Mom's Surgery

A couple of weeks ago I mentioned that my mom was hurt while skiing. She tore her ACL (had to look it up... anterior cruciate ligament).
Well today she had her surgery. Dad said it went well, the doctor was able to repair the tear. The surgeon said this was a common ski injury.
My dad worries that she'll go back and get hurt again. I'm sure she'll go back and I'll just have to pray she doesn't get hurt.