facet joint arthropathy l5 s1l5 s1 arthropathyexercise for l5 s1sciatica l5 s1 exercisesl5 s1 herniation exerciseslumbar spine l5 s1 exerciseslower back pain l5severe facet hypertrophy l5 s1exercises to relieve l5 s1 compressionl5 s1 degenerative disc exercisesl5 s1 disc protrusion exercisesl5 s1 herniated disc exercises