Bad car accident in 2001,damage to both knees ,yrs later tests shows white masses in knees and woken nighlty with severe inner knee pain so bad i can't straighten it or move my leg until i get past the sharp pain, what can be happening?

Post traumatic arthr: Injury recovery by the body tends to produce advanced ‘aging’ of affected joints. This is most likely your situation. A PMR or Ortho doc can best assess your situation and offer topical, oral, invasive options as well as physical therapy. X rays will,be helpful,to determine I’d your normal range of motion is limited by degenerative changes.