The acetabular labrum is a ring-fibrocartilage structure attached to
the bony edge of the cotile. The structure and the shape closely resemble the
menisci of the knee, although the labrum has a more stable anchorage and it is
placed outside the articular surfaces. Young-adults practicing contact sports
activities (football, rugby, American football, motocross, martial arts, etc.) or
requiring extensive joint excursions (dance) are the most at risk category.
They are at risk not only for the primitive injuries, such as those that
involve conformed joints but also for those secondary to dysplasia or femoroacetabular
impingement. The high functional stress, in fact, seems to accelerate the
manifestation of secondary labral damage, making them precociously symptomatic.
The labral tears are predominantly
localized in the anterior-upper region, there are two possible explanations; a
traumatic aetiology and a dysmorphic disorder. The traumatic origin consists in
the possibility that this area is subjected to peaks of stress during the
movement; that dysmorphic involves a bone conflict between the femoral neck and
the anterior-superior margin of the acetabulum.