Independence, Ohio ? It’s do or summertime for the Cleveland Cavaliers.

One more loss, and a second straight Eastern Conference title is history.

One more win, and it’s back to Chowderland for Game 7.

After squandering a 14-point lead at Boston in a hail of missed free throws and getting entangled by the Celtics’ spiderweb-like defense in Game 5, LeBron James and his teammates are down 3-2 and facing elimination from the NBA playoffs tonight at Quicken Loans Arena.

They’ll go into Game 6 short-handed.

Guard Daniel Gibson, one of the club’s best perimeter shooters and a star in last year’s postseason, separated his left shoulder going for a loose ball early in the fourth quarter of Game 5 and will need a minimum of one week to recover.

The Cavaliers may be done before he’s well.

“It’s something we didn’t want to happen,” James said following a light workout Thursday. “It’s kind of the tale of our season – a guy goes down in the heat of a playoff series. He’s very key to our team. It’s not good seeing a guy who is that key to your team in a suit.”

Gibson underwent an MRI on his shoulder after the club returned from Boston. He was not available for comment. As a few of his teammates got in some extra work, the second-year guard struggled to slip a T-shirt over his head before sitting on a courtside bench alongside James.

Gibson made two three-pointers and scored 14 points in Cleveland’s victory in Game 4. In last year’s Eastern Conference finals, he scored 31 points – 25 in the second half – as the Cavs put away the Detroit Pistons in Game 6 to advance to their first finals.

For them to force a Game 7 in Boston, the Cavaliers may need someone else to come off the bench and come through.

“We’re not looking for a spectacular game from anybody,” said James, who scored 35 points on 12-of-25 shooting in Game 5. “We just want to continue to do what we’ve been doing in the two wins we’ve had at home – guys stepped up. We’re not looking for a guy to go out and score 30 points or anything like that.”