What Is The Numbness In Leg After A Fall?

i fell on some ice almost three weeks ago now, it didnt really swell or bruise all that much, however, approximately 10hrs after the fall, my knee went numb. The following morning the numbing began to slowly travel the entire length of my leg to my foot, and up the inside of the thigh, and has been numb ever since. The affected leg is slightly cooler to the touch and just a slight shade different color. Now tonight the nail of the "big toe" fell off....just like that!