I have symptoms at my right sterno-clavicular joint , where the ligaments connect the sternum and clavicle , a kind of protrusion.I had an x-ray and MRI two weeks ago. The result, according to my doctor is some kind of arthritis erosion, and suggested to hill soon. I am regularly exercising in a gym, and run about 15-20 miles per week. The symptom, and the protrusion is still there. Any help is appreciated.