Got this in both knees, been doing rehab for seven weeks which includes cycling every other day on the turbo but its really light and looks like its going to take months to fully get over. (Most things I have read say 3-6 months plus the time you trained through it). I pushed through for a good six weeks before deciding I should do something about it, as a consequnce have had to drop out of LEL, cycling trip to italy and several events this summer.
also read the Martin Koban stuff, most of it is summarised in this:
Patella rehab infographic
Physio has me doing lots of limited range squats, started with body weight, just introduced weighted, lots of rolling my quads with a massage stick, cycling every other day and some hamstring and glute activation activities.
He blames it on poor cleat set up and over active quads. Also has got me to start using knee savers/ pedal extenders to allow a more natural foot position on the bike. The other major factor was rapidly ramping up my training and physio has made clear that training through winter is a must if I expect to be able to train hard in spring so that the tendon maintains condition.
Watched this last night and is similar to what I have been given to do, everything I have read says to do and shows rehab does work. Think he probably got over it quicker due to his fitness and youth.