The Cowboys signed Romo to a 6-year extension worth $108 million, with 55 million guaranteed and $25 million in bonuses, thus securing him for the rest of his career and relieving the pressure from the salary cap, which was reported to have less than $25,000 space before the deal was struck. In the middle of April 2013, he underwent back surgery to remove a cyst. Although it was characterized as a minor procedure by the team, he would end up missing all of the mini-camp and organized team activities.  Romo opened the season with a win over the New York Giants, passing for 263 yards and two touchdowns. He briefly left the game with a rib injury, but returned after halftime and finished the game. After Week 7, his 100th career start, Romo had thrown for 27,485 yards, the most by a quarterback in his first 100 starts since 1960.  In Week 16, against the Washington Redskins, with the Cowboys trailing in the fourth quarter and needing to win to keep its playoff hopes alive, he led the team to a touchdown drive with 1:08 remaining in a 24-23 victory, with what was later diagnosed as a season-ending herniated disk injury. Head coach Jason Garrett would later say: "He might have had his finest hour ... We talk about mental toughness, being your best, regardless of circumstances. Somehow, some way, he helped us win that ballgame."  Romo underwent back surgery on December 27, 2013, and was placed on the Cowboys' injured reserve list. Garrett announced that Kyle Orton as the starting quarterback for the Week 17 game against the Philadelphia Eagles, which the team lost 24-22, to miss the playoffs for a fourth straight year.

Answer this question "How successful was the rest of that season?" by extracting the answer from the text above.
miss the playoffs for a fourth straight year.