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At the lower part of the acetabulum is the acetabular notch, which is continuous with a circular depression, the acetabular fossa, at the bottom of the cavity of the acetabulum. The rest of the acetabulum is formed by a curved, crescent-moon shaped surface, the lunate surface, where the joint is made with the head of the femur.
The acetabular notch is a deep [citation needed] notch in the inferior portion of the rim of the acetabulum. [1]: 1354 It is bridged by the transverse acetabular ligament, converting it into a foramen (through which nerves and vessels (including the acetabular notch of obturator artery [1]: 1250 ) pass into the hip joint cavity).
The acetabular labrum (glenoidal labrum of the hip joint or cotyloid ligament in older texts) is a fibrocartilaginous ring [1] [2] [3] which surrounds the circumference of the acetabulum of the hip, deepening the acetabulum. The labrum is attached onto the bony rim and transverse acetabular ligament. It is triangular in cross-section (with the ...
A teardrop-shaped lower portion gives origin to the iliofemoral ligament of the hip joint and borders the rim of the acetabulum. [ 1 ] Anteromedially and inferiorly to the AIIS is the iliopsoas groove , the passage for the iliopsoas muscle as it passes down to the lesser trochanter of the femur .
The orientation and position of the acetabulum is one of the main morphological traits that caused dinosaurs to walk in an upright posture with their legs directly underneath their bodies. [10] The prepubic process is a bony extension of the pubis that extends forward from the hip socket and toward the front of the animal. This adaptation is ...
In radiography the presence of a "crossover sign" is produced when the posterior wall of the acetabulum crosses the anterior wall before reaching the acetabular roof. It is a sign of acetabular retroversion and it has been linked with overcoverage and pincer impingement. Nevertheless, this sign has been described in 6% of the normal population.
Acetabular depth ratio Deepness of acetabulum. The width is measured between the inferior margin of the teardrop and the lateral rim of the acetabulum. [11] The depth is measured perpendicularly from the midpoint of the width line. [11] >250 Less indicates a dysplastic hip; Center-edge angle of Wiberg The superior-lateral coverage of the ...
When either abnormality is present, it changes the position of the femoral head in the hip socket. The increased stresses that the femur and or acetabulum experience may lead to a fracture of the acetabular rim or a detachment of the overstressed labrum. [4] Women are more susceptible to acetabulum labrum tears due to their pelvic anatomy.