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Phase One. The goal of phase one is to reduce swelling and pain. This phase can last between one and seven days after your ankle sprain. Rest, applying ice and wearing an elastic bandage during this time is necessary. For grade III ankle sprains, wearing a walking boot or using crutches is also necessary.
Jupiterimages/Creatas/Getty Images. Recovery time for ankle injuries varies based on the severity, but for a grade 2 sprain requiring crutches, it will typically take 5 to 10 weeks until the joint is fully healed. You will want to use crutches for the first 4 to 8 weeks, longer if your doctor recommends to. For a grade 3 sprain, the joint may be unusable for 3 to 6 months and perhaps longer if the injury is serious. Crutches become absolutely necessary for the entirety of the healing process for an injury of this severity.