We have previously shown in large cross-sectional MRI studies that lumbar DD manifests earlier and in a greater percentage of subjects with LBP than asymptomatic controls.

• 前面，我们已经通过大型的横断面研究显示，腰椎间盘变性出现比较早，并且在下腰痛的受试者中出现的比率比无症状对照组中大。