OBJECTIVETo investigate the damage characteristics and biomechanical mechanisms of the thoracolumbar vertebral bursh fracture during the impact loading.

METHODSFrom September 2008 to October 2009, 10 fresh human thoracolumbar spine specimens were collected for experimental model and divided into two groups. Biomechanical static and dynamic impact strength test were performed respectively in two groups. The static and dynamic data from thoracolumbar vertebrae shock response in different loads were observated.

RESULTSThoracolumbar yield load was (5 280.00 +/- 354.2) N, yield displacement was (13.32 +/- 2.07) mm, the limit load was(6 590.00 +/- 249.20) N, ultimate displacement was (20.60 +/- 2.57) mm, load speed was 0.02 g, and the average limit load of dynamic mechanical properties of thoracic and lumbar vertebrae was (14 425.60 +/- 1101.52) N, the average reaction time load was (17.29 +/- 2.04) ms, the average of acceleration was (36.80 +/- 2.81) g, the dynamic displacement was (45.11 +/- 1.13) mm.

CONCLUSIONThoracolumbar vertebral burst fracture is a serious injury caused by the release of high-energy moment, the role of biomechanical forces are in a pattern of pulse change, thoracic and lumbar vertebrae present with the viscoelastic properties of biological materials.

Biomechanical Phenomena ; Cadaver ; Humans ; Lumbar Vertebrae ; injuries ; Spinal Fractures ; metabolism ; physiopathology ; Stress, Mechanical ; Thoracic Vertebrae ; injuries

OBJECTIVETo study the association between vitamin D status and bone mineral density(BMD) in urban postmenopausal women in Beijing.

METHODSA total of 400 community-dwelling women older than 60 (median age 67.8 years) were selected randomly from 17 community of 3 districts in Beijing by cluster sampling method from May to July, 2008. Serum 25(OH)D concentrations were measured by radioimmunoassay, using the DiaSorin kit, America. The objects were assigned into four groups: vitamin D deficient group (group A, 25(OH)D < 25 nmol/L), insufficient group(group B, 25 nmol/L < 25(OH)D < or = 50 nmol/L), normal group (group C, 50 nmol/L < 25(OH)D < or = 75 nmol/L) and enough group (group D, 25(OH)D > 75 nmol/L). The BMD at total, lumbar spine (L(2-4)) and proximal femur were measured by dual-energy X-ray absorptiometry (DEXA).

RESULTSThe mean concentration of serum 25(OH)D concentration was (36.0 +/- 14.6) nmol/L, BMD at total and proximal femur were respectively (0.829 +/- 0.090) and (0.679 +/- 0.106) g/cm(2). The mean BMD at total of group A, B, C + D were respectively (0.811 +/- 0.077), (0.825 +/- 0.088) and (0.864 +/- 0.112) g/cm(2)(F = 16.93, P < 0.01), and BMD at proximal femur of group A, B, C + D were respectively (0.666 +/- 0.107), (0.673 +/- 0.099) and (0.725 +/- 0.117) g/cm(2)(F = 18.36, P < 0.01). The 25(OH)D level was positively correlated with BMD at total body and proximal femur (r values were 0.17 and 0.18, both P values < 0.05).

CONCLUSIONVitamin D status was highly correlated with BMD at lumbar spine (L(2-4)), proximal femur, pelvis and limbs for the postmenopausal older women.

Aged ; Aged, 80 and over ; Bone Density ; China ; Female ; Femur ; metabolism ; Humans ; Lumbar Vertebrae ; metabolism ; Middle Aged ; Postmenopause ; Vitamin D ; blood

