An implant from hydroxyapatite and polyethylene (HA+PE) composite was investigated for the usability in large bone defects. With this aim, the implants were manufactured in blocks by hot compacting the mixture of 80% HA and 20% PE weight ratio. Powders were machined in a lathe in the dimensions of diaphysis of the radius of the mongrel dogs. Then a defect, 1.5 cm in length, was made in the diap...

Since Ewing’s first report of a previously unrecognized tumor of bone derived from endothelial elements (1)’ there have been numerous reports of tumors which have conformed with his endothelial myeloma, and others which have sought to deny the existence of such a tumor. Among these was an article by the present writer (2) agreeing almost entirely with Ewing’s conclusions. Kolodny (3) believed t...

BACKGROUND Chronic kidney disease (CKD) is common in companion animals. Secondary hyperparathyroidism is an inevitable consequence of the disease and may have deleterious effect on the bone; however, the information regarding CKD-associated bone abnormalities in companion animals is scarce. HYPOTHESIS/OBJECTIVES Dogs with CKD have decreased bone quality compared to dogs without CKD. ANIMALS...

Introduction: Bone, as a hard biological tissue, consists of cells resided in the bone matrix, which is made by an organic (primarily collagen (90%) and 10% amorphous ground substance) and a mineral phase. The main constituents of bone mineral are calcium phosphate and calcium carbonate. The mineral components consist mainly of hydroxyapatite crystals and amorphous calcium phosphate. Bone acts ...

Palaeoradiology is increasingly being used in archaeological and forensic sciences as a minimally invasive alternative to traditional histological methods for investigating bone microanatomy its destruction by diagenetic processes. To better understand ancient mortuary practices, taphonomic studies using microCT scanning are gaining an ever more important role. Recently it was demonstrated that...

Supraspinous ossified rods have been reported in the sacra of some derived sauropod dinosaurs. Although different hypotheses have been proposed to explain the origin of this structure, histological evidence has never been provided to support or reject any of them. In order to establish its origin, we analyse and characterize the microstructure of the supraspinous rod of two sauropod dinosaurs f...

BACKGROUND The role of selenium (Se) on bone microarchitecture is still poorly understood. The present study aims to investigate the macroscopic and microscopic structures of femoral bone tissue in adult male rats after subchronic peroral administration of Se. METHODS Twenty one-month-old male Wistar rats were randomly divided into two experimental groups. In the first group (Se group) young ...

The ankylosaurs are one of the major dinosaur groups and are characterized by unique body armor. Previous studies on other dinosaur taxa have revealed growth patterns, life history and evolutionary mechanisms based on their long bone histology. However, to date nothing is known about long bone histology in the Ankylosauria. This study is the first description of ankylosaurian long bone histolog...

Bone as structure and mineral reserve 405 ties of the bones become the site of haematopoietic tissue, and in the higher vertebrates bone is known to act as a storehouse of mineral salts. In its finer structure, too, bone shows a progressive evolutionary change, although here the account is far from complete. In the earliest vertebrates the bone is acellular. In the primitive bony fishes the bon...

This article highlights the utility of micro-computed tomography (micro-CT) for characterisingmicroscale bone morphology. For this purpose we tested selected samplesof the human bones (Wormian bone, rib, lumbar vertebra) to reconstruct externaland internal morphological features. Selected bony samples were investigatedusing a micro-CT scanner (Skyscan 1172, N.V., Aartselaar, Belgium). The image...