Osteoporosis is common in AS, but is that due to the disease process, or the drugs we use??

BMD = Bone Mineral Density. A low BMD indicates osteoporosis... here is the medical journal abstract:

After investigating 30 people with Ankylosing Spondylitis, average age of 37 years, a group of researchers found the following:
"lumbar spine showed osteopenia or osteoporosis in 50% of the patients, while 86% had osteopenia or osteoporosis in the total proximal femur. When compared with the normal population, the patients showed a significant BMD decrease in the lumbar spine and total proximal femur with sub-regions (Clin Rheumatol 1999;18(5):364-8) "
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10524549&dopt=Abstract

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"Some men, in truth, live that they may eat, as the irrational creatures, 'whose life is their belly, and nothing else.' But the Instructor enjoins us to eat that we may live." -- Clement of Alexandria (about 200 AD)