An Ohio Oil Company (OOC) (defendant) truck got into an accident with W.R. Smith (plaintiff), causing injury to Smith. Smith brought suit against OOC and the OOC employee driving the truck at the time of the accident. At trial, Smith called a doctor who used a plastic human skeleton model to help explain his testimony. Specifically, the doctor showed x-rays of Smith’s injured pelvis and compared the x-rays to the model to show what a normal pelvis should look like. The trial court permitted use of the model over OOC’s objection. The jury found in favor of Smith. OOC appealed.