Results of an MRI revealed a grade II sprain.
"Everything went as good as we could ever hope for," Flyers general manager Bob Clarke. "[There was] no other damage anywhere in the knee. It'll be a minimum of three weeks, but we're actually very fortunate it wasn't any worse."
With Jeff Hackett out with vertigo, Esche had made nine straight starts. He is 16-6-5 with two shutouts, a 1.91 goals-against average and a .920 save percentage.
Antero Niittymaki was recalled from Philadelphia of the American Hockey League and will share goaltending chores with Neil Little, a career minor leaguer.
The Flyers play Washington and Atlanta before the All-Star break begins Friday, and Clarke said he has no plans to shop for a goalie.
"We play two games and then we've got the All-Star break, so that'll help. And by that time, Hackett will be ready," Clarke said.
He said Hackett is expected to return next week.
Niittymaki, 23, is a second-year pro out of Finland. In 29 games
with the Philadelphia Phantoms, he is
14-7-5 with a 2.14 goals-against average.
"You have to play hard no matter who's in goal,"
Philadelphia's Jeremy Roenick said. "This is a chance for a young
kid to make a statement. We should appreciate that and give him all
the opportunity we can to let him make a big splash."
Niittymaki has made great strides since last season. He plays
more upright, challenges the shooter and has learned to play the
angles of the smaller rink.
"This is why I came from Finland last year, to play in the
NHL," Niittymaki said Tuesday. "It's my first start, so I'm
Niittymaki will be backed up by Little, his partner with the Phantoms.
"I learned to play the puck a lot, be more aggressive, come out
more and challenge the forwards," Niittymaki said. "I'm not
nervous right now, maybe tomorrow."
Coach Ken Hitchcock said he has faith in Niittymaki.
Information from SportsTicker and The Associated Press was used in this report.