Hello, and thanks for your medical question on E Health Forum. I am glad that I can help you.
Falling on ice due to sudden loss of balance can cause many people to have severe injuries including that of the back and the pelvic bones.
The best way to deal with situations with minor injuries is adequate rest and OTC analgesics.
In case the pain is severe and disability to walk either due to weakness or associated severe pain, evaluation with X rays to look for any fracture of the bones would be necessary.
Crutches can be used by anyone who has difficulty to walk, but the actual need depends on the degree of injury, and that can be determined by a physical examination.
You might consider to consult your doctor for a physical who can evaluate you and help you accordingly.
I hope this helps.