[QUOTE 4702508, member: 9609"]do you get much bother out of yours ? I have to be careful doing jobs on my hands and knees (good knee pads are essential). Apart from that if I stay fit and strong and do my knee exercises they are no problem, let them get weak and they can be a right pain, literally.[/QUOTE]
On and off and in the last few years after doing some damage running, a lot. A long ride or a mtn walk will set it off aching badly. Even a few days building a gate in the back garden has set it off. I tend to always be aware of it now and am consciously managing it and evaluating how much activity versus rest I can get away with. Working the muscles around it with a roller or stretching really helps. When it's really bad, actually moving the patella around my knee is beneficial.
My son has a bipartite patella too and he too is getting pain from it. Undoubtedly set off by the level of exercise he does, so it's probably off to a specialist to see if anything can be done. They can pin them or cut tendons to take the strain off the join.
With apologies to jefmcg for the diversion.