@pat9892 I had arthoplasty on my right thumb in 2012, and 2013. Yes, same thumb 3 times!
First time he did the process, and packed the space with cadaver tendon. That tendon material slid into the palm of my hand. Second surgery, he removed about half of that tendon material. Again, it slid into my hand.

Third try, doctor took my own tendon. That was the trick! However, that was a long process. No more pain, that’s the point.