I have Psoriatic Spondylitis snd was diagnosed via MRI with moderate bilateral sacroilitis with sclerosis over full length of both joints, 3 bulging lumbar discs with 27 degree scoliosis as well as half inch lumbar-sacrum listhesis, and hip arthritis about 10 years ago at the age of 49. I went to an outstanding physical therapist who taught me several exercises to do to support and strengthen the area which i have been doing approx 4 days a week ever since. I significantly improved my diet to increase nutrient and protein intake. According to an MRI update i had last month, all of the arthritis is gone and my lumbar is straight. The bulging discs are still there, but the sclerosis is gone. I don't know if that can be done in the 70s, but according to a 90 year old friend of mine, "you dont know what you cant do until you try".