Former World Longtrack and 3 x European Grasstrack champion Romano Hummel has died at the age of 27.
https://www.fim-moto.com/en/news/news-detail/article/fim-family-mourns-the-passing-of-romano-hummel
Obviously it depends on the severity but speaking from experience, I'm in constant pain which limits what activities I can do 4 years after shattering mine.