Olympic shot put champion Valerie Adams has checked herself into hospital again, although this time it's for a relatively minor procedure.

Adams had a bit of maintenance done on her right knee and will need 8-12 weeks of rehab.

Adams has endured a torrid return from shoulder and elbow surgery last year, pulling out of this month's World Championships due to poor form.

The 30-year-old, who has won the world title four times, lost for the first time in 56 meetings over five years as she returned from injury this season.

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Earlier this month she said her recovery from right elbow surgery, particularly, was taking longer than expected, adding "no-one said it would be easy but I ... will continue to fight and work towards defending my title in Rio 2016."