After he was on the negative end of a hit from behind by a member of the Tampa Bay Lightning during the 2016 Eastern Conference Final he felt pain in his neck.
"I had issues turning my neck. I couldn't look right or left," he said.
Letang was able to turn his neck the following day and the issue wasn't bad enough at that time to force him out of the lineup. Not only did Letang finish the playoffs by playing in every game, he would score the eventual Stanley Cup-clinching goal in Game 6 at San Jose.
During the offseason Letang had a chance to rest the injury and let it heal. He underwent various treatments and the issue appeared to have subsided.
But the pain would soon return once Letang began engaging in physical play during the following year's training camp.
"When I showed up to camp last year, it started bothering me when I was getting hit again," he said. "We went over a bunch of stuff (I had to do) to get better. Every month I was trying to get better."
Letang visited several different doctors, looking for a solution to the problem. But as the season dragged on, things weren't getting better. In fact, it was getting worse because the accumulative effect of the hits he sustained throughout the year.