OBJECTIVE: To investigate the effect of the course and menopause on the change of bone mineral density (BMD) in female patients with hyperthyroidism. METHODS: BMDs of hip and lumbar vertebrae were measured by dual-energy X-rays absorptiometry(DEXA) in the female patients (n=192, aged 14 approximately 72). Patients were divided into 2 groups (premenopausal and postmenopausal)and 2 subgroups(short-course and long-course). The BMDs were compared between those of age-matched, weight-matched, height-matched and body mass index matched control subgroups. RESULTS: In the premenopausal hyperthyroidic patients, only the BMDs of the second and total lumbar vertebrae with long-course were significantly lower than those of short-course group(P< 0.05). In the post-menopausal group with the long-course,each BMD measured had a lower level compared with that with short-course, of which the hip and the second lumber vertebrae were evident (P< 0.01). CONCLUSION The course and menopause have an effect on the BMDs in female patients with hyperthyroidism.
Adolescent ; Adult ; Aged ; Bone Density ; Female ; Hip Joint ; Humans ; Hyperthyroidism ; metabolism ; Lumbar Vertebrae ; Menopause ; metabolism ; Middle Aged

To explore the main clinical manifestation (lower back pain and ischialgia) of LDH with immunologic method and study the relationship and clinical significance of the cardinal symptom (pain) and immune comple (IC), macrophage (MP),interleukin-1 (IL-1), interleukin-6 (IL-6), tumor necrosis factor (TNF), prostaglandin E2 (PGE2), phosphatidase A2 (PLA2), nitrogen monoxidum (NO) expressing, finding a new way in order to prevention and cure of LDH. We will review immunologic theory of LDH pain.
Cytokines ; metabolism ; Humans ; Intervertebral Disc Displacement ; complications ; immunology ; metabolism ; Lumbar Vertebrae ; pathology ; Nitric Oxide ; metabolism ; Pain ; etiology ; immunology ; metabolism ; Phospholipases A2 ; metabolism

OBJECTIVETo explore the analgesic mechanism of small knife needle for treating transverse process syndrome of the third vertebra (TPSTV) by observing peripheral and central changesof β-endorphin (β-EP) and enkephalin (ENK) contents.

METHODSTotally 30 Japanese white big-ear rabbits of clean grade were divided into 5 groups according to random digit table, i.e., the normal control group, the model group, the small knife needle group, the electroacupunture (EA) group, and the small knife needle plus EA group, 6 in each group. The TPSTV model was established by inserting a piece of gelatin sponge into the left transverse process of 3rd lumbar vertebrae. Rabbits in the small knife needlegroup were intervened by small knife needle. Those in the EA group were intervened by EA at bilateralWeizhong (BL40). Those in the small knife needle plus EA group were intervened by small knife needleand EA at bilateral Weizhong (BL40). Contents of β-EP and ENK in plasma, muscle, spinal cord, and hypothalamus were determined after sample collection at day 28 after modeling.

RESULTSCompared with the normal control group, contents of β-EP and ENK in plasma and muscle increased significantly, and contents of β-EP and ENK in spinal cord and hypothalamus decreased significantly in the model group (P < 0.05, P < 0.01). Contents of β-EP and ENK approximated normal levels in the three treatment groups after respective treatment. Compared with the model group, the content of β-EP in muscle decreased, and contents of β-EP and ENK in hypothalamus increased in the three treatment groups after respective treatment (P < 0.05). There were no significant difference among the three treatment groups (P > 0.05).

CONCLUSIONSSmall knife needle treatment and EA had benign regulation on peripheral and central β-EP and ENK in TPSTV rabbits. Small knife needle treatment showed better effect than that of EA.

Acupuncture Points ; Animals ; Electroacupuncture ; Enkephalins ; metabolism ; Hypothalamus ; metabolism ; Lumbar Vertebrae ; pathology ; Muscle, Skeletal ; metabolism ; Needles ; Rabbits ; Random Allocation ; Spinal Cord ; metabolism ; Spinal Diseases ; therapy ; beta-Endorphin ; metabolism

BACKGROUNDWith aging, the human fracture risks gradually increase. This is mainly due to the corresponding changes of the biomechanical parameters of human bone presents with aging. We measured the microstructural parameters of lumbar bone from women in several age groups by micro-computed tomography and scanning electron microscopy. We observed changes in lumbar cancellous bone mineral density and in biomechanical parameters with aging to elucidate the relationship between age and risk of fracture. We provide theoretical support for human pathology, fracture risk increased with age and the individualized of each age group.

