The injury comes as Hargitay was already recovering from several injuries to her legs -- including her other ankle -- which she was being treated for back in May.
The actress shared a photo of herself leaving the hospital on May 19, and wrote, "#ThatFeelingWhen, you go to the doctor, get an MRI and find out that you have a broken knee, a hairline fracture in your ankle, and a torn ligament. It’s always a good idea to go to the doctor. Immediately."
Hargitay added, "Great news is I don’t need surgery... thanks for all the love folks! Just so you know this did Not happen at work!"
It's been a busy year for the actress, whose character recently reunited with her longtime partner, Elliot Stabler (Christopher Meloni), both on SVU and their latest spin-off, Law & Order: Organized Crime. Check out the video below to hear more.