These are the best invention. There is a pad that goes on your surgical site (I have it inside a folded flannel pillowcase). Then there is a small cooler I have 3 frozen 16 ounce water bottles (yes I actually bought 6 water bottles). Then fill with water. It circulates through the pad. So much better than ice packs.
https://www.amazon.com/Ossur-Cold-Ru...TF8&s=hpc&th=1
We use them on: hip, knee, shoulder and back surgeries. It really decreases the need for pain meds.
Iris Lily: I had a knee replacement:cool: