Thank you..I have had bursitis and that is so painful!! I had it in my shoulderblade area and I had to use Medrol to get the inflammation to go down so I don't think it is bursitis, but I do think it is overuse as you mentioned.
if anybody in blood relation is suffering from any genetic disease like RA etc. they should be very careful about the growth of their own children. now in this case where an eleven yrs old girl is suffering from knee swelling, the first and foremost thing is to go for blood test, which can clarify wether its RA or not,second thing would be uric acid,because if uric acid is more it can cause swelling in joints specially in lower limb,so diabeties also have to be checked.