Woffinden suffered a shattered collarbone after a heavy crash during the heats at the Millennium Stadium in Cardiff.
The British speedway champion, 22, was set to qualify for the semi-finals after impressing in the heats but - during the 14th run - flew into the back of Nicki Pedersen after a risky move from Woffinden's Wolverhampton team-mate Freddie Lindgren.
“I'm hoping to go private on Monday to have an operation to get the bone put back in place, and I'll do everything I can go make the next Grand Prix at Gorzow in a fortnight," Woffinden said.
“Even though I crashed, it wasn't a disastrous GP as I still got seven points. I'm trying to think positive – I'm still second place in the standings.”
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- Nicki Pedersen