular disc displacement was evaluated through sagittal and coronal views in both open and closed mouth positions.
There was no statistical significance found between the LPM attachment types and TMJ disc position. The chi-square test also showed no significant difference between the type of LPM attachment and the condylar location. Forty-five percent of the articular discs were located between the articular eminence and the glenoid fossa. The majority of the disc displacement was in the anterior direction.
There was no statistically significant association found between the type of LPM attachments and the direction of disc displacement.
摘要：
该研究的目的是确定翼状外侧肌LPM在关节盘移位ADD中的作用，由于上外侧翼状肌SPLM插入模式的变化，这被认为是有争议的。
众所周知，翼外肌的上头在个体中只有一个插入模式，其中肌肉附着在关节盘和关节囊上。然而,许多研究的最新发现表明，上LPM的插入模式存在明显差异。
在费萨尔国王专科医院和研究中心收集了MRI检查，利雅得,沙特阿拉伯。扫描61名患者（41名女性，20名男性；平均年龄33岁），有颞下颌关节功能障碍症状。通过张开和闭口位置的矢状和冠状视图评估其关节盘移位的方向。
在LPM附着类型和TMJ椎间盘位置之间没有发现统计学意义。卡方检验也显示LPM附着类型和髁突位置之间没有显着差异。45％的关节盘位于关节隆起和关节盂窝之间。椎间盘移位的大部分是向前方向。
在LPM附件的类型和椎间盘位移的方向之间没有发现统计学上的显着关联。
众所周知，翼外肌的上头在个体中只有一个插入模式，其中肌肉附着在关节盘和关节囊上。然而,许多研究的最新发现表明，上LPM的插入模式存在明显差异。
在费萨尔国王专科医院和研究中心收集了MRI检查，利雅得,沙特阿拉伯。扫描61名患者（41名女性，20名男性；平均年龄33岁），有颞下颌关节功能障碍症状。通过张开和闭口位置的矢状和冠状视图评估其关节盘移位的方向。
在LPM附着类型和TMJ椎间盘位置之间没有发现统计学意义。卡方检验也显示LPM附着类型和髁突位置之间没有显着差异。45％的关节盘位于关节隆起和关节盂窝之间。椎间盘移位的大部分是向前方向。
在LPM附件的类型和椎间盘位移的方向之间没有发现统计学上的显着关联。
