1. Bessant R, Keat A (2002) How should clinicians manage osteoporosis in ankylosing spondylitis? J Rheumatol 29:1511–1519
2. El Maghraoui A, Borderie D, Cherruau B, Edouard R, Dougados M, Roux C (1999) Osteoporosis, body composition, and bone turnover in ankylosing spondylitis. J Rheumatol 26:2205–2209
3. Mitra D, Elvins DM, Speden DJ, Collins AJ (2000) The prevalence of vertebral fractures in mild ankylosing spondylitis and their relationship to bone mineral density. Rheumatology (Oxford) 39:85–89
4. Will R, Palmer R, Bhalla AK, Ring F, Calin A (1989) Osteoporosis in early ankylosing spondylitis: a primary pathological event? Lancet 2:1483–1485
5. Karberg K, Zochling J, Sieper J, Felsenberg D, Braun J (2005) Bone loss is detected more frequently in patients with ankylosing spondylitis with syndesmophytes. J Rheumatol 32:1290–1298