X-ray taken of left knee, difficulty positioning right leg over left, felt pain and discomfort in right groin, large bruising appeared in groin. So much pain in the groin, went from walking perfectly to using a wheelchair and walker. 1 1/2 year later , right thigh remains swollen and I am unable to walk without right leg pain. What could have caused this problem.? Bruising dissipated slowly over about 6 to 8 months.