Table IV.

Summary of studies investigating femoral head cover using CT techniques.

Study	FHC normal or asymptomatic group (number of hips)	FHC patient group (number of hips)
Topographical methods
Cheng et al 2015 4	70.1%, SD 5.7 (40)	44.7%, SD 10.1 (42)
Dandachli et al 2009 15	71%, SD 4.6 (40)	72%, SD 5.0 (24)*
Dandachli et al 2008 3	73%, 95% CI 71 to 74 (36)	54%, 95% CI 38 to 64 (39)
Klaue et al 1988 6	70% (21)	33% to 55% (25)
Liu et al 2015 12	Not studied	52.6, 2.6 (4)
Other methods
Larson et al 2015 13	40%, 2 (409)	Not studied
Hansen et al 2012 14	58%, 4.8 (18)	50%, 4.4 (16)

^*Patient group retroversion.