Shortly before Christmas in 2009, Laurie Saunders was preparing for a happy day. Her first grandchild would soon be born, and she was loading a stroller into the back of a pickup truck before heading to the baby shower. But while lifting the stroller into the cab, she felt an unusual pain in her shoulder. Assuming it was something minor, she headed to her doctor, where she underwent an MRI.

Shortly afterwards, Laurie received...