Lindsey Vonn Posts Disgusting Picture Of Knee During LCL Surgery

Thinking of being a world-class skier??? Lindsey Vonn might have ya reconsidering ... 'cause she just posted a pic of the knee she tore up flyin' down a mountain -- and it's DISGUSTING.

Vonn -- one of the greatest female skiers ever -- ripped up her knee in a crash during training last November ... and shredded her LCL so badly, she required surgery.

Lindsey says she put off the operation until now 'cause she had some obligations to fill ... and it's pretty easy to see why she waited so long to go under the knife.

The pic of the operation is NASTY ... docs cut open the side of her knee, pulled her skin apart and did everything they could to stitch her ligament back together.

Good news for Lindsey? She says despite the gnarly pic -- surgery went well and she's doing just fine.

Better news for Lindsey? The 34-year-old is retired from competitive skiing now ... which means (hopefully) no more nasty injuries!!!