Larger grafts afford neural decompression through anterior column distraction, but may subject the graft and vertebral bodies to excessive loads, increasing graft fracture, and subsidence risk.
较大的植骨块通过分开前柱而使神经减压，但易使椎体与骨块承受过大的载荷，增加了植骨块骨折与下沉的风险。
Basin subsidence, uplift, fracture are geologic trace formed by stress state with different characters.
盆地沉陷、隆起、断裂构造等都是不同特点的应力状态作用下的地质痕迹。
It is showed that:(1)the major surface damage patterns due to grinding are microplastic deformation trace, fracture chipping pit, microcracks, and subsidence in the loosen region of material;
结果表明：磨削损伤的主要形式有显微塑性变形磨痕、断裂剥落坑、磨削微裂纹和材料疏松区的塌坑；
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