I believe the poster was referring to the test by Orthopedic Analyses, LLC in Chicago. See https://www.orthopedicanalysis.com/order-testing-panel, specifically test #2. I have had a TKR and a Revision to the tibial component which showed no cement left on the tibial component. The doc literally lifted the prosthetic out of my leg, no chiseling. Now, 3 years later, I've got a loose prosthesis yet again. We've done blood work, a CT and I'm waiting for my Nuclear Bone Scan. If I show up with a "hot" knee again, we really have to determine why my body keeps "eating" the cement. On the revision surgery, they found a fracture in the tibial plateau on the far right side which they "built up" with cement. Now the bone and cement are gone. I have an empty spot right below the tibial plateau. This is all so scary and when I mention the concept of allergies to bone cement components or even metal parts (I know I am allergic to Nickel) I get the typical answer of "that is almost impossible or I've never heard of that being an issue". However, when I read this forum, it becomes clear to me that for some of us it is an issue. But geez, what is one suppose to do?