National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) 
One of the research institutes of the National Institutes of Health (NIH). Publications, information about grants and clinical trials, meeting notices, and general information about the Institute and its work.
http://www.nih.gov/niams/Musculoskeletal Disorders 
Information on prevention of occupational injuries and pain.
http://www.hse.gov.uk/msd/
Upper Extremity Musculoskeletal Disorders 
Clinical guidelines and evidence for management.
http://www.guideline.gov/summary/summary.aspx?view_id=1&doc_id=3694
eMedicine Health - Bone, Joint and Muscle 
Information on range of musculoskeletal disorders.
http://www.emedicinehealth.com/collections/SU293.asp
Joint Pain Info 
Includes definitions, illustrations and resources to explain hip, shoulder, knee and back pain.
http://www.jointpaininfo.com/
Bones and Joints Simplified 
Information about bones and joints diseases and conditions. Contains drug database, related tests and procedures and community support listings.
http://www.bonesandjointssimplified.com
eMedTV Bone Channel 
Includes in depth medically written and reviewed articles and interactive videos that cover basic bone health, avascular necrosis, achondroplasia, ACL surgery and the risks benefits and complications.
http://bones.emedtv.com/