A collision with a semi-trailer truck seven years ago left 52-year-old Deborah Shank permanently brain-damaged and in a wheelchair. Her husband, Jim, and three sons found a small source of solace: a $700,000 accident settlement from the trucking company involved. After legal fees and other expenses, the remaining $417,000 was put in a special trust. It was to be used for Mrs. Shank's care. Instead, all of it is now slated to go to Mrs. Shank's former employer, Wal-Mart Stores Inc. Two years ago, the retail giant's health plan sued the Shanks for the $470,000 it had spent on her medical care. A federal judge ruled last year in Wal-Mart's favor, backed by an appeals-court decision in August. Now, her family has to rely on Medicaid and Mrs. Shank's social-security payments to keep up her round-the-clock care.