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对260个骶骨的上关节突外侧沟作了观察,以它和上关节突关节面下缘的关系分成四型。其中Ⅰ型(钩绕型)占26.2％.对上关节突关节面的位置、形态和不对称性作了统计;并在15侧尸体上观察了我五腰神经后内侧支的走行特点。指出第五腰神经后内侧支在Ⅰ型外侧沟中有可能被第五腰椎下关节突压榨引起腰骶部疼痛。
The lateral sac of the sacrum was observed in the lateral ditch of the sacrum, which was divided into four types according to its relationship with the inferior border of the superior articular process. The type I (hooked type) accounted for 26.2% .The location, shape and asymmetry of the articular surface of the superior articular synapses were counted, and the walking characteristics of the posterior medial branch of the five lumbar nerves were observed on 15 corpses. It is pointed out that the posterior medial branch of the fifth lumbar nerve may be lumbosacral pain caused by the fifth lumbar facet joint compression in the lateral groove of type Ⅰ.