falling down

Today turned out to be a strange and painful day. Was suppose to go in AM to do water aerobics with friends. It was such a nice morning I changed my mind and went for a walk around the lake (about 3 miles) about 3/4 done, I'm walking and all of the sudden lose control and my balance and land on the pavement flat down. I remember when I was starting to go down that I did try and correct my balance and thinking to myself what is going on.
I did manage to get myself up and looking at the ground and then seeing what happened. Because of all the storms we have been having there was debris of twig small branches etc.. I did not see this before. I guess I must have stepped just right on a branch and it rolled?? and I lost control.
bleeding from my elbows and my one knee hurting, I did manage to get home and then call the hubby, he was not far away so he did come home and take me to emergency room at hospital. before he got home I knew that my knee was nt good when I had much pain going up stairs.
Good news is that the knee had no fracture or anything broken. I'm in an immobilizer for a few days and will have to keep off the feet for a few days.
It hurts to bend the knee but that will heal.
Guess I should have gone to Water Aerobics class.