Objective To probe the reasons of failure of caged cervical intervertebral fusion and define the indications, operative techniques and short term results of the revision surgery. Methods Twenty-seven cases of caged cervical fusion were revised. The indication for fusion was cervical disc herniation in four cases and cervical spondylotic mylopathy in 23 cases. Of the 27 cases, there were 8 single levels, 15 double levels, 4 three levels. The intervals from revision to primary fusion were 2-25 months, 10.3 months in average. Patients presented discomfort (22 cases) and local pain of neck and shoulder (9 cases) or paralysis (19 cases) preoperatively. JOA grade was mean 11.6 points before revision. Radiographic examination showed the mean lordosis loss was 7.1 mm, the mean interbody height loss was 3.9 mm. 24 patients presented kyphosis. Occluded neighboring cages were found in multilevel cases. Nonunion was founded in 6 cases, unstable in 9 cases, compression still existed in 19 cases. Removal of cages and then decompression, bone grafting and anterior plating fixation were performed in 23 cases (29 cages). 16 patients underwent further posterior fixation. Posterior revisions underwent in another 4 cases (9 cages), including laminectomy and reshaping the lordosis and lateral mass screw plating fixation. Results All the cases were followed-up from 4 to 26 months, 11.7 months in average. The local symptoms released in 81% patients. Nerural deficit symptoms improved in 58% patients. Mean JOA grade was 14.2 points after revision. In 23 cases of anterior approach revisions, 17 cases obtained bone healing within 3 months, while 6 cases got delayed union. The kyphosis was corrected, and the intervertebral height increased 3 mm in average. There were no nerural impaction or failed internal fixation. Conclusion Deficient decompression, sinking of the cage into the cancellous bone of the vertebral body and subsequent kyphosis and bone graft nonunion consist of the main causes for revision surgery. The indications of revision are aggressive neurologic symptom, unstable or deformity of the cervical spine. Cage removal, completely decompression, bone grafting and secure fixation are major steps of revision procedure. In case of more than 3 fusion levels, further posterior fixation is advised.

BACKGROUND: The spinal instability would accelerate the degeneration of normal disk. The injuries of anterior longitudinal ligament (ALL) and intervertebral disk were usually caused by cervical trauma, which leaded to spinal instability. Currently, there were few animal researches about the degeneration of injured intervertebral disk affected by ALL destruction.OBJECTIVE: To investigate the degeneration of injured intervertebral disk after spinal instability in the rabbit model of different degrees of ALL and disc destruction.METHODS: A total of 24 New-Zealand rabbits were randomly divided into intervertebral disk injury group (Group A, n=6), partial injury of ALL with disc injury group (Group B, n=6), injury of bony attachment point of ALL with disc injury group (Group C, n=6) and entirely injury of ALL with disc injury group (Group D, n=6). The L2-L3 intervertebral disk and ALL were injured through abdominal cavity. Different groups received different treatments. Computed tomography (CT) scans of the injured disc were performed at the postoperative 4 and 8 weeks, and the middle high of injured discs was calculated on CT sagittal reconstruction. Three rabbits were selected from each group. Hematoxylin-eosin staining of injured disc was performed after the animals were killed. Results were examined under the light microscope.RESULTS AND CONCLUSION: (1) At postoperative 4 weeks, the middle height of injured discs in Group D was decreased significantly compared with Group A (P < 0.05). There were hyperosteogeny and calcification in Group C and Group D. There were nucleus pulposus cells reduction and inflammatory reaction in Group C and Group D on histological staining. (2) At postoperative 8 weeks, the middle height of injured discs respective was decreased significantly compared with Group A (P < 0.05). The hyperosteogeny and calcification became clearer in Group C and Group D than before. There were morphologic changes of nucleus pulposus cells and fibrillation by hematoxylin-eosin staining, and the degree of disc degeneration was Group D > Group C > Group B > Group A. (3) In conclusion, the injury of ALL would accelerate the degeneration of correspondingly injured disk, and the degree of injury of ALL was positively correlated with the degeneration of disk.

