The Illinois Workers Compensation Act determined that the value of a work related elbow injury is based on a percentage of loss use of the arm. The Act states that a loss use of an entire arm is worth 253 weeks. When a worker injures his elbow, those cases are determined based on a percentage of loss use of that arm. When the percentage of disability for an arm is determined due to the nature and extent of the injury suffered by the injured worker, that number is multiplied by the permanent partial disability rate to determine the value of the claim.