Has anyone had sudden, sharp knee pain when they stood up? So severe that you couldn’t stay standing? This happened the second time I tried to stand up too. Now the side feels tender when I touch it but I can walk on it again. I’m so confused as I didn’t injure it- just stood up. I did Zumba last Wednesday and it’s Monday now. Surely a knee injury couldn’t take that long to show itself? I’m on my feet most of the day in work tomorrow so I’m hoping its something short lived. Has anyone had similar and what was it?