"It's like the inside of my ankle is collapsed," Johnson said, "so a lot of my power and my push-off that I normally have isn't there."
Johnson said a stress fracture was forming from the tightrope surgery he had to repair a lingering high ankle sprain a couple of weeks before the start of the season. He felt he was making progress physically, but the leg was rolled up on a few times in the ensuing weeks, setting him back.
The surgery is a repair of the deltoid ligament, Johnson said, damaged from "all of the high ankle sprains and damage I had done to my ankle." He expects a recovery period of four to five months.
Johnson, 30, has already missed three games this season to injury, and he was sidelined for four games in 2019.