Edward Kennett is still on track to ride in the world under-21 championship despite suffering a hair-line crack just below his left knee-cap.
The teenage Eastbourne star was hurt when he crashed while riding for Rye House in a Premier League match at Reading on Monday night.
Kennett was coming out of the second turn when his foot-rest caught in the fence, hurling him over the handlebars and on to the track.
He said: "I'm feeling a bit down. I don't know how long it will be before I can ride again. At the moment I don't know anything. I've got to go back to hospital next week when I hope I will be told something."
Kennett, however, is hoping to be back in action before the world final at Kumla in Sweden on September 13, for which he qualified as first reserve from the semi-final in Slovenia.
His other target is the Conference League Riders' Championship which takes place at Rye House on August 30, two days after his 17th birthday.
The injury is the first setback for the talented Kennett, whose meteoric rise has taken him from reserve to No. 1 in Rye House's Premier League team in his first season in full-time speedway.
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