I'm from Iowa and first joint replacement on left knee. I'm having severe knee spasms that last 10 seconds or so and this happens quite often when laying down. It's in the knee and feels like it's contracting and shakes like crazy and painful. The dr changed pain meds to oxycodone. This helps if i take 2 before bed mostly but still happens maybe depending on my activity that day. It sets me back because the knee is very sore and stiff. I had meniscus surgery twice before and had twitching a few weeks after in the same area afterwards the last time. But that was like a short twitching with no pain. Now it's a very painful violent shaking and twice a kicking reflex. Only relief is sitting up and waiting for meds to catch up or taking another and waiting for that to kick in. Anyone know what's going on? thanks