What can they do at spinal screenings?

Check for curves: I believe you are referring to screening for scoliosis, or curves in the spines. This has not been clearly shown to be beneficial to screen for. However, if you notice a curve or have unexplained back pain, you should get it checked out. For a complete list of preventive recommendations by age/gender and risk factors (if you have an ipad/ipod/ipad see the prevention checklist 2013 app.