primarily performing data

An employee works at home part of each work week, primarily performing data entry tasks. One day the employee was carrying a large file folder of forms from his car into his house and was going to his home office to work. However, he stumbled on one of his child’s toys lying on the driveway and fell. He sprained his right hand and was unable to perform any work either at home or the workplace office for seven work days. The employee feels that the incident is work-related, but the employer is not sure. While the employee is injured at home doing work stuff was it the work that caused the injury?