Hi
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Sudden onset knee pain can be due to ligament tear, bursitis, meniscus injury or due to dislocation of patella. Any injury or inflammation can cause bleeding from fragile capillaries and this may appear as a bruise. Please consult an orthopedic specialist.
Hope this helps. Take care!
for 3 years now i have had server kneepain it started in my knees then my ankals a now my hand i cry with pain it that bad i have had blood test xrays mri scan for arthariters and there come back clear am 34 year old i have vitomon d prob my doc says it is prob stress but i know in my heart it is not my bones klick and feel like there grinding togeter when i touch them i cant get up and down the stairs with no help and in the bath i am fed up and just want to know what is wrong with me so i can the help and sugestions please as i lost hope in my doctors