Calling, FReeper 911... Fell off horse, cannot bend knees...
Really, is that what injured your knees. So sorry to hear that.
I have had knee surgery on both knees, but — thank God! — I can still genuflect. Not fast, and I need to grab something to get up, but I can still do it.
I choose not to, though, if I am wearing a skirt that is just below the knee as opposed to longer, since I am not quick with the standing up.