Objective To explore the efficacy of computer-assisted fluoroscopic navigation to guide the treatment of thoracolumbar burst fractures. Methods 18 patients with thoracolumbar unstable fractures were treated with short-segment vertebral pedicle screw fixation guided by computer-assisted fluoroscopic navigation, and fractures were reinforced with CPC cement vertebroplasty. Postimplantatively, the implants' images-error between virtual image of fluoroscopy and X-ray image was measured. Results The implant's location was excellent. All patients were allowed sitting-up or bearing body weight one week after operation. The vertebral height restored 40% postoperatively. 12 months after operation the vertebral height only changed 0.15%. Dynamic X-ray films showed no abnormal segment instability and no instrument breaking. Conclusion Using computer-assisted fluoroscopic navigation to guide the treatment of thoracolumbar burst fractures with CPC vertebroplasty and short-segment pedicle srew fixation could determine the internal fixation approach and let implants to the precise position by one time of X-ray image. It increases the security of pedicle screw fixation and vertebroplasty.

Objective To find an ideal operative method of i nteral fixation for supracondylar a nd in-tercondylar femur comminuted fractures.Methods 30cases with supracondylar and inte rcondylar femur frac-tures were treated percutaneously with retrograde femoral intramedullary nail(GSH)in condition of close reduction technique with assistance of endosc ope and fluroscope.Results The mean 115ml blood loss was seen in 30cases without grafting intraoperatively.Thigh edema recovery and over90?knee flexion motion were seen one week after the operation.All fractu res were united in 6months.Postoperative following-up for 18months revealed the mean 125?knee motion,normal gait in all cases,no varus or valgus defo rmities and no osteoarthotitis.Conclusion The percutaneous tech.of retrograd e nailing with assistance of endosco pe and fluroscope is an ideal surgery method to treat supracondylar and intercondylar femur factures.

Objective To explore clinical outcomes of using improved 2D computer-assisted fluoroscopic navigation of inu'tation 3D vertebra image to guide the pedicle screws in lumbar disease. Methods The anterio posterior, lateral and oblique radiographic materials were got in 43 lumbar disease patients performed neck of vertebra internal fixation, and used the method of improved computer-assisted fluoroscopic navigation to imitate anterio posterior, lateral spinal and axial pedicle virtual image to guide the pedicle screws implantation. Results One hundred and eighty-eight lumbar pedicle screws were implanted, deviation mean position 1.5 mm and mean angle deviation 0.8° in match navigation virtual path with real pedicle screws image. Postoperative CT showed all pedicle screws contained within the pedich, without invasion to lateral and inner bone cortical of the pediele. Deviation mean 1.0° by measured pedicle screws with longitudinal axis vertebra compared with preoperational predict implant screws sagttial angle. Conclusions Improved 2D computer-assisted fluoroscopic navigation is simple and convenient, use anterio posterior,lateral and oblique radiographic materials to imitate anterio posterior,lateral spinal and axial pediele virtual image can precisely guide the pedicle screws implantation.

Objective To explore clinlical outcomes of using improved computer-assisted fluoroscopic navi-gation to guide the percutaneous vertebroplasty to treat multiple osteoporotic spinal compression fractures. Methods Twenty-eight multiple osteoporotic spinal compression fractures patients with 73 painful vertebral body were got an-terio posterior,lateral and oblique radiographic imaging by using computer-assisted fluoroscopic navigation to imitate anterior- posterior. Lateral spinal and axial pedicle virtual image was obtained to guide the percutaneous kyphoplas-ty. Results All painful vertebral body were one-sided punctured,all percutaneous kyphoplasties were succeed by guiding with computer-assisted fluoroscopic navigation. Navigation virtual puncture needle image basically matched with reality view. PMMA dosage was 2.5 ～ 4 ml. Postioporational CT showed that the PMMA filled spinal focus very well. 11 cases completely relieved and 17 cases partially relieved. Conclusion Using improved computer-assisted fluoroscopic navigation to guide the PKP to treatment multiple osteoporotic spinal compression fractures decreases op-erative time and radiation injury. It is a safe,precise,minimally invasive method.

