Eckstein F, Löhe F, Müller-Gerbl M, Steinlechner M, Putz R
Department of Anatomy, Ludwig-Maximilians-Universität München, Germany.
J Bone Joint Surg Br. 1994 Jul;76(4):647-53.
In 16 cadaver humeroulnar joints, the distribution of subchondral mineralisation was assessed by CT osteoabsorptiometry and the position and size of the contact areas by polyether casting under loads of 10 N to 1280 N. Ulnas with separate olecranon and coronoid cartilaginous surfaces showed matching bicentric patterns of mineralisation. Under small loads there were separate contact areas on the olecranon and coronoid surfaces; these areas merged centrally as the load increased. They occupied as little as 9% of the total articular surface at 10 N and up to 73% at 1280 N. Ulnas with continuous cartilaginous surfaces also had density patterns with two maxima but those were less prominent, and in these specimens the separate contact areas merged at lower loads. The findings indicate a physiological incongruity of the articular surfaces which may serve to optimise the distribution of stress.
在16个尸体肱尺关节中，通过CT骨吸收测定法评估软骨下矿化的分布，并通过聚醚铸型在10 N至1280 N的载荷下评估接触区域的位置和大小。具有单独鹰嘴和冠状软骨表面的尺骨显示出匹配的双中心矿化模式。在小载荷下，鹰嘴和冠状表面有单独的接触区域；随着载荷增加，这些区域在中心合并。它们在10 N时仅占关节总表面积的9%，在1280 N时高达73%。具有连续软骨表面的尺骨也有两个密度最大值的模式，但不太明显，在这些标本中，单独的接触区域在较低载荷下合并。这些发现表明关节表面存在生理上的不协调，这可能有助于优化应力分布。
