Double Women’s World Cup winner and current leader of the inaugural FIM Women’s Motocross World Championship, Yamaha Van Beer’s Katherine Prumm, will miss this weekend’s Grand Prix of Germany at Teutschenthal after breaking her left collarbone while training in Belgium on Tuesday. The 20 year old suffered a relatively slow speed tumble on her YZ250F but the impact was enough to force a complicated fracture to the collarbone and the New Zealander underwent surgery immediately to have a plate inserted and fragments of bone cleaned from the break.