Journal of spinal disorders最新文献

{"title":"Triangulated pedicle screw construct technique and pull-out strength of conical and cylindrical screws.","authors":"Atsushi Ono, Mark D. Brown, Loren L. Latta, Edward L. Milne, David C. Holmes","doi":"10.1097/00002517-200108000-00007","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00007","url":null,"abstract":"To compare the mechanical effectiveness of a new conical screw design with a conventional cylindrical screw design, the screw insertion time, torque, and pull-out strength of single-pedicle screw and triangulated-pedicle screw constructs of each type of screw were compared in human cadaveric vertebral bodies. The time required to insert the conical screws was less than that required for cylindrical screws. Regression analysis revealed a positive correlation between insertion torque and pull-out strength of single and triangulated constructs of each type of screw. The conical screw had a greater increase than the cylindrical screw in the pull-out strength of triangulated pedicle screw constructs. Application of the new conical screw design was significantly faster, and the new screw had better mechanical fixation to the vertebral body than did the conventional cylindrical screw tested.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"323-9"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of beraprost sodium on canine cauda equina function and blood flow using a chronic spinal cord compression model.","authors":"S. Konno, I. Arai, K. Otani, K. Olmarker, S. Kikuchi","doi":"10.1097/00002517-200108000-00009","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00009","url":null,"abstract":"Changes in blood flow after chronic compression were observed in 19 dogs after 10 mmHg compression for 1 week before and 1 hour after the intravenous administration of one of three doses of beraprost sodium (BPS; 30 ng x kg(-1) x min(-1), n = 7; 100 ng x kg(-1) x min(-1), n = 7; and 300 ng x kg(-1) x min(-1), n = 5). The speed of blood flow was calculated using a specially designed microscope equipped with a video camera. Dogs treated with BPS had lesser degrees of reduction in their nerve conduction velocity compared with controls. A vascular mechanism of injury likely explains why BPS-treated dogs had a lesser degree of reduction in their nerve conduction velocities compared with the control population.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"336-8"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of lifestyle and work-related physical activity on the degree of lumbar lordosis and chronic low back pain in a Middle East population.","authors":"M. Nourbakhsh, S. Moussavi, M. Salavati","doi":"10.1097/00002517-200108000-00002","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00002","url":null,"abstract":"The relationship between the degree of lumbar lordosis and chronic low back pain (LBP) has long been speculated. It is postulated that prolonged sitting and sedentary lifestyle might change the degree of lumbar lordosis and cause LBP. The purpose of this study was to determine the effects of lifestyle, exercise, work setting, work intensity, and other demographic factors such as age, height, weight, and gender on the degree of lumbar lordosis and occurrence of LBP. Eight hundred forty subjects between ages 20 and 65 years were equally categorized into four groups: normal male, normal female, males with LBP, and females with LBP. A questionnaire was used to obtain information about the subject's lifestyle, work setting, level of exercise, and work-related physical activity. A flexible ruler was used to measure lumbar lordosis in all subjects. The average degree of lumbar lordosis for all subjects was 37 degrees +/- 13 degrees. Females had greater lumbar lordosis (42 degrees +/- 15 degrees ) than males did (32 degrees +/- 10 degrees ). There was no significant difference in the degree of lumbar lordosis in subjects with different lifestyle (p = 0.97), level of physical activity (p = 0.36), work setting (p = 0.5), and with or without LBP (p = 0.28). The degree of lumbar lordosis was positively related with the number of pregnancies (p = 0.04, r = 0.25), age (p = 0.02, r = 0.1) and height (p = 0.0001, r = 0.31) and negatively related with weight (p = 0.04, r = 0.06) of the subjects. The likelihood of developing LBP was significantly higher in the subjects who had high work-related physical activity (p = 0.03) and those who exercised less often (p = 0.008). We found no significant relationship between LBP occurrence and the degree of lumbar lordosis (p = 0.68), work setting (p = 0.15), height (p = 0.08), weight (p =0.06), and age (p = 0.67) of the subjects. The degree of lumbar lordosis was not different between normal subjects and those with LBP. Lumbar lordosis was not affected by lifestyle, level of physical activity, or type of work setting. Although these factors have not been found to affect the degree of lumbar lordosis, some affected the occurrence of LBP. This finding indicates that the effect of these factors on LBP involves mechanisms other than changing the degree of lumbar lordosis.