Pal G P
Department of Anatomy, Government Medical College, Gujarat State, India.
J Anat. 1989 Feb;162:9-17.
An attempt has been made to find the route and relative magnitude of weight passing through different components of the sacrum. In 44 adult male dry sacra, the combined surface area of the body and the two facets was compared with the combined surface area of the two auricular surfaces. It was found that the forces acting on the body and articular facets, at the upper end of the sacrum, are ultimately transmitted through the two auricular surfaces with an appreciable part of the load passing directly from the transverse process of the fifth lumbar vertebra to the ala of the sacrum through the lumbosacral ligament. The direction of the trabecular bone indicates the route of load transmission in the sacrum. From the various parts of the sacrum (body, facets, alae and laminae) distinct sets of trabeculae extend towards the auricular surface. Observations on the sacra with the anomalous articular processes provided strong evidence for the role of the neural arch elements in the load transmission. In specimens where the articular facet was absent on one or both sides, there was always an accessory facet on the ala of the sacrum so that the load was transmitted to this facet from the transverse process of the fifth lumbar vertebra.
已尝试探寻重量通过骶骨不同组成部分的路径及相对大小。在44块成年男性干燥骶骨中，将椎体和两个关节面的总面积与两个耳状面的总面积进行了比较。结果发现，作用于骶骨上端椎体和关节面的力最终通过两个耳状面传递，相当一部分载荷直接从第五腰椎横突经腰骶韧带传递至骶骨翼。骨小梁的方向表明了骶骨内载荷传递的路径。从骶骨的各个部分（椎体、关节面、骶骨翼和椎板）有不同组的骨小梁向耳状面延伸。对关节突异常的骶骨的观察为神经弓结构在载荷传递中的作用提供了有力证据。在一侧或两侧无关节面的标本中，骶骨翼上总有一个副关节面，以便载荷从第五腰椎横突传递至该关节面。