METHODSThirty-two fresh L3 vertebral bodies were donated from 32 women, aged 20-59 years and were divided into four age groups: 20 to 29 years (group A); 30 to 39 years (group B); 40 to 49 years (group C); and 50 to 59 years (group D). Conventional lumbar separation was performed by removing soft tissue and subsidiary structures, leaving only the vertebral body. The vertebral body was cut into halves along the median sagittal plane, maintaining the upper and lower end-plates of each half, and used for biomechanical, morphological, and density measurements.

RESULTSComparing group A to B, the rod-like trabecular thickness (Tb.Th) decreased; the trabecular spacing (Tb.Sp) increased; the plate-like Tb.Th decreased; bone mineral density, tissue mineral density, bone volume fraction, and bone surface fraction decreased, and the elastic modulus and the ultimate stress decreased (all changes P < 0.05). Similar significant (P < 0.05) trends were obtained when comparing group C to D. With aging, the collagen cross-linking capacity declined, the thickness of the collagen fibrils was variable (ranging from almost the same to loose, sparse, or disordered), and the finer collagen fibrils between the thick filaments were disorganized.

CONCLUSIONSIn women aged 20 to 59 years, the rod-like and plate-like Tb.Th of the vertebral body decreased, while Tb.Sp increased. Additionally, the density, elastic modulus, and ultimate stress of the cancellous bone decreased with age. These associated changes in bone microstructure, density, and biomechanics with age may lead to an increasing risk of osteoporosis and fracture.

Adult ; Bone Density ; physiology ; Female ; Humans ; Lumbar Vertebrae ; metabolism ; ultrastructure ; Microscopy, Electron, Scanning ; Middle Aged ; X-Ray Microtomography ; Young Adult

PURPOSE: Long-term administration of anticonvulsants for children with convulsive disorder may cause osteomalacia, depending on dosage, duration, types, and combination of anticonvulsants administered. This study was performed to examine the effect of anticonvulsant drugs on bone mineral density in epileptic children. METHODS: Forty-eight epileptic children aged 3 to 15 years were enrolled in this study. They were treated with antiepileptic drugs such as carbamazepine(group I), valproic acid(group II), or a combination of several drugs(group III) for long periods time from 6 months to 84 months. Bone mineral density was measured using dual energy absorptiometry(Madison, Wisconsin, U.S.) on the lumbar vertebrae during the period of Dec. 1, 1996-Jul. 1, 1997. Calcium, phosphorus, and alkaline phosphatase were also concomitantly measured in the sera of subjects for comparative analysis. Statistical analysis was performed using drugs and duration of therapy through specific z-score. Analysis for bone mineral density of anticonvulsant treated subjects were compared to results with published data. RESULTS: Bone mineral density was significantly decreased only in the carbamazepine-treated group, especially in children who received carbamazepine therapy for more than 18months. Z-scores of the other groups were also slightly decreased though they were not significant. And serum concentration of calcium and phosphorus levels were within normal ranges, but alkaline phosphatase levels were significantly increased(P<0.01). CONCLUSION: Measurement of bone mineral density might be required in epileptic children who received antiepileptic drugs. Administration of vitamin D should also be recommended in epileptic children, especially if they have been treated with antiepileptic drugs for a long time.
Alkaline Phosphatase ; Anticonvulsants* ; Bone Density ; Calcium ; Carbamazepine ; Child* ; Humans ; Lumbar Vertebrae ; Metabolism* ; Osteomalacia ; Phosphorus ; Reference Values ; Vitamin D ; Wisconsin

OBJECTIVETo investigate sex hormone deficiency related osteoporosis and efficacy of different therapies.

METHODSOrchiectomized and ovariectomized rat models are used to investigate sex hormone deficiency related osteoporosis and efficacy of different therapies. A rat vertebral body can be longitudinally divided into central portion, which contain more trabecular bone, and para-endplate portions which contain more compact bone. In matured male and female Wistar and Sprague-Dawley rat lumbar spines, we investigated baseline bone mineral density (BMD) characteristics and the differential segmental responses in bone loss within the lumbar vertebral body post gonadal surgery with clinical multidetector computed tomography.

