There were several major types of fractures of the volcanic rock reservoirs: primary fracture and secondary fracture.
本区火山岩油藏的裂缝类型主要有以下几种：原生裂缝和次生裂缝。
The duration between primary and secondary fracture were 16.6 months(8 to 47 months), all the primary fractures healed clinically.
再骨折发生时间在内固定后平均16.6个月（8～47个月），原骨折均已临床愈合。
Placement of an anteroposterior lag screw can also be complicated by screw traffic if there are a large number of screws fixing the primary fracture.
如果对骨折进行大量前后位固定的话，螺钉的位置安置也是问题。
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