Jim Braxton Injury

[JoeZagorski]

Hey Guys,
What type of injury did Jim Braxton have at the beginning of the 1973 season? Was it a knee injury? Was it his groin? His ankle? Separated shoulder? I appreciate all of your responses. Thanks!
Sincerely,
Joe Zagorski

[Jay Z]

Per newspaper reports from 9/7/1973, it was a "back ailment."