The superior acetabular labrum is the thickest and most clinically significant portion of the labrum, covering the superior and posterosuperior acetabular rim where the principal weight-bearing contact occurs.
Provides superior femoral head containment during the stance phase of gait, seals the superior joint for fluid pressurisation, and distributes contact stress across the superior acetabular cartilage during load bearing.
Superior labral tears in developmental dysplasia occur from chronic rim overloading as the dysplastic acetabulum concentrates stress on the superior-anterior rim. Superior labral ossification (labrification) is the end-stage of chronic superior overloading.
Progressive superior labral tearing and ossification in developmental dysplasia from concentrated rim loading, an indication for periacetabular osteotomy to redistribute forces.
Acute superior labral injury from high-impact loading in contact sports, producing lateral hip pain and a positive FADIR test, confirmed by MR arthrography.
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