I am suffering from subacromial bursitis. This diagnosis was made on April 12, 2010 following an injury on April 6, 2010 to my shoulder. I received trigger point injections on April 12 and May 10, 2011. On June 7, 2010, I underwent an arthrogram to the right shoulder that was unremarkable. Did the trigger point injections for two consecutive months prior to the artrogram play any part in the normal arthrogram? I am still treating with physical therapy, meds and trigger point injections. Thank you for your opinion.