Even though Johnson suffered three hobbling injuries last year, he still managed to gain 931 yards.

Since 2001, Johnson has suffered a series of minor right brain strokes.

Early in the 2008-09 season, Johnson suffered a shoulder injury and missed 41 games after needing surgery.

Johnson suffered severe injuries including a broken neck and back.

Johnson suffered from kidney problems and related illnesses for the last year of his life, eventually using a wheelchair.

Johnson never fully recovered from his injuries and suffered what was described as a stroke in August.

During a game in the 1986-87 season, Johnson suffered a neck injury, which effectively ended his career.

He did not elaborate, but said Johnson was "suffering from amnesia."

On top of that, Johnson suffered from vocal nodules and had to go through speech therapy.

Johnson started the 1989 season strongly but suffered a serious injury when he broke his wrist in a practice session.