The 22-year-old landed wrong during a jump, but was able to complete the program and grabbed his shoulder as the pair left the ice.
There were a little too many misses for the siblings from Gothenburg and it affected the overall picture.
They scored the least of all 42.55.
Italian Sara Conti and Niccolo Macii won on 70.45 points.
Then it was double German, Annika Hocke and Robert Kunkel (67.08 points) ahead of Alisa Efimova and Ruben Blommaert (62.77).
Since only 13 pairs are participating, the Swedes can continue to compete tomorrow when the free program is decided.