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Friday, August 22, 2014
Updated: August 23, 4:17 AM ET
Garrett Richards has knee surgery news services

OAKLAND, Calif. -- Los Angeles Angels pitcher Garrett Richards underwent surgery Friday to repair the torn patellar tendon in his left knee.

Richards tweeted a picture of himself in a hospital bed before the surgery, then used social media to announce the procedure was finished.

I'm out. Surgery went great! Thank you everyone for your support and positive vibes. I will get through this.

- Garrett Richards (@GRICHARDS26) August 23, 2014

The ace right-hander took to Twitter earlier in the day, too.

I was expecting to be wearing a different uniform today but I make this look good! #imgoingin #igot5onit

- Garrett Richards (@GRICHARDS26) August 22, 2014

Richards was 13-4 with a 2.61 ERA this year before getting hurt Wednesday while covering first base during the Angels' 8-3 win over the Boston Red Sox. He is on crutches and might rejoin the club next week in Anaheim.

Angels manager Mike Scioscia said Richards' surgery "went as expected." He added that the timetable for Richards' recovery remains six to nine months.

Information from The Associated Press was used in this report.