Morphological anatomy and histological assessment of acetabular labrum
ZHONG Ming-jin, QIU Zhi-he，LIANG Da-qiang,LIU Hai-feng,LI Kuo-kuo,OU Yang-kan, ZHU Wei-min,LU Wei,WANG Da-ping
Chinese Journal of Clinical Anatomy ›› 2018, Vol. 36 ›› Issue (5) : 486-491.
Morphological anatomy and histological assessment of acetabular labrum
Objective To study the morphological anatomy and histology of human acetabular labrum, and get better understanding of the acetabular labrum in clinic. Methods 12 Formalin embalmed and 8 fresh-frozen cadaveric hips were dissected. The width and thickness of labrum were measured based on the clock face method while the increased depth, surface area and volume of the acetabular fossa were measured. The labrum was stained by the H-E, toluidine blue and collagen immunohistochemically to study its histological characteristics. Results The acetabular labrum had some cartilage quality. The labrum was widest at the point of 2 clock (7.37±2.72) mm, and got the thickest at 9 clock (6.25±1.60) mm; the labrum increased the depth, surface area and volume of acetabular fossa and the means values were (5.30±0.83) mm, (4.98±0.94) cm2 and (7.69±2.03) ml, respectively. The section of the acetabulum was triangular. The acetabular labrum richly contained fibers, and lots of vascularized connective tissue was on the joint capsule side of the labrum. The transition zone of acetabular labral-chondral complex was between the labrum and hyaline cartilage of acetabulum. Conclusions Acetabular labrum is a fibrous tissue ring that covers on the acetabulum rim with cartilage quality, it can increase the depth of the acetabulum and enhance joint stability. The acetabulum labrum is nourished by the well-vascularized joint capsule. Histologically, the acetabular labrum merges with the articular hyaline cartilage of the joint surface of the acetabulum through a transition zone of acetabular labral-chondral complex, and it may render it more prone to damage, which is the anatomical basis for acetabular labrum injury.
Acetabular labrum; Acetabular labral-chondral complex / Anatomy; Morphological / Histological
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