I've had this for over a year as well, and have had to sit out for most of the past six months. Antinflamitories didn't do much but mask the pain for a couple of weeks. Rest alone wasn't enough. Icing helped some.
Things were looking pretty bleak, but six weeks ago I started PT, and have made some progress. The principles behind the PT were straightforward: 1) reduce inflamation, 2) break up scar tissue, 3) strengthen the tendon and muscles, 4) ease into running. You can't skip a step. If you do, you are back to square 1.
Reducing Inflamation:
Ultrasound with steroid ointment 2 X week
Icing every day, maybe twice. Use ice massage rather than passive ice pack.
Rest. Cycling is okay (high rpm--low gear--rather than power strokes, however)
Breakdown Scar Tissue:
Massage every day for two minutes. Use two fingers across tendon and rub back and forth fairly vigorously.
Ice massage across tendon.
Stretch quads (not hurdler stretches, however)
Strengthen Tendon and Muscles
After about 2 weeks of the above, I started doing knee dips to strengthe quad and tendon. Stand on 4" platform and bend knee until heel of opposite foot touches ground. (2 X 15 reps).
After 1 week of the dips I started jumping off the 4" platform and landing on both feet. Land on toes with knees flexed so quads take the brunt of the impact. (think light!) 1 X 10 reps/day
(at the PT office I used their rollerboard 1 or 2X week)
Easing into Running
After about 3 weeks of strengthening, I eased into running. Every other day; increase by about 2 minutes each time. Once the swelling and scar tissue is out, the running supposedly helps the healing process. I am now at 20-25 minutes 3X week. Will build to 30 min, and hold there for another month or two. Hopefully by then I will be able to gradually increase mileage and then intensity. I'm cutting back on the leg excersises to 2X week, and am focusing on hamstring stretches, because those tendons are getting tight after the long layoff.