This paper introduces the development on the research of measuring theory for orthopaedic biomechanics in detail. Then, the measuring method and corresponding measuring device are also mentioned. Advantages, disadvantages and development for the device are also introduced. Finally, the research prospect for it is introduced.
Biomechanical Phenomena ; Bone and Bones ; physiology ; physiopathology ; Physics ; instrumentation ; methods

Platelet-rich plasma (PRP) is a kind of plasma with high concentration of platelet,which includes a lot of growth factors. It was widely used in oral and maxillofacial surgery and orthopedics, for the repairing of bone, cartilage and soft tissues. The growth factors, especially PDGF and TGF-beta, plays an important role in different stages and aspects.
Animals ; Bone Diseases ; therapy ; Bone Regeneration ; Bone and Bones ; abnormalities ; physiopathology ; Humans ; Platelet-Rich Plasma ; chemistry

Osteoarthritis (OA) is the most prevalent of joint diseases,and its pathology is characterized by the degeneration of cartilage, sclerosis of subchondral bone, and osteophyte formation. Localization of the early lesions of OA has not been clarified, but many researchers have focused on cartilage and have considered that changes in subchondral bone occur subsequently to the degeneration of cartilage. However, a low bone mineral density, particularly in the knee joint with OA, high bone turnover, and efficacy of bone resorption inhibitors for OA have recently been reported, suggesting that subchondral bone plays an important role in the pathogenesis of OA. This review aims to make a conclusion about advancement in research of subchondral bone in osteoarthritis.
Bone Remodeling ; Bone and Bones ; pathology ; Cartilage ; pathology ; Humans ; Osteoarthritis ; etiology ; pathology ; physiopathology

At present, the numerical model of bone remodeling is inadequate to copy the physiological process of bone remodeling. According to the physiological mechanism of bone remodeling and the anisotropy of bone mechanics properties, an anisotropic bone modeling model with mechanostat was developed, and then was applied to a study on the remodeling evolution of 2D squareplate model. Good results were obtained. The model can be used in the study of implant, osteoporosis and other bone diseases.
Anisotropy ; Biomechanical Phenomena ; Bone Remodeling ; physiology ; Bone and Bones ; physiology ; Models, Biological ; Osteoporosis ; physiopathology

Bone Diseases, Metabolic ; physiopathology ; Bone and Bones ; metabolism ; physiopathology ; Child ; Child Nutrition Disorders ; physiopathology ; Child Nutritional Physiological Phenomena ; physiology ; Humans ; Infection ; physiopathology ; Kidney Failure, Chronic ; physiopathology

Mechanical loading is the main "instructive" factor of bone formation. The mechanism becomes the heat point in the field of bone science, biomedicine project and rehabilitation research. Mechanical vibration is one of the mechanic stimulation. Evidences show that vibration has obvious anabolic effect, and will have a broad landscape in the treatment of osteoporosis. But in the present studies, there were incorporated with the vibration frequency, and intensity, in particularly, few reports about the mechanism of vibration to bone. It will provide theoretic foundation for further systematic, sound research and its clinical application.
Animals ; Biomechanical Phenomena ; Bone Diseases ; physiopathology ; therapy ; Bone and Bones ; physiology ; physiopathology ; Humans ; Musculoskeletal Manipulations ; Osteogenesis ; Vibration ; therapeutic use

The therapeutic effects and mechanisms of traditional Chinese kidney-tonifying drugs in treating osteoporosis have become the focus under study. Pharmacological studies have shown that traditional Chinese kidney-tonifying drugs are promoters for the proliferation of osteoblasts, inhibitors for the activity of osteoclasts, regulators for the estrogen level and its receptor, plays important roles in promoting osteogenesis and suppressing adipogenesis of marrow mesenchymal stem cells (MSCs), modulating the function of OPG/RANK/RANKL system and the metabolism of calcium and phosphorus, as well as antioxidation. The anti-osteoporotic active ingredients and pharmacological action mechanism of traditional Chinese kidney-tonifying drugs are summarized from the perspective of molecular and cell biology in this paper, so as to provide references for the study of their mechanism of anti-osteoporosis and for the development of traditional Chinese kidney-tonifying and bone-strengthening drugs.
Animals ; Bone and Bones ; drug effects ; physiopathology ; Drugs, Chinese Herbal ; pharmacology ; Humans ; Kidney ; drug effects ; physiopathology ; Osteoporosis ; drug therapy ; physiopathology

