Cold foot after knee injury

Patient : I went skiing yesterday and slipped on ice and fell on my knee. It immediately started swelling, and after coming back home I went to the emergency room. I underwent medical examination and x-ray, and the doctor did not find anything that indicated that I had broken anything, so I was sent home. Today, however, my right foot (i fell on my right knee) feels colder than my left foot. Should I go to the ER?
Symptoms:  Swelling knee
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