2173
In July 2001 he broke his arm in a " freak " training ground incident , this came after recently recovering from a potentially career threatening knee injury .
 broke
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 broke