There is nothing inherent to prior back surgery that would limit your ability to have certain cosmetic procedures on your abdomen. Cavitation as I understand it uses radiofrequency energy to kill fat cells. Regardless of the risk of that specific therapy, I would question the decision to go forth with it. Such procedures do not have a lot of evidence, can have significant pain and downtime and provide a limited result. If you are interested in non-invasive fat reduction, you might try CoolSculpting instead. The technology is now widely available and is far less painful and easier to recover from than RF modalities. The presence of back screws would have no bearing on your ability to have CoolSculpting.Best,Dr. Pyle