Örebro took the lead after 23 minutes, as a result of Wilma Öhman's awkward, but ultimately successful, shot from the right.
It was then in the 65th minute that Anam Imo injured himself.
She started limping after taking down a deep lead ball in the penalty area.
- I do not know much more than that she did badly in connection with the deep lead run.
What I understand is about the foot, says Piteå's coach Stellan Carlsson.
The second goal of the match came in extra time when Piteå's Ellen Löfqvist steered the ball into her own goal.
The win means that Örebro climbs to a sixth place in a limping table.
ARCHIVE: Rosengård barely won against the last - still undefeated (May 14)
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Olivia Schough during a Damallsvensk match in April.
Photo: Bildbyrån