Reinhart suffered a serious injury midway through the 1983–84 season. Skating behind his net during a game against the Winnipeg Jets, his skate caught a rut and he twisted his back as he fell. He had to be carried off the ice on a stretcher, and was initially diagnosed with back spasms. He was later diagnosed as having suffered a herniated disc. He missed 51 games as a result of the injury, but scored a goal and an assist on his return, a 4–1 victory over the Hartford Whalers. Despite missing the majority of the season, Reinhart was the Flames' offensive leader in the 1984 playoffs, leading the team and finishing first amongst all players who did not reach the finals with 17 points.