Holly Holm has gone from on top of the world to an uncertain future

As if losing her second straight fight wasn't enough, Holly Holm has suffered another setback in her quest to return to the top.

Holm, who earned the belt in the UFC women's bantamweight division with a knockout against Ronda Rousey last year, has undergone surgery to repair a broken thumb.

Holm's left thumb was shattered during a loss to Valentia Shevchenko last month. Larry Fresques, who is Holm's manager, told ESPN the fighter had eight pins inserted into her hand earlier this week. It's uncertain when she'll be ready to fight again.

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"We'd still like to fight by the end of the year," Fresques said. "As far as an opponent, we'll have to see who comes up. Whoever she fights, Holly needs to take care of business."

Holm lost her title belt earlier this year in a fight against Miesha Tate. Fans have been clamoring for a rematch against Rousey, but we'll have to wait and see if it happens after Holm's recent setbacks.