I am 16 and have been having pain in my collar bones and shoulder blades. i have arthritis in my lower back and am not sure if that is the cause?

The first order of : business is to see your pediatrician, who may refer you to a pediatric rheumatologist. A thorough history & physical, MRI of the spine, family history & molecular genetic testing all help determine the type, which determines long-term management. Juvenile Ankylosing Spondylitis is one of the disorders that affects the spine & may affect peripheral joints & non-articular (non-jointed) bones.