Objective To investigate the relation between serum leptin/tumor necrosis factor-α (TNF-α)and malnutrition in patients with chronic obstructive pulmonary disease (COPD) and stable chronic cor pulmonale (CCP) at high altitude. Methods Totally 162 COPD and CCP patients and 40 normal controls (group C) were studied. COPD and CCP patients were divided into malnutrition group (group A, n = 104) and normal nutrition group (group B, n =58) according to the nutritional parameters. Levels of serum leptin and TNF-α were measured by enzyme-linked immunosorbent assay (ELISA). Results Body mass index (BMI), percentage of normal body weight (NW%), triceps skinfold thickness (TSF), mid-upper arm circumference (MAC), serum albumin (ALB) ingroupA[(17.4±1.8) kg/m2, (82.3±4.3)%, (7.0±2.6) mm, (17.8±2.8) cm, (30.3±3.9)g/L, respectively] were significantly lower than those in group B and group C [(21.8 ± 2.0) kg/m2,(98.6±5.5)%, (9.3±2.6) mm, (21.5±2.9) cm, (36.2±3.8) g/L, and (23.1±2.3) kg/m2,(102.2±5.2)%, (9.7±3.8) mm, (22.1±2.8) cm, (36.8±3.9) g/L, respectively; all P＜0. 01].The levels of serum leptin and TNF-α in group A [(9.5 ±1. 8) ng/ml and (17.3 ±2. 2) ng/ml, respectively]were significantly higher than those in group A and group C [(7.3 ± 2. 0) ng/ml, (13.5 ± 2. 3) ng/ml; and (6. 7 ±2. 3) ng/ml, (12. 8 ±2. 1) ng/ml, respectively; all P ＜0.01). However, they were not significantly different between group A and group B (all P ＞ 0. 05). The level of leptin was negatively correlated with BMI (r=-0.745, P=0. 0005), NW% (r= -0.887, P=0. 0005), TSF (r= -0.725, P=0. 0005), MAC (r= -0. 761, P=0. 0005), serum albumin (r= -0. 558, P=0. 0005) in group A, and was positively correlated with TNF-α (r = 0. 527, P = 0. 0005). Conclusion Serum leptin and TNF-α correlate with malnutrition in patients with COPD and CCP at high altitude.

Objective To compare the surgical outcomes between microsurgery lumbar discectomy and microendoscopic discectomy for lumbar disc herniation. Methods A prospective study was conducted on the surgical procedures for lumbar disc herniation.The target of our study was a group of 33 patients who underwent surgery by microsurgery lumbar discectomy(MSLD group)and 36 patients who underwent surgery by microendoscopic discectomy(MED group).The items investigated were the operation time,amount of bleeding,duration of hospitalization,pre-and postoperative scores based on judgment criteria for treatment of lumbar spine disorders established by the Japanese Orthopaedic Association score,visual analog scales (VAS,0 to 10) for lumbago and sciatica before surgery and at discharge,perioperative complications.Results The mean duration of follow-up was 2 years and 2 months (11 months to 4 years).There were no significant differences between the 2 surgical procedures in the frequency of the pre-and postoperative Japanese Orthopaedic Association scores or postoperative VAS for lumbar pain and sciatica,operation time and duration of hospitalization. Statistically significant differences were observed in amount of bleeding and operation time,but the differences were not large, and may not have been clinically significant.Conclusion Both microsurgery lumbar discectomy and microendoscopic discectomy are appropriate for lumbar disc herniation.

Aim To investigate whether pioglitazone has protective effect against glutamate induced neurotoxicity in cultured cortical neurons and its possible molecular mechanisms underlying pioglitazone's neuroprotective effects.Methods The cortical neurons were taken from newborn rats and used for experiments 7 days after culture.The neurons were randomly divided into control group;glutamate group; glutamate+piogli-tazone group;glutamate+SP600125 group;SP600125 group.Cell viability was determined by MTT.The morphology change of neurons was observed under a fluorescence microscope with fluorescence dye Hoechst 33258.Immunostaining was used to investigate the expression of phospho-ATF2 in neuronal cells.Western blot was performed to investigate the protein level of phospho-JNK1 and total JNK1.Results Pioglitazone markedly reduced the damage of cortical neurons caused by glutamate.Pioglitazone also significantly inhibited glutamate induced up-regulation of phospho-JNK1 protein level and phospho-ATF2 expression.SP600125, an inhibitor of JNK, antagonized the toxicity induced by glutamate.Conclusions Pioglitazone can protect cultured cortical neurons from glutamate induced damage.The protective effect of pioglitazone appears to be associated with inhibiting the c-Jun N-terminal protein kinase signaling pathway.