The Roseanne star was walking in Golden Gate Park on Tuesday (11Oct16) when she slipped and injured her left leg.

She shared a snap of her badly bruised and swollen knee, which was broken in three places, on Twitter on Wednesday (12Oct16) and revealed she would be sidelined for weeks.

"Fell broke kneecap!" she captioned the shot.

The 63-year-old later revealed she is set to undergo surgery on Monday (17Oct16), and added, "i will be in bed on crutches for three months! OMG (oh my God)."

She also expressed her gratitude to the medical team which came to her rescue: "i really want to thank the very kind & wonderful #SFParamedics who had to cart my fat a** out of Golden Gate Park over 2 (sic) hospital yesterday!"

The star was in the city visiting her son.