Histological slides.

<p>(a) Normal acetabular labrum (Masson’s trichrome stained). (b) Example of a type 1 labral tear associated with cartilage detachment from the acetabular bone (Masson’s trichrome stained). (c) Example of a type 1 labral tear associated with acetabular bone cyst formation (hematoxylin and eosin stained). (d) Example of a type 2 labral tear (hematoxylin and eosin stained). (e) Example of a type 3 labral tear (hematoxylin and eosin stained). Black triangle: acetabular labrum; empty triangle: capsule; black star: acetabular cartilage; white star: acetabular bone; black arrow: chondrolabral junction; striped arrow: acetabular bone cyst; empty arrows: cleavage planes in the labral substance.