2 sprains in 3 months

In January I tripped down a flight of stairs and badly sprained my ankle. I was on crutches for 2 weeks and in a cast boot for 1 month. I started PT and was responding well. However, 2 days ago I was walking down the front stairs and my ankle "let go" turning underneath me. I was unable to bear weight and my ankle starting swelling immediately. I went to the ED and was given an aircast and crutches. I was told to use the crutches for 3 days and the brace for 1-3 weeks. Is this normal treatment. Should I just follow the recommendations and see how I respond or try and make an appt with my ortho? Is it normal to resprain the ankle so soon??

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Yes it is normal to resprain your ankle.  Once you sprain an ankle, it does become weaker.  You are likely to sprain it again.  Listen to your doctor, but there would be nothing wrong with also seeing your ortho.  I don't know what shoes you were wearing, but get some sturdy, wide base, low heel shoes.  Also take care when walking down these steps.