Key words: chronic nonspecific low back pain, magnetic resonance imaging, disc degeneration, high intensity zone, endplate changes, bulging disc, exercise therapy, outcome.

• 关键词：慢性非特异性下腰痛；磁共振成像；椎间盘退变；高信号带；终板改变；椎间盘膨出；运动疗法；疗效。