@nancyjo1490 I had severe hip osteoarthritis (OA) in my 50's, and the pain actually was felt much more in the side of the hip and in the groin, which is typical. Now I have the pain you describe, but it is caused by spinal issues & nerve impingement, which we are managing conservatively at this point.

Deep buttock pain can have many causes, and arthritis is actually pretty far down the list:
https://www.healthline.com/health/pain-in-buttocks
Have you had imaging and a hands-on physical evaluation by an orthopedist to pinpoint the cause? If so what were the doctor's diagnosis and recommendations?

It is important to know the exact diagnosis before you proceed, because treatments very. Sometimes physical therapy, including instruction for daily at-home exercises and stretching can help, other treatments may include regular icing, anti-inflammatory medications and injections, depending on the cause.