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"283-92"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lumbar posterolateral fusion alone or with transpedicular instrumentation in L4--L5 degenerative spondylolisthesis.","authors":"Isao Kimura, H. Shingu, M. Murata, H. Hashiguchi","doi":"10.1097/00002517-200108000-00004","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00004","url":null,"abstract":"We retrospectively reviewed 57 patients with L4--L5 degenerative spondylolisthesis (L4--L5 DS) who underwent posterior decompression and posterolateral fusion of L4--L5 without (Group A) or with (Group B) transpedicular screw instrumentation at least 2 years earlier. The clinical results and fusion rate were similar between Groups A and B, that is, a 72.4% satisfactory outcome with a fusion rate of 82.8% in Group A versus 82.1% satisfactory outcome with a 92.8% fusion rate in Group B. Screw instrumentation reduced postoperative low back pain and resulted in a lordotic slip angle of L4--L5. However, in patients with radiologically excessive segmental motion showing a translational motion of 3 mm or more, flexion angulation of -5 degrees or less, and a slip angle of -5 degrees or less at the site of spondylolisthesis (L4--L5), the kyphotic slip angle (L4--L5) tended to increase after surgery. In the future, in patients with radiologically excessive segmental motion, this point should be considered, and surgical techniques should be evaluated. Our results suggest that the validity of the general addition of screw instrumentation to L4--L5 fusion for L4--L5 degenerative spondylolisthesis is low.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"10 5 1","pages":"301-10"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Back muscle contraction patterns of patients with low back pain before and after rehabilitation treatment: an electromyographic evaluation.","authors":"W. Lu, K. Luk, K. Cheung, Y. Wong, J. Leong","doi":"10.1097/00002517-200108000-00001","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00001","url":null,"abstract":"The aims of this study were to conduct a comparative investigation of muscle function between patients with low back pain (LBP) and healthy persons, and to determine whether intensive rehabilitation can change back muscle contraction synergy. Twenty healthy persons and 20 patients with chronic LBP were asked to perform symmetrical and asymmetric tasks. The patients with LBP were tested in the weeks immediately before and after 12 weeks of LBP rehabilitation. Tasks include \"carrying\" weights up and down and with a 45 degrees left rotation. Eight-channel surface electromyographic electrodes were placed on the surface of paraspinal muscles over the lumbar region. Correlations between the right and left corresponding muscles and between values before and after treatment were determined. Lifting capacity for patients with LBP were also measured before and after treatment. Results from electromyographic profiles showed that the muscle activity strategies varied between healthy persons and patients with LBP. The correlation coefficients for spinal muscles have shown very reproducible intrasubject muscle contraction synergies. Unbalanced electromyographic patterns found in patients with LBP given symmetrical tasks were not affected by rehabilitation treatment.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"23 1","pages":"277-82"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blood flow measurement in experimental chronic cauda equina compression in dogs: changes in blood flow at various conditions.","authors":"K. Otani, S. Kikuchi, S. Konno, K. Olmarker","doi":"10.1097/00002517-200108000-00011","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00011","url":null,"abstract":"The purpose of this study was to present a simple method of measurement of blood flow in the nerve root, assess the reliability of this method, and examine the changes of blood flow in chronic cauda equina compression in an experimental setting. A total of 15 dogs were used to determine the blood flow of cauda equina in normal (n = 5), sham (n = 5), and 10 mm Hg compressed cauda equina for 1 week (n = 5). The speed of blood flow was calculated using a specially designed microscope supplied with a video camera. Blood flow in chronic 10 mm Hg compression decreased compared with the sham and normal groups. The kappa value was between 0.75 and 0.96. We conclude that this method might be useful for measurement of blood flow in the nerve root and for confirming the reduction in blood flow of compressed cauda equina.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"343-6"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Occlusion of the left common iliac artery and consecutive thromboembolism of the left popliteal artery following anterior lumbar interbody fusion.","authors":"L. Hackenberg, U. Liljenqvist, H. Halm, W. Winkelmann","doi":"10.1097/00002517-200108000-00015","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00015","url":null,"abstract":"We report on a case of occlusion of the left common iliac artery due to arteriosclerosis and consecutive thrombotic occlusion of the left popliteal artery in a 52-year-old man following anterior retroperitoneal interbody fusion of L4--S1. Initial symptoms included leg pain and numbness of the lateral shank, which were thought to be a result of lumbar nerve root irritation from surgery. Diagnosis was not made until 13 days after surgery, when motor deficits were observed. Angiography showed occlusion of the left common iliac artery and thromboembolism of the left popliteal artery. After thromboendarterectomy of the common iliac artery and thrombectomy of the popliteal artery, motor deficits of the left foot were resolved whereas symptoms of pain and sensory deficits continued. Spine surgeons should be aware of this rare complication in cases of postoperative leg pain or of neurologic deficits in the lower extremity after anterior lumbar interbody fusions.