Hall is on injured reserve. He will miss his 30th consecutive game when the Devils play the Philadelphia Flyers at Prudential Center on Friday (7 p.m. ET; MSG+2, NBCSP, NHL.TV).
"We tried all different kinds of scenarios where surgery was the last option," Hynes said. "We worked with him and the medical staff. We were all in constant communication to have a plan and eventually it came down to a situation where he needed to have the surgery. We felt arthroscopic surgery was best and we look forward to him getting his rehab done and go from there."
Hall was injured during practice Dec. 13 and missed the next two games. He returned Dec. 18 but aggravated the injury against the Columbus Blue Jackets on Dec. 23 and hasn't played since.
Hall has 37 points (11 goals, 26 assists) in 33 games this season. He won the Hart Trophy as the League's most valuable player last season when he had an NHL career-high 93 points (39 goals, 54 assists) in 76 games.
Hynes said Hall will play again this season only if he feels confident enough after being cleared by doctors.
"He's a player and he wants to play, but now there's a process after the surgery," Hynes said. "He has to make sure it's in his best interest to rehab the right way and do the right things and it's in our best interest as an organization to do the same thing. If he's 100 percent ready by the end of the season, and we feel he's ready to play, he'll play. If he's not, then he won't."
Acquired in a trade with the Edmonton Oilers for defenseman Adam Larsson on June 29, 2016, Hall has one season remaining on a seven-year, $42 million contract he signed with Edmonton on Aug. 22, 2012. He can become an unrestricted free agent after the 2019-20 season. He'll be eligible to sign a contract extension July 1.
"I'm really happy for Taylor because he cares a lot and understands what he needs to do to be successful," Hynes said. "There was a time there where it was a little murky as to what was going on and why, so for the player he now knows what it is so we can move forward. For all of us, particularly him, there's closure to what it was and now it's time to move forward."
Hynes also said defenseman Mirco Mueller might be able to play again this season. Mueller was taken off the ice on a stretcher after crashing headfirst into the boards early in the third period of a 2-1 loss to the Calgary Flames at Prudential Center on Wednesday.
"Really good news on Mirco. No head or neck injury at all; no concussion," Hynes said. "He basically has a left shoulder injury right now, so he's under the guidance of our medical staff. For as bad as the hit looked and what we all thought possibly could happen, it was really good news with that. ... As we said, it's basically a shoulder injury so it doesn't appear as though anything is long term with him right now."
