This is not really a disease at all but an inflammation of the tibial tubercle (the bump just below the front of the knee). It typically happens in young teens who are athletic or involved in sports.
Treatment used to be rest and anti-inflammatory drugs. This can be very disappointing for the young athlete.
Happily this is one of the few conditions where we can say that 100% of those treated get better quickly.
Simply take full spectrum vitamine E and selenium daily. The dose is one tri-enol or toco-3-nol (this is complete vitamin E) daily with 200 micrograms of selenium. Typically this would be one full capsule of vitamin E.
Unfortunately nothing but alpha-tocopherols can be listed as so many iu. Vitamin E is a number of different tocopherols just like the B vitamins are all different. It is best to take the complete vitamin E. Normally within 2 to 3 weeks the pain is gone. Occasionally it takes longer but it always works.