Subjects who agree to participate will be assessed (assessments listed below) after the diagnosis preoperatively and 2 months postoperatively. One half of the group will start the walking program at the 2 months postop visit and be assessed again at the end of the walking program, the other half will be assessed again at 3 months postop and start the walking program at that time and be assessed again at 4 months postop. All subjects will be contacted by phone during their walking program to allow for questions from the subjects and to offer support and encouragement. Subjects will be given instructions and a daily diary to track steps taken each day (appendix A).