The Boston Celtics lived up to their reputation for deft inside play to give the New York Knicks and rookie Patrick Ewing another taste of defeat last night.

The Celtics outrebounded New York, 57-38, en route to a 113-104 victory as they dealt the Knicks their 11th loss in 14 games. It was the first time in seven games at Madison Square Garden that a New York opponent had scored more than 100 points.

Robert Parish had 27 points and 12 rebounds and his backup, Bill Walton, added 11 rebounds. Kevin McHale had 25 points and Larry Bird 18 points, 10 rebounds and 10 assists.

"The Knicks came out obviously well-prepared," said Boston Coach K.C. Jones. "Fortunately, our big guys came through."

The Knicks, who trailed, 67-64, at the half, came back to tie the game, 76-76, with 6:18 left in the third quarter. Boston then took control with a 12-2 run during which McHale scored seven points.

Said Ewing, who had 18 points and 10 rebounds in his first game after missing two others because of an ankle injury. "They're a very deep talent . . . and they're all very physical."