I was struggling to walk with arthritis in my knee. Used a support and a stick. I would cry with the pain. Being a carer to my husband i was getting really worried. A friend suggested the arc. She fiund it so good. Within half hour my pain went. I felt a bit fatiqued phoned arc..they are so helpful to answer your quieries. Phone or email. I use it daily since oct..no meds no stick no support. My knee feels almost normal. I walk to the village. I even put my delivery of logs away. Another thing that worried me..my husband and 2 sons are using theirs and also my friends. I find its amazing. It suttely helps with everything..i wouldnt be without it. I am a reiki master but needed help with my knee.