Table 1.

Study Characteristics

Study	Study Design	Study Size	Study Population	Age (range, mean SD)	FAI Type	Method of Diagnosis	Study definition of FAI
Siebenrock 2011 [12]	Case Control	75	37 Elite Male Basketball players and 38 non-athletic controls	Age 9–25 years (mean 17.6)	cam-type deformity	MRI	Alpha angle of >55° from the 9 o’clock (posterior) to the 3 o’clock positions
Philippon, 2013 [14]	Cohort	88	61 amateur male ice hockey player and 27 skiers	Age 10–18 years (mean 14.5 hockey players) (mean 15.2 skiers)	cam-type deformity	MRI	Alpha angle of >55°
Agricola, 2014 [15]	Cohort with 2 year follow up	63	63 Elite Male soccer players	Age 12–19 years (mean 14.4)	cam-type deformity	X-ray	Alpha angle >60