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Retrieval analysis of PEEK rods for posterior fusion and motion preservation.

Eur Spine J. 2013 Jul 26;

Authors: Kurtz SM, Lanman TH, Higgs G, Macdonald DW, Berven SH, Isaza JE, Phillips E, Steinbeck MJ

Abstract
INTRODUCTION: The purpose of this study was to analyze explanted PEEK rod spinal systems in the context of their clinical indications. We evaluated damage to the implant and histological changes in explanted periprosthetic tissues.
METHODS: 12 patients implanted with 23 PEEK rods were revised between 2008 and 2012. PEEK rods were of the same design (CD Horizon Legacy, Medtronic, Memphis TN, USA). Retrieved components were assessed for surface damage mechanisms, including plastic deformation, scratching, burnishing, and fracture. Patient history and indications for PEEK rod implantation were obtained from analysis of the medical records.
RESULTS: 11/12 PEEK rod systems were employed for fusion at one level, and motion preservation at the adjacent level. Surgical complications in the PEEK cohort included a small dural tear in one case that was immediately repaired. There were no cases of PEEK rod fracture or pedicle screw fracture. Retrieved PEEK rods exhibited scratching, as well as impressions from the set screws and pedicle screw saddles. PEEK debris was observed in two patient tissues, which were located adjacent to PEEK rods with evidence of scratching and burnishing.

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Simple prediction method of lumbar lordosis for planning of lumbar corrective surgery: radiological analysis in a Korean population.

Eur Spine J. 2013 Jul 30;

Authors: Lee CS, Chung SS, Park SJ, Kim DM, Shin SK

Abstract
PURPOSE: This study aimed at deriving a lordosis predictive equation using the pelvic incidence and to establish a simple prediction method of lumbar lordosis for planning lumbar corrective surgery in Asians.
METHODS: Eighty-six asymptomatic volunteers were enrolled in the study. The maximal lumbar lordosis (MLL), lower lumbar lordosis (LLL), pelvic incidence (PI), and sacral slope (SS) were measured. The correlations between the parameters were analyzed using Pearson correlation analysis. Predictive equations of lumbar lordosis through simple regression analysis of the parameters and simple predictive values of lumbar lordosis using PI were derived.

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PMMA embolization to the left dorsal foot artery during percutaneous vertebroplasty for spinal metastases.

Eur Spine J. 2013 Jul 26;

Authors: Panagiotis I, Panagiotis K, Vasilios V

Abstract
PURPOSE: Distal arterial embolization to the foot with PMMA during vertebral augmentation has not been previously reported. We report a rare case of distal PMMA embolization to the dorsal foot artery during ipsilateral percutaneous lumbar vertebral augmentation in a patient with spinal osteolytic metastases.
METHODS: A 68-year-old woman was admitted because of severe disabling low back pain. Plain roentgenograms, MRI and CT-scan revealed osteolysis in the L4 and L5 vertebral bodies with prevertebral soft tissue involvement. Percutaneous vertebroplasty with PMMA was performed in L2 to L5 vertebrae under general anesthesia. Intraoperatively, leakage into the segmental vessels L3 and L5 was observed.
RESULT: Four hours after the procedure the clinical diagnosis of acute ischemia and drop foot on the left was made. CT-angiography justified linear cement leakage in the course of the left third lumbar vein and fifth lumbar artery, and to the ipsilateral common iliac artery. The patient was treated with low molecular heparin and the ischemia resolved without further sequelae 1 week postoperatively.

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Surgical treatment of Scheuermann's kyphosis using a combined antero-posterior strategy and pedicle screw constructs: efficacy, radiographic and clinical outcomes in 111 cases.

