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对１５０侧颞下颌关节断屈片，采用主观判定法、线性测量法、坐标纸直接判定法、面积测定法等４种方法进行测量，确定髁突和关节盘位置，并和相应的造影断层片作对照分析。结果表明，断层片上用髁突位置变化作为判断关节盘移位的预测指标有一定的局限性，有较多假阴性结果，但假阳性结果较少。提示当断层片上示髁突明显后移位时，关节盘前移位可能性很大，髁突居中或前位时不能排除关节盘移位，其中仍有较多数量的关节盘前移位。关节造影是Ｘ线诊断关节盘移位最佳诊断方法。
The abduction and flexion of temporomandibular joint in 150 sides were measured by four methods: subjective judgment, linear measurement, direct paper determination and area measurement. The condylar and disc positions were determined and compared with the corresponding contrast tomography As a control analysis. The results showed that the use of condylar position changes on the slice as a predictive index of dislocation of the disc has some limitations, there are more false negative results, but less false positive results. Prompted that when the condyles on the tomographic showed significant post-shift, the possibility of anterior disc displacement is very large, condylar center or anterior position can not rule out the displacement of the articular disc, in which there are still a greater number of anterior disc displacement. Joint radiography is the best diagnostic method of X-ray diagnosis of disc displacement.