Table 2.

Criteria used to define injury and overuse injuries in nine studies on overuse injuries of the extremities in children and adolescents

Sports	Authors year	Criteria for injury				Criteria for classified injury as overuse
		Sport-related	Complaint	Time-loss	Medical attention	Repeated microtrauma	No single, identifiable cause	Activity exceeds tissus tolerance	Gradual onset	Other
Soccer	Soderman 2001 [12]	X		X			X		X
	Soligard 2008 [13]	X		X			X		X
	Le Gall 2008 [14]	X	X	X		X
Handball	Wedderkopp 1999 [17]	X		X						Classified traumatic or and overuse injury from the diagnosis: for example tendinitis being overuse injury and a sprain being an acute traumatic injury.
Orienteering	Johansson 1986 [18]	X		X					X
Running	Tenforde 2011 [19]									No definition at all but they called their injury “overuse injuries”
Dance	Leanderson 2011 [20]				X					“Traumatic injuries in case the pain result of a defined trauma. All other injuries were deemed to be caused by overuse.
Gymnastics	Caine 2003 [15]	X		X					X
	Lindner 1990 [16]	X	X	X					X