I have no idea how much nickel my implant has. I need to ask so I can have peace of mind about that. Today is a bad day. My night was more painful than normal and so is today. I went shopping, but only made it to Walmart. Sam's will have to wait until this weekend. It has been raining for 4 days, so that might have something to do with my discomfort, added to the last weekend walking in the mountains. I was so up about my walking the weekend Monday and Tuesday, then My Brat rebelled starting yesterday. Maybe I will wait to try riding my outside bike a week or so. My Brat needs some TLC right now to get her back to where she was before the trip. So, for all those coming up behind me, it's perfectly normal to have set backs with new and/or extra activities. Our knees have gone through their individual hell and have a whole lot of healing to do which will take a year or more. Please don't get discouraged. It's so easy to do, and I'm one of the worst for doing just that!