椎弓崩裂 Scotty Dog Sign
在斜位片上，正常椎弓附件投影象一“猎狗”形。狗嘴表示同侧横突、狗耳朵为上关节突、眼睛为椎弓根的纵切面、狗颈即为峡部，当峡部不连时，在狗颈（椎弓峡部）处，可见一带状的裂隙，通俗称狗脖子带“项链”，椎弓为“狗的体部”，同侧和对侧的下关节突似“狗的前后腿”，对侧横突为“狗的尾巴”。
Scotty Dog Sign:The parts of the dog are as follows: the transverse process-the nose; the pedicle-the eye; the pars interarticularis-the neck; the superior articular facet-the ear; the inferior articular facet-the front leg. A break in the neck of the dog, or a dog collar, corresponds to a fracture in the region of the pars interarticularis, which is specific for spondylolysis. It is important to recognize as it is a cause of low back pain.
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