Hi @paulp2 and welcome to Connect.
You will see that I moved your post to an ongoing discussion talking about slipping rib syndrome and how to deal with it. I did this so you could connect with members like @stacey01 and @marye2
Successful management of iliocostal impingement syndrome: A case series: https://journals.sagepub.com/doi/full/10.1177/0309364615605394
"How is rib-tip syndrome treated? If the condition persists or causes severe pain, surgery may be recommended. The procedure, known as costal cartilage excision, has been shown in clinical studies to be an effective treatment for slipping rib syndrome."

It sounds very painful, what are you doing to help with pain management?