<s>[INST] Ive had back pain for 40 days.  MRI shows disc protusion L3, L4 with no nerve involvement, L5 S1 disc protusion with minimal displaced nerve root.  I have severe low back pain when sitting and driving.  Minimal leg/hip pain.  My question is about my thigh shaking when I walk down stairs, feels weak like it will give out, is this related to disc problem? [/INST] Hi,It seems that you might have stiff back due to osteoartheris changes in your lumbo-sacral vartebrae giving problem of backache and problem while driving.Go for physiotherapy daily and regularly.Do back extension exercise.Use hard bed for sleeping.Ok and take care. </s>