This study measured the physical properties in bending of the rat femur and compression of the rat first tail vertebra subjected to deep freezing at -80 degrees C for 2 weeks, 6 weeks, 12 weeks and freeze drying. This study also measured the mechanical changes after in vivo allograft of fresh bone, deep freezing(2, 6, 12 weeks) and freeze drying. Analysis for deep freezing groups showed a mean 7.2% decrease in bending strength and 11.0% decrease in compressive strength when compared with the control group, but there was no statistical difference in the duration of deep freezing. The groups of in vivo graft after deep freezing showed 23.1% and 22.2% decrease in bending and compressive strength. There was no statistical difference in the duration of deep freezing. The freeze drying group showed a 9.7% decrease in bending strength and no significant difference in compressive strength. The group of in vivo graft after freeze drying showed a 30.1% and a 41.3% decrease in bending and compressive strength. The above results suggested that there would be some mechanical limitation in using freeze dried graft for supporting implants.
Animal ; Biomechanics ; *Bone Transplantation ; Bone and Bones/*physiopathology ; Femur/physiopathology ; *Freeze Drying ; *Freezing ; Postoperative Period ; Rats ; Rats, Sprague-Dawley ; Spine/physiopathology ; Tail ; Transplantation, Homologous

This study investigated the interrelation between the hypothalamic arcuate nucleus (ARC) and the bone variation of osteoporosis in rats. Four animal models of ovariectomy-induced osteoporosis (OVX), glucocorticoid-induced osteoporosis (GIOP), retinoic acid-induced osteoporosis (RAOP) and senile osteoporosis (SOP) were used to study the influence of osteoporosis on ARC. Ovariectomized rats were further treated with thymopeptide, ciclosporin and exercise respectively to detect the changes of ARC nerve cells number. The results showed that: (1) The OVX, GIOP, RAOP and SOP models were successfully established, showing osteoporosis as well as decrease of the number of ARC nerve cells; (2) Thymopeptide and exercise respectively alleviated the bone loss induced by ovariectomy, accompanied by increase of the number of ARC nerve cells, while ciclosporin further increased the bone loss of ovariectomized rats, accompanied by further decrease of the number of ARC nerve cells. These results suggest that there is a close interrelationship between ARC and osteoporosis in rat. There is a hypothalamus-pituitary-bone (HPB) axis, and HPB axis regulates the mechanism of osteoporosis in rats.
Animals ; Arcuate Nucleus of Hypothalamus ; physiopathology ; Bone and Bones ; physiopathology ; Disease Models, Animal ; Female ; Osteoporosis ; chemically induced ; pathology ; Ovariectomy ; Rats

Bone is a load-bearing organ in human body. Fatigue damage occurs readily at the modest loads to which bone is subjected during its habitual physiological usage. Even bone fracture may occur during vigorous activity. The nature of fatigue damage is that in bone there are very fine microcracks which are smaller than typical microcracks, and may occur at the level of hydroxyapatite crystals. But bone can repair microdamage by bone remodeling. Osteocytes play an important role of signaling during bone remodeling. Some researchers attempted to describe the process of bone fatigue damage and repair by mathematic, mechanical models in order to understand it well and to apply it well in clinical practice.
Animals ; Bone Remodeling ; physiology ; Bone Resorption ; pathology ; physiopathology ; Bone and Bones ; cytology ; injuries ; physiology ; Fractures, Stress ; pathology ; physiopathology ; Humans ; Models, Biological ; Stress, Mechanical