Complicated pelvic fracture including sacrum bone fracture mostly displays pelvic posterior ring injuries.
复杂的骨盆骨折多数存在骨盆后环损伤，包括骶骨骨折。

Imagine that the sacrum is sinking deeper into the back of your pelvis and bring the tailbone closer to the pubis.
想像骶骨下沉进入骨盆的后侧并带着尾骨靠近耻骨。

The nutrient arteries of the lateral part of the sacrum enter the bone through its ventral, dorsal and medial aspects.
骶骨外侧部的营养动脉分别由腹侧，背侧和内侧面进入。

A diamond burr was used to make an osteotomy through the S1 pedicle and sacral ala to the anterior cortex of the sacrum.
用金刚钻从骶1椎弓根和骶骨翼到骶骨前皮质行截骨术。