THE STRUCTURE OF THE TRABECULAE OF CANCELLOUS BONE .2. LONG BONES AND MASTOID
THE STRUCTURE OF THE TRABECULAE OF CANCELLOUS BONE .2. LONG BONES AND MASTOID
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DOI：
10.1007/bf02554966
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发表时间：
1990-06-01
影响因子：
4.2
通讯作者：
FAVIA, A
中科院分区：
文献类型：
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作者：
LOZUPONE, E;FAVIA, A
检查乳突、股骨上端和胫骨的迹，以确定它们是否包含与跟骨中观察到的模式相似的血管通道。在横切面上对骨小梁进行连续切片。每个切片都在普通光和偏振光下进行显微放射照相。在各个切片的照片上，（1）血管通道的数量，（2）有或没有骨单位的小梁段的厚度，和（3）骨细胞陷窝与过滤表面的最大距离（即，哈氏管壁或小梁表面）。大约80%的血管通道是哈氏管。它们的频率通过小梁厚度的增加而增加，并且在那些厚度大于428 μ m的小梁中达到100%。深层骨细胞与滤过表面的距离在较薄的骨小梁（无骨单位）和较厚的骨小梁（含骨单位）中几乎相同。有证据表明骨单位存在于许多海绵状骨小梁中。骨单位形成与骨小梁厚度严格相关，使得骨细胞距过滤表面的距离不超过临界值230 μ m（在乳突中）。这些发现与跟骨海绵体中的记录一致。由于本研究中所研究的小梁和跟骨的小梁承受不同的机械载荷，可以想象内小梁骨的主要功能是改善深层细胞的代谢，而不是小梁的机械阻力。另一方面，大多数骨单位是次级的情况表明它们参与骨组织的更新。
The traceculae of the mastoid, the upper end of the femur, and the tibia were examined to ascertain whether they contain vascular channels according to a pattern similar to that observed in the calcaneus. The trabeculae were serially sectioned in transverse planes. Each section was microradiographed and photographed under ordinary and polarized light. On the photos of the individual sections (1) the number of the vascular channels, (2) the thickness of the trabecular segments with or without osteons, and (3) the maximum distance of the osteocytic lacunae from filtering surfaces (i.e., harversian canal walls or trabecular surfaces), were evaluated. About 80% of the vascular channels are harversian. Their frequency increases through the increase of the trabecular thickness and reaches 100% in those thicker than 428 .mu.m. The distance of the deep-seated osteocytes from filtering surfaces appears almost the same in the thinner trabeculae, devoid of osteons, and in the thicker ones, containing osteons. Evidence is provided that osteons are present in numerous spongy trabeculae. Osteon formation is strictly related to the trabecular thickness so that the distance of the osteocytes from filtering surfaces does not exceed the critical value of 230 .mu.m (in the mastoid). These findings are in agreement with those recorded in the calcaneus spongiosa. As the trabeculae studied in this research and those of the calcaneous are submitted to different mechanical loads, the main function of the endotrabecular osteons is conceivably to improve the deepseated cells metabolism rather than the mechanical resistance of the trabeculae. On the other hand, the circumstance that most of the osteons are secondary indicates that they participate to the renewal of bone tissue.