Bethanie Mattek-Sands says she dislocated her kneecap and ruptured a tendon in her shocking Wimbledon fall.
The American will head to New York on Sunday and undergo surgery on the right knee that buckled during her second-round singles match against Sorana Cirstea.
Mattek-Sands has been undergoing scans and receiving treatment at the Parkside Hospital in Wimbledon.
The 32-year-old doubles specialist has avoided watching replays of her fall and is facing up to a long period of rehabilitation before returning to the game.
She said: "I'm going to be heading to New York City tomorrow to see some more doctors to see what's really going on with my knee.
"I dislocated my patella out on the court, that's what the pain was coming from, and I ruptured my patellar tendon and I'm going to be needing surgery."
Through tears, she added: "So I'll be out for a while."
The harrowing incident occurred on Court 17 on Thursday.
Mattek-Sands was attacking the net and looking to play a volley when she fell over and immediately felt intense pain.
She was taken from the court on a stretcher and rushed to hospital by ambulance.
She spoke in a Facebook Live video on Saturday lunchtime, saying: "It's obviously been kind of an emotional and painful rollercoaster, the last couple of days.
"I know you've seen the video of the replay and I, for obvious reasons, have not looked at it. I hate watching sports injuries, let alone myself.
"But I was in the middle of my match and playing that last point I was coming to the net, and all I remember is hearing this pop in my leg. Everything was slow after that, it was just this loud pop."