By the 1951 season, Motley started to feel the physical effects of his hard-hitting, up-the-middle running style. He suffered a knee injury in training camp, and he was getting older; by the time the season was in full swing, he was 31. Motley only ran for 273 yards and one touchdown that year, an uncharacteristically low total. Despite Motley's troubles, the Browns made the championship game again after winning the American Conference with an 11–1 record. Cleveland, however, lost the title game to the Rams, 24–17. Motley had just five carries and 23 yards.