Getzlaf, who is scheduled to represent Team Canada in the Olympics next week, suffered a sprained left ankle during the second period of Anaheim's 4-2 win at the Honda Center. He immediately had X-Rays -- which came back negative -- and will undergo further tests on Tuesday.
"We really haven't got an assessment, other than he sprained his ankle," Anaheim coach Randy Carlyle said. "Right now, he's walking in a boot and he'll walk on crutches and we'll have an MRI done (Tuesday). That will give us a better indication on the severity of the sprain."
"I just talked to him briefly after the second," defenseman Ryan Whitney said. "I saw it happen. I was on the bench and it looked bad. I thought it was his knee, so I guess it's good that it's not that. He seemed a little disappointed obviously, and it hurts us. But guys stepped up in the second half of the game."
Corey Perry had a goal and two assists for the Ducks (28-24-7), who pulled within three points of the No. 8 Nashville Predators in the Western Conference and ended a five-game skid against the Kings. Anaheim has also won its last 10 games on home ice.
"We haven't had success against them like we've wanted to, but it was a great win for us," Perry said.
Oscar Moller and Anze Kopitar scored for the Kings, who hadn't lost since Jan. 11. They now sit in fifth place in the West.
"We're pretty happy with those nine wins in a row, but we're a little disappointed," Los Angeles defenseman Drew Doughty said. "We didn't play very good in the first two periods, but we came to play in the third. We took it to them. We've just got to learn from that."
Moller opened the scoring with a goal that ended a 15-game drought, but Anaheim responded with a power-play goal by Teemu Selanne, who has two goals in four games since returning from a broken jaw.
The Ducks took the lead when Perry beat Davis Drewiske to a loose puck and made a blind pass to Getzlaf in front, where he deposited his 15th goal of the season. Moments after an apparent power-play goal by Perry was waved off and Getzlaf skated to the dressing room, Saku Koivu beat Jonathan Quick (29 saves) at 6:24 of the second to make it 3-1.
Kopitar scored his 27th goal during a power play late in the second period, but Perry immediately replied with his 21st of the season just 24 seconds later. Jonas Hiller made 35 saves for the Ducks.
"I think right now we're just looking at points," Anaheim defenseman Scott Niedermayer said. "Each night, if we can get two points, we're more than happy. We need them right now. It'd be nice to get a little run going right now."
Material from wire services and broadcast media was used in this report.
1 - 0 LAK
1 - 1 Tie
2 - 1 ANA
3 - 1 ANA
3 - 2 ANA
4 - 2 ANA
Delaying Game - Puck over glass
Too many men on the ice