Eur Spine J. 2013 Jul 27;

Authors: Koller H, Juliane Z, Umstaetter M, Meier O, Schmidt R, Hitzl W

Abstract
INTRODUCTION: There is sparse literature on how best to correct Scheuermann's kyphosis (SK). The efficacy of a combined strategy with anterior release and posterior fusion (AR/PSF) with regard to correction rate and outcome is yet to be determined.
MATERIALS AND METHODS: A review of a consecutive series of SK patients treated with AR/PSF using pedicle screw-rod systems was performed. Assessment of demographics, complications, surgical parameters and radiographs including flexibility and correction measures, proximal junctional kyphosis angle (JKA + 1) and spino-pelvic parameters was performed, focusing on the impact of curve flexibility on correction and clinical outcomes.
RESULTS: 111 patients were eligible with a mean age of 23 years, follow-up of 24 months and an average of eight levels fused. Cobb angle at fusion level was 68° preoperatively and 37° postoperatively. Flexibility on traction films was 34 % and correction rate 47 %. Postoperative and follow-up Cobb angles were highly correlated with preoperative bending films (r = 0.7, p < 0.05). Screw density rate was 87 %, with increased correction with higher screw density

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Disc degeneration-related clinical phenotypes.

Eur Spine J. 2013 Jul 25;

Authors: Battié MC, Lazáry A, Fairbank J, Eisenstein S, Heywood C, Brayda-Bruno M, Varga PP, McCall I

Abstract

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The effectiveness of scoliosis screening programs: methods for systematic review and expert panel recommendations formulation.

Scoliosis. 2013 Jul 24;8(1):12

Authors: Beauséjour M, Goulet L, Parent S, Feldman DE, Turgeon I, Roy-Beaudry M, Sosa JF, Labelle H

Abstract
BACKGROUND: Literature on scoliosis screening is vast, however because of the observational nature of available data and methodological flaws, data interpretation is often complex, leading to incomplete and sometimes, somewhat misleading conclusions. The need to propose a set of methods for critical appraisal of the literature about scoliosis screening, a comprehensive summary and rating of the available evidence appeared essential.

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Answer to the Letter to the Editor of J.M. Duart Clemente et al. concerning "multilevel oblique corpectomy for cervical spondylotic myelopathy preserves segmental motion" by AG Chacko, M Joseph, MK Turel, K Prabhu, RT Daniel, KS Jacob (2012) Eur Spine J. 2012;21(7):1360-1367.

Eur Spine J. 2013 Jul 24;

Authors: Chacko AG, Joseph M, Turel MK, Prabhu K, Daniel RT, Jacob KS

PMID: 23880869 [PubMed - as supplied by publisher]

Read more... http://www.ncbi.nlm.nih.gov/pubmed/23880869?dopt=Abstract

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Biomechanical comparison of vertebral augmentation with silicone and PMMA cement and two filling grades.

Eur Spine J. 2013 Jul 24;

Authors: Schulte TL, Keiler A, Riechelmann F, Lange T, Schmoelz W

Abstract
PURPOSE: Vertebral augmentation with PMMA is a widely applied treatment of vertebral osteoporotic compression fractures. Subsequent fractures are a common complication, possibly due to the relatively high stiffness of PMMA in comparison with bone. Silicone as an augmentation material has biomechanical properties closer to those of bone and might, therefore, be an alternative. The study aimed to investigate the biomechanical differences, especially stiffness, of vertebral bodies with two augmentation materials and two filling grades.
METHODS: Forty intact human osteoporotic vertebrae (T10-L5) were studied. Wedge fractures were produced in a standardized manner. For treatment, PMMA and silicone at two filling grades (16 and 35 % vertebral body fill) were assigned to four groups. Each specimen received 5,000 load cycles with a high load range of 20-65 % of fracture force, and stiffness was measured. Additional low-load stiffness measurements (100-500 N) were performed for intact and augmented vertebrae and after cyclic loading.

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"Letter to the Editor" concerning the article: Adolescent idiopathic scoliosis treated with posteromedial translation: radiologic evaluation with a 3D low-dose system. Ilharreborde B, Sebag G, Skalli W, Mazda K (2013) Eur Spine J. Apr 12. 10.1007/s00586-013-2910-6.

Eur Spine J. 2013 Jul 24;

Authors: Berg I, Schouman T

PMID: 23880867 [PubMed - as supplied by publisher]

Read more... http://www.ncbi.nlm.nih.gov/pubmed/23880867?dopt=Abstract