 [ Symptoms ] i have on going dull knee pains for over two years [ Disease ] in my opinion hemochromatosis + dancing repetitive jumping can cause meniscal injury described as ballon in knee can not fully flex or extend  can explain your knee hemochromatosis alone can explain the rest of your jointsi recommend a knee mri to confirm also focus on avoiding iron and vitamin c in diet start therapeutic phlebotomy every 2 month or you can try iron chelation therapy less effective less evasive good luck