why is it that a tendon is a tendon but when it gets inflamed it becomes a tendin? As in "tendinitis"? --I think "tendonitis" is a much more logical spelling, don't you?

BTW, I heartily recommend The Sports Medicine Bible by Dr. Lyle J. Micheli, M.D. GREAT BOOK for the home exerciser to self-diagnose and self-treat with, or to understand why and when it's important to see a professional.