What factors are important in determining the length of the imitation lag and the length of the demand lag? Explain.
在决定模仿滞后和需求滞后的长度时，哪些要素起着重要的作用？请解释。
Objective: To study the best entry points, direction and length of screw in acetabular anterior column lag screw technique.
目的：研究髋臼前柱拉力螺钉内固定技术中螺钉的最佳进钉点、方向和长度。
Objective: To study the best entry points, direction and length of screw in acetabular anterior column lag screw technique.
目的：研究髋臼前柱拉力螺钉内固定技术中螺钉的最佳进钉点、方向和长度。
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