Fibrocystic changes at the anterosuperior femoral neck are highly prevalent in FAI and may have a causal relationship with the condition.
The high prevalence of juxta-articular fibrocystic changes at the anterosuperior femoral neck and their spatial relation to the impingement site suggest an association and possible causal relationship between these alterations and FAI.
Leunig et al. (Fri,) studied this question.