BEREA, Ohio — Joe Thomas felt the tendon detach from his elbow and roll up in his arm, and before the pain registered, the Browns’ seemingly indestructible tackle realized everything had changed.

His day was over. His season done. His career in doubt.

Cleveland’s iron man was finally flattened.

Thomas suffered a torn left triceps during Sunday’s loss to Tennessee and will miss the remainder of his 11th NFL season, a devastating blow to the perennial Pro Bowler and winless Browns.

The 32-year-old Thomas missed a snap since turning pro in 2007. He will undergo surgery Tuesday.