BACKGROUND:Under hypoxic environment, hypoxia-inducible factor 1α plays a dualregulatory role in cel apoptosis. Severity of hypoxia is the key to determine whether cels appear to have apoptosis or adapt to survive. When the cels are exposed to chronic or extreme hypoxia, a lack of protection mechanisms from hypoxia-inducible factor-1α can induce cel apoptosis. OBJECTIVE: To research the expression of hypoxia-inducible factor 1α in human lumbar nucleus pulposus of different herniated types and its relationships with cel apoptosis. METHODS: The nucleus pulposus was harvested from 60 cases of herniation of lumbar intervertebral discs, L4-5 in 41 cases and L5-S1 in 19 cases. The nucleus pulposus tissues were equaly divided into protruded and sequestered groups. Meanwhile, the nucleus pulposus tissues from another 10 cases of lumbar spine fracture were taken as control group. Expression of hypoxia-inducible factor 1α and apoptosis of lumbar nucleus pulposus cels were observed and detected with immunohistochemical technique and TUNEL method. Correlation of hypoxia-inducible factor 1α and apoptosis in human lumbar nucleus pulposus of different herniated types was analyzed. RESULTS AND CONCLUSION: The expression of hypoxia-inducible factor 1α was visualized in each case, but it was significantly higher in the sequestered group than in the protruded group and control group (P < 0.01). Apoptosis of nucleus pulposus cels were found in al the three groups, but the apoptotic rate was also higher in the sequestered group than in the protruded group and control group (P < 0.01). Expression of hypoxia-inducible factor 1α was positively correlated with cel apoptosis in human lumbar nucleus pulposus (P < 0.01). Overal, the expression of hypoxia-inducible factor1α in degenerative human lumbar nucleus pulposus is associated with herniated types, which is the highest in the sequestered type. The relationship between hypoxia-inducible factor 1α and apoptosis is positive.

BACKGROUND:Under hypoxic environment, hypoxia inducible factor-1 plays an important role in regulation of hypoxia-induced gene expression in the intervertebral disc. Hypoxia-inducible factor-1 consists of α and βsubunits, and which hypoxia inducible factor-1α determines the stability and activity of hypoxia-inducible factor-1. OBJECTIVE: To observe the expression of hypoxia inducible factor-1α in the human lumbar nucleus pulposus of different herniated types and to judge their relationships. METHODS:A total of 60 nucleus pulposus samples were harvested from the lumbar vertebra, including 41 from L4-5 and 19 from L5-S1, and then divided into protruded group and sequestered group, with 30 cases in each group. Meanwhile, another 10 samples of lumbar nucleus pulposus served as controls. Hematoxylin-eosin staining and streptavidin-biotin peroxidase complex immunohistochemical technique were used to observe the expression of hypoxia inducible factor-1α in the human lumbar nucleus pulposus in different groups. RESULTS AND CONCLUSION:The expression level of hypoxia inducible factor-1α was (58.2±7.5)% in the sequestered group, (27.3±2.3)% in the protruded group, and (10.5±4.7)% in the control group, which was significantly higher in the sequestered group than the other two groups (P < 0.01). These findings indicate that the expression of hypoxia inducible factor-1α in the lumbarnucleus pulposus is associated with the herniated types, which is the highest in the prolapse sequestered type.

