Maria Paseka, a two-time world vault champion and four-time Olympic medalist, said she is out for the rest of the year after December back surgery, according to Russian news agency TASS.
Paseka, 22, earned the lone Russian title at worlds in October, repeating as champion on vault by edging American Jade Carey by .084. She handed Simone Biles her only defeat in a 2015 Worlds final, also on vault.
Paseka also took vault silver and bronze medals at the last two Olympics, as well as helping Russia to team silvers in London and Rio.
As Paseka is sidelined, Russia’s two other recent headliners are on the comeback trail.
Viktoria Komova, the all-around silver medalist at the 2011 Worlds and 2012 Olympics who missed Rio due to a back injury, competed in December for the first time since 2015.
Aliya Mustafina, a seven-time Olympic medalist with two uneven bars golds, is expected to return to competition this spring from June childbirth.
The world championships are in Doha in October.
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