Persistent Low Back Pain

Tai chi exercise for treatment of pain and disability in people with persistent low back pain: A randomized controlled trial http://onlinelibrary.wiley.com/doi/10.1002/acr.20594/full

Long-Term Low Back Pain

A randomized controlled trial of tai chi for long-term low back pain (TAI CHI): Study rationale, design, and methods http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2702312/

Ankylosing Spondylitis

Tai Chi for Disease Activity and Flexibility in Patients with Ankylosing Spondylitis—A Controlled Clinical Trial http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2586320/