Other Medical References
MedlinePlus: http://www.nlm.nih.gov/medlineplus/bonesjointsandmuscles.html
OrthoInfo: http://orthoinfo.aaos.org/menus/arthritis.cfm http://testyoc.aaos.org/topic.cfm?topic=A00672
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) http://www.niams.nih.gov/Health_Info/Bone/Additional_Bone_Topics/
WebMD: http://www.webmd.com/back-pain/surgery-disc-replacement-fusion
North American Spine Society (NASS) http://www.knowyourback.org/Pages/BackPainPrevention/Default.aspx
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