acetabular fossa acetabular fossa the acetabular fossa is a fossa located at the centre of the acetabulum. it is occupied by the ligament of head of femur. acetabular fossalateral view of the right hip bonedetailsidentifierslatinfossa acetabulita98a02.5.01.004ta21310fma17269anatomical terms of bone in contrast to the thick and smooth surrounding lunate surface, the pelvis' articulation with the head of the femur, the acetabular fossa is rough and thin, often transparent, and continuous with the acetabular notch below. additional images hip joint. lateral view. fat in acetabular fossa.