RESULTSPara-endplate sections had a higher BMD than central sections. The cephalad para-endplate sections had a higher BMD than the caudad para-endplate sections. Eight weeks after gonadal removal, there was more bone loss in central sections than para-endplate sections. The relative difference of bone loss between para-endplate and central sections was more apparent in male rats than in female rats. There was more bone loss in caudad sections than cephalad sections; this lead to a further increase of BMD difference between caudad para-endplate sections and cephalad para-endplate sections post gonadal surgery.

CONCLUSIONThe approach described in this study provided a consistent way to study BMD change within predominantly compact bone portion and trabecular bone portion of the vertebral body.

Animals ; Bone Density ; drug effects ; Female ; Gonadal Steroid Hormones ; deficiency ; metabolism ; Lumbar Vertebrae ; physiology ; Male ; Orchiectomy ; Ovariectomy ; Rats ; Sex Factors

PURPOSE: To examine the influence of ovariectomy (OVX) on bone turnover and trabecular bone mass at the 3 clinically important skeletal sites in mature cynomolgus monkeys. MATERIALS AND METHODS: Six female cynomolgus monkeys, aged 17-21 years, were randomized into 2 groups by the stratified weight: the OVX and sham-operation groups (n = 3 in each group). The experimental period was 16 months. Lumbar bone mineral density (BMD) in vivo and serum and urinary bone turnover markers were longitudinally measured, and peripheral quantitative computed tomographic and bone histomorphometric analyses were performed on trabecular bone of the lumbar vertebra, femoral neck, and distal radius at the end of the experiment. RESULTS: OVX induced in a reduction in lumbar BMD compared with the sham controls and the baseline, as a result of increased serum levels of bone-specific alkaline phosphatase and urinary levels of cross-lined N- and C-terminal telopeptides of type I collagen. Furthermore, OVX induced reductions in trabecular volumetric BMD and trabecular bone mass compared with the sham controls, with increased bone formation rate at the lumbar vertebra, femoral neck, and distal radius. CONCLUSION: The results indicated that OVX in mature cynomolgus monkeys (17-21 years of age) increased bone turnover and induced trabecular bone loss at the three skeletal sites compared with the sham controls. Thus, mature cynomolgus monkeys could be utilized for preclinical studies to examine the effects of interventions on bone turnover and trabecular bone mass at the 3 clinically important skeletal sites.
Alkaline Phosphatase/blood ; Animals ; *Bone Density ; Collagen Type I/urine ; Female ; Femur Neck/metabolism ; Lumbar Vertebrae/metabolism ; Macaca fascicularis/*physiology ; Ovariectomy/*adverse effects ; Radius/metabolism ; Random Allocation

Previous case-control studies have shown various degrees of inverse correlation between osteoarthritis (OA) and osteoporosis (OP). The aim of this study was to examine the relationship between osteophytes at the cervical , lumbar vertebrae and knee, and the bone mineral density (BMD) of lumbar spine. We analyzed the data on 4091 female patients (aged 13 to 92 years). Osteophyte was defined by X ray examination. BMD of the lumbar spine (LS) was measured by dual energy X-ray absorptiometry (Lunar DPX). The association of osteophytes with BMD and osteophytes at different sites and different degrees were assessed by covariance analysis. Adjustments were made for age and body mass index. The relationship between osteophytes and BMD was analyzed by Binary Logistic Regression. BMD at each site was greater in the female with osteophytes (L4 BMD: P < 0.01, Mean BMD: P < 0.05); the relationship between osteophytes and osteoporosis and that between duration of osteophytes and osteoporosis were inversely correlated (P < 0.01). It confirms the existence of an inverse relationship between osteophytes and OP while a positive relationship is between age, body mass index and osteoporosis.
Absorptiometry, Photon ; Adolescent ; Adult ; Aged ; Aged, 80 and over ; Bone Density ; Female ; Humans ; Lumbar Vertebrae ; metabolism ; pathology ; Middle Aged ; Osteophyte ; metabolism ; Osteoporosis ; metabolism ; Young Adult