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"365-8"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61370054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Posterior lumbar osteotomy for flat back in adults.","authors":"Z. Noun, P. Lapresle, G. Missenard","doi":"10.1097/00002517-200108000-00005","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00005","url":null,"abstract":"Several studies describe sagittal realignment for flat back and related kyphotic decompensation. Official guidelines for sagittal and the frontal realignment have not been developed. In this retrospective study, the authors examined 10 patients with flat back syndrome and treated a related kyphotic decompensation syndrome by posterior wedge osteotomy. The authors' goal was to determine the efficacy of one-level osteotomy on sagittal and frontal realignment. The effectiveness of osteotomy performed mainly in L3 or L4 was measured in terms of radiographic sagittal and frontal alignment. Sagittal unbalance was improved in all patients. The correction is related to the restitution of lumbar lordosis (5 degrees of lordosis allows 1 cm of sagittal correction). However, frontal balance is difficult to restore or even to maintain. In one patient, it was worsened and required repeated operation. One-level lumbar osteotomy is a safe procedure to correct sagittal unbalance. Peroperative lordosis correction allows reliable correction planning. The remaining problem is planning for frontal balance correction.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"311-6"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disc and vertebral wedging in patients with progressive scoliosis.","authors":"Ian A. F. Stokes, D. D. Aronsson","doi":"10.1097/00002517-200108000-00006","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00006","url":null,"abstract":"A retrospective longitudinal radiographic study of patients with progressive scoliosis was conducted to determine the relative amount of wedging between vertebrae and discs as a function of progression of the scoliosis curve, cause of the scoliosis, and anatomic curve region. Posteroanterior radiographs of 27 patients with idiopathic scoliosis and of 17 patients with scoliosis associated with cerebral palsy were studied. The amount of wedging of vertebrae and discs at the curve apex was measured by the Cobb method and expressed as a proportion of the curve's Cobb angle. On average, the relative amount of vertebral and disc wedging did not differ significantly between initial and follow-up radiographs made after progression of the scoliosis. In both groups of patients, the mean vertebral wedging was more than the disc wedging in the thoracic region; the converse was found in curves in the lumbar and thoracolumbar regions. The patients with scoliosis associated with cerebral palsy had curves that were longer and more commonly in the thoracolumbar and lumbar regions. The relative wedging did not change significantly with curve progression and did not appear to differ by diagnosis. In the management of scoliosis, including small curves, it should be recognized that both the vertebrae and discs have a wedging deformity.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"8 1","pages":"317-22"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Serial changes of herniated intervertebral discs after posterior lumbar discectomy: the relation between magnetic resonance imaging of the postoperative intervertebral discs and clinical outcome.","authors":"M. Nakano, H. Matsui, H. Ishihara, Y. Kawaguchi, R. Gejo, N. Hirano","doi":"10.1097/00002517-200108000-00003","DOIUrl":"https://doi.org/10.1097/00002517-200108000-00003","url":null,"abstract":"To evaluate the relation between the morphologic changes of postoperative intervertebral discs and the clinical outcome after posterior lumbar discectomy, the size of the bulging disc was analyzed prospectively on serial follow-up magnetic resonance images in 26 randomly selected patients. The bulging of postoperative intervertebral discs involved three patterns of reduction: early reduction (n = 15), gradual reduction (n = 6), and late reduction (n = 5). There was a significant difference in the serial changes of subjective symptoms and neurologic function among the three patterns. A late reduction of postoperative disc bulging could cause late recovery of subjective symptoms and neurologic disturbance.","PeriodicalId":77226,"journal":{"name":"Journal of spinal disorders","volume":"14 4 1","pages":"293-300"},"PeriodicalIF":0.0,"publicationDate":"2001-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1097/00002517-200108000-00003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61369743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}