Spondylo arthrosis includes 1 . Ankylosing spondylitis 2 . Reiter ’s disease 3 . Reactive Arthritis 4 . Psoriatic arthritis 5 . Juvenile rheumatoid arthritis (JRA ) 6 . Inflammatory bowel disease L5 sacralization is a common anatomical anomaly, where usually the L5 vertebral body becomes incorporated into the S1 vertebral body. It is a common finding in the general population, and is a benign process...Consult nearest orthopedic surgeon they will do the needful.