Objective To investigate the characteristics of the objective sleep disturbances in Parkinson' s disease (PD) and the factors related to it.Methods One hundred and one PD patients and 90 age- and sex- matched controls underwent a video-polysomnography.The sleep parameters and its related factors in two groups were analyzed.Results Sleep latency was not statistically different in comparing two groups.PD patients had a higher percentage of non-rapid eye movement( non-REM ) sleep stage 1 and a lower percentage of non-REM sleep stage 2 compared with controls ( 27.9 ± 1 7.8 vs 21.2 ± 11.7,t =3.034,P =0.003 ;47.8 ± 17.4 vs 54.7 + 12.9,t =- 3.043,P =0.003 ).Reduced sleep efficiency,decreased the proportion of slow wave sleep and REM sleep,increased awake time and longer REM sleep latency occurred in PD patients.There were no significant differences of these above parameters.Some sleep parameters in PD patients were correlated with advancing age,the severity of PD,and the degree of depression.The index of periodic leg movements in sleep (PLMSI) of 41 PD patients (40.6％ ) was more than 15.These PD patients didn' t complain corresponding symptoms about their legs.The PLMSI in PD patients were significantly higher than the controls.PLMSI increased with aging in the PD group( r =0.261,P ＜0.01 ).PD patients didn' t suffer significantly lower apnea- hypopnea index and oxygen desaturation index.The lowest SPO2 ( L-SPO2 ) increased in the PD group.REM sleep without atonia occurred in 83 patients (82.2％) with PD.Thirty-eight patients (37.6％) were diagnosed with REM sleep behavior disorder (RBD).The incidences of REM without atonia and RBD in the PD group were significantly higher than in the control s(0 and 8 patients (8.9％),x2 =42.271,102.480; both P ＜ 0.01 ).Conclusions The sleep parameters in PD patients are changed.For PD patients,there is no difficulty in falling asleep.The PD patients also have sleep structure disorder and difficulty in maintaining sleep.The sleep parameters are correlated with advancing age,the severity of PD,and the degree of depression in PD.PLMS don' t lead to sleep disturbances in PD patients.The blood oxygen saturation don' t decrease severely when PD patients suffer apnea or hypopnea.RBD occur more frequently in PD patients.

OBJECTIVETo develop an HPLC method for the quantification of six active components in three species (Swertia davidi, S. nervosa and S. mussotii) .

METHODThe determination was performed on a Hypersil BDS colunm (4. 6 mm x 200 mm, 5 microm). Acetonitrile and 0.5% phosphoric acid solution were used as the mobile phases with a gradient elution. The flow rate was 1.0 mL x min(-1). The UV detection wavelength was at 240, 274, 325 and 334 nm. The column oven temperature was at 25 degrees C.

RESULTSix components were separated commendably in 60 minutes. The calibration curves of swertiamarin, gentiopicroside, norswertianolin, swertianolin, demethylbellidifolin and bellidifolin were in good linearity over the range of 0.520-20.8, 0.202-8.06, 0.107-4.28, 0.097-3.86, 0.094-3.77, 0.101-4.02 microg, respectively (r = 0.999 9). The average recoveries were 98.7%, 98.1%, 98.3%, 98.8%, 98.1% and 98.6%, respectively, and the RSD were less than 3.0% (n = 6).

CONCLUSIONThe method is accurate,simple and reproducible, and can be used to control the quality of Swertia.

Chromatography, High Pressure Liquid ; instrumentation ; methods ; Drugs, Chinese Herbal ; analysis ; Glucosides ; analysis ; Iridoid Glucosides ; Iridoids ; analysis ; Pyrones ; analysis ; Swertia ; chemistry ; Xanthones ; analysis

Objective To measure the sagittal diameter of vertebral plate(SDVP) in the developmental cervical stenosis (DCS) group by cervical vertebral lateral X-ray film to provide a new idea for diagnosing DCS.Methods A total of 401 cervical vertebral X-ray films conforming to the standard were collected and divided into the non-DCS group and DCS group.On the lateral radiographs of the cervical spine,SDVP(the distance from the posterior edge of zygapophysial joint to spinal laminar line) at C3-C6 segments was measured,and the differences in SDVP were compared between the non-DCS group and DCS group.Then the differences were also compared between sexes.Results SDVP at C3-C6 segments was(5.23 ± 0.93),(5.55 ± 0.94),(5.64±0.97) and (5.12±0.84) mm in the non-DCS group,and (3.87±1.11),(3.66± 1.00),(3.77±0.92) and (2.99±0.72) mm in the DCS group,the differences between the two groups were statistically significant(P＜0.05),moreover SDVP had the same statistical difference between sexes(P＜0.05).Conclusion SDVP at C3-C6 segments in DCS patients is significant shortened compared with the normal person.

Humans ; Parkinson Disease/therapy* ; Phototherapy ; Sleep Wake Disorders