The 25-year-old (pictured right with Karina Bryant) had her left hand heavily strapped for the majority of her fights in the -78kg category at the ExCeL on Thursday and has now diagnosed with a fractured thumb.
“Found out a few hours ago I have broken my thumb so preparing for an operation later this week, still the most amazing week of my life,” she wrote on Twitter.
Gibbons only just recovered from surgery to her in shoulder in time to make the London 2012 squad but is now set for another spell.
The South Londoner won Great Britain’s first judo medal for 12 years when she took silver, missing out on gold after losing her final bout against American Kayla Harrison.
Karina Bryant added a second judo medal for Team GB when she took bronze in the +78kg catergory on Friday.