Vaughan made 24 appearances in the league for Sunderland last campaign, with his goal against Newcastle his only one of the season.
David Vaughan: "It (the injury) was an issue all season really, and probably last season a bit as well.
"It's something that I've got to work on and keep paying attention to in the gym. Hopefully though I've turned a corner and it won't be too much of an issue next season.
"I've seen a few different medical people, and the Welsh medical staff have helped me out as well," he said.
"They've given me a programme, as well as the Sunderland staff. So hopefully that will cure the problem.
"I think you reach your best form when you're playing consistently, and that has been something of a struggle for me at times.
"Next season though, fingers crossed, I'll be injury free and be able to make more of a contribution."