BACKGROUND Vitamin D is made in the skin on exposure to solar radiation, and it is necessary to optimal skeletal health. Subjects who use a tanning bed that emits ultraviolet B radiation (290-315 nm) are likely to have higher 25-hydroxyvitamin D [25(OH)D] concentrations than do subjects who do not regularly use a tanning bed. OBJECTIVE The first objective of this study was to ascertain whethe...

Orthopaedic rehabilitation of osteoporosis by muscle vibration exercise is investigated theoretically using Wolff's theory of strain-induced bone 'remodelling'. The remodelling equation for finite amplitude vibration to be transmitted to the bone via muscle corresponds to a slowly time-varying non-linear dynamic system. This slowly time-varying system is governed by a Riccatti equation with rap...

Additive manufacturing, in particular powder bed-based fabrication processes hold promise to revolutionize biomedical engineering for the ability provide customized, functional implants, example as bone replacement materials. However, providing particles that unify material requirements biodegradable and bioactive biomaterials process enable successful bed fusion remains an unmet challenge. Her...

Introduction: In general, exposed bone wounds are covered with flaps. If the wound is small, skin grafting perifascial areolar tissue can be performed for resurfacing; however, it not suitable large bone-exposed exceeding 5 cm in length.Methods: Six patients underwent at our medical center between 2014 and 2020. all cases, a local flap donor site could found around wound, vessel to anastomose f...

This article describes a technique for preparing the bed for autologous bone grafting in nonunion surgery. The procedure is divided into 2 steps. First, both ends of the fracture fragments are chipped into small pieces using an osteotome and hammer without peeling off the periosteum, creating pathways into the bone marrow. Second, cancellous bone harvested from the iliac crest is grafted into t...

Relative abundances of skeletal elements at Plio-Pleistocene archaeological sites have long been interpreted to represent selective transport of portions of large prey. Models from optimal foraging theory suggest that the degree of carcass transport selectivity reflects transport constraints, particularly transport distance. A quantitative analysis of skeletal element abundances in five bone as...

Whole body bone scan with Technetium-99m MDP (methylene diphosphate) can detect bony lesions due to altered osteoblastic activity.Non-physiologic or increased radiotracer uptake in the bony structures of patients with a history of malignant diseases is usually interpreted as being suspicious of bone metastasis. It is extremely important to properly distinguish false positive sites of Tc-99m MDP...

OBJECT Anemia and leukopenia caused by copper deficiency are well-documented consequences of long-term total parenteral nutrition. We measured the serum copper levels of bed-ridden patients receiving enteral feeding, and evaluated optical and ultrastructural features of bone marrow before and after copper supplementation. PATIENTS AND METHODS Serum samples were obtained from 15 bed-ridden eld...

Bone loss is a well-documented change during and after long-duration spaceflight. Many types of countermeasures to bone loss have been proposed, including vitamin K supplementation. The objective of this series of studies was to measure change in vitamin K status in response to microgravity under a variety of spaceflight and spaceflight analog (model) conditions, including long-duration spacefl...