What's That Thing You Get If You Do, Or, If You Don't?

Karen can barely walk without her walker. When she tries, she often falls, including the time during the winter when she tore her rotator cuff and did some other damage to her shoulder. The rotator cuff tear will not heal without surgery, but if she has surgery, she will not be able to use her walker for at least three months. Which means she will almost certainly fall, and probably damager her shoulder. Probably requiring surgery...