Bursitis, Tendonitis, Arthritis & Trigger Points
One more thought. Often, trigger points in the muscles can refer pain to the joints and mimick bursitis, tendonitis and arthritis. A great book is the "The Trigger Point Therapy Workbook" second edition, by Clair Davies. Whenever a client reviews any of the above conditions, I reference the book to see which muscles might be the cause. I'm amazed by how often massage relieves the pain. Here's a link to more information: http://www.triggerpointbook.com/tendinit.htm