典型的退变性椎间盘疾病从椎间盘壁小的撕裂开始。椎间盘壁称为纤维环。
Degenerative disc disease typically begins when small tears appear in the disc wall, called the annulus.
退变性椎间盘疾病导致的疼痛可源于椎间盘本身，或由脊柱生物力学的改变而产生。
Pain from degenerative disc disease can originate in the disc itself, or come from changes in the biomechanics of the spine.
退变性椎间盘疾病，简称% DDD，作为正常老年化过程的一部分，发生于很多人。
Degenerative Disc Disease, or DDD, occurs in many people as part of the normal aging process.
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