NuNeez519
member
I experience the same "unstable" feeling in my non TKR (left) knee. My knee goes out like the way you had described. I was told his was from a torn ACL which is what holds the knee joint together. It happens to me on flat ground as well as going DOWN the stairs. This is one reason I had started my TKR surgery process. It is a horrible feeling knowing you can "go down" a any time.
NN
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