Hi I'm a 53yF . A few weeks ago I started experiencing acute knee pain, the best way to describe it is a serring ripping pain in my knee. It feels like a knife is slicing my knee open. The pain is localized to the inner portion of my knee. As quick as it comes it leave. Anything can trigger it from trying to bend my knee to just tapping my foot on something, I do suffer from sciatica pain in my low back