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Farshad-Amacker N.A.,MRI | Lurie B.,MRI | Herzog R.J.,Spinal USA | Farshad M.,Spine Surgery
European Radiology | Year: 2014

Objective: Sufficiently sized studies to determine the value of the iliolumbar ligament (ILL) as an identifier of the L5 vertebra in cases of a lumbosacral transitional vertebra (LSTV) are lacking.Methods: Seventy-one of 770 patients with LSTV (case group) and 62 of 611 subjects without LSTV with confirmed L5 level were included. Two independent radiologists using coronal MR images documented the level(s) of origin of the ILL. The interobserver agreement was analysed using weighted kappa/kappa (wκ/κ) and a Fischer’s exact test to assess the value of the ILL as an identifier of the L5 vertebra.Results: The ILL identified the L5 vertebra by originating solely from L5 in 95 % of the controls; additional origins were observed in 5 %. In the case group, the ILL was able to identify the L5 vertebra by originating solely from L5 in 25–38 %. Partial origin from L5, including origins from other vertebra was observed in 39–59 % and no origin from L5 at all in 15–23 % (wκ = 0.69). Both readers agreed that an ILL was always present and its origin always involved the last lumbar vertebra.Conclusion: The level of the origin of the ILL is unreliable for identification of the L5 vertebra in the setting of an LSTV or segmentation anomalies. © 2014, European Society of Radiology. Source


Haufe S.M.W.,Pain Medicine and Anesthesiology | Mork A.R.,Spine Surgery
International Journal of Medical Sciences | Year: 2010

Study design: Retrospective, observational, open label. Objective: We investigated the efficacy of facet debridement for the treatment of facet joint pain. Summary of background data: Facet joint disease, often due to degenerative arthritis, is common cause of chronic back pain. In patients that don't respond to conservative measures, nerve ablation may provide significant improvement. Due to the ability of peripheral nerves to regenerate, ablative techniques of the dorsal nerve roots often provide only temporary relief. In theory, ablation of the nerve end plates in the facet joint capsule should prevent reinnervation. Methods: All patients treated with endoscopic facet debridement at our clinic from 2003-2007 with at least 3 years follow-up were included in the analysis. Primary outcome measure was percent change in facet-related pain as measured by Visual Analog Scale (VAS) score at final follow-up visit. Results: A total of 174 people (77 women, 97 men; mean age 64, range 22-89) were included. Location of facet pain was cervical in 45, thoracic in 15, and lumbar in 114 patients. At final follow-up, 77%, 73%, and 68% of patients with cervical, thoracic, or lumbar disease, respectively, showed at least 50% improvement in pain. Mean operating time per joint was 17 minutes (range, 10-42). Mean blood loss was 40 ml (range, 10-100). Complications included suture failure in two patients, requiring reclosure of the incision. No infection or nerve damage beyond what was intended occurred. Conclusions: Our results demonstrate a comparable efficacy of endoscopic facet debridement compared to radiofrequency ablation of the dorsal nerve branch, with durable results. Large scale, randomized trials are warranted to further evaluate the relative efficacy of this surgical treatment in patients with facet joint disease. © Ivyspring International Publisher. Source


Manfrini M.,University of Ferrara | Di Bona C.,University of Ferrara | Canella A.,University of Ferrara | Lucarelli E.,Rizzoli Orthopaedic Institute | And 4 more authors.
Journal of Cellular Physiology | Year: 2013

Bio-engineered scaffolds used in orthopedic clinical applications induce different tissue responses after implantation. In this study, non-stoichiometric Mg2+ ions and stoichiometric apatites, which are used in orthopedic surgery as bone substitutes, have been assayed in vitro with human adult mesenchymal stem cells (hMSC) to evaluate cytocompatibility and osteoconductivity. hMSCs from the bone marrow aspirates of orthopedic patients were isolated and analyzed by flow cytometry for the surface markers Stro1, CD29, CD44, CD71, CD73, CD90, CD105 (positive) and CD45, CD235 (negative). The hMSC were analyzed for self-renewal capacity and for differentiation potential. The hMSC, which were grown on different biomaterials, were analyzed for (i) cytotoxicity by AlamarBlue metabolic assay, (ii) osteoconductivity by ELISA for activated focal adhesion kinase, (iii) cytoskeleton organization by fluorescence microscopy, and (iv) cell morphology which was investigated by scan electron microscopy (SEM). Results indicate that isolated cell populations agree with minimal criteria for defining hMSC cultures. Non-stoichiometric Mg2+ and stoichiometric apatites, in granular form, represent a more favorable environment for mesenchymal stem cell adhesion and growth compared to the non-stoichiometric Mg2+ apatite, in nano-structured paste form. This study indicates that different forms of biomaterials modulate osteoconductivity and cellular growth by differential activation focal adhesion kinase. © 2012 Wiley Periodicals, Inc. Source


Roder C.,University of Bern | Boszczyk B.,University of Nottingham | Perler G.,University of Bern | Aghayev E.,University of Bern | And 2 more authors.
European Spine Journal | Year: 2013

Purpose: The effectiveness of vertebral augmentation techniques is a currently highly debated issue. The biomechanical literature suggests that cement filling volumes may play an important role in the "dosage" of vertebral augmentation and its pain alleviating effect. Good clinical data about filling volumes are scarce and most patient series are small. Therefore, we investigated the predictors of pain alleviation after balloon kyphoplasty in the nationwide SWISSspine registry where cement volumes are also recorded. Methods: All single-level vertebral fractures with no additional fracture stabilization and availability of at least one follow-up within 6 months after surgery were included. The following potential predictors were assessed in a multivariate logistic regression model with the group's average pain alleviation of 41 points on VAS as the desired outcome: patient age, patient sex, diagnosis, preoperative pain, level of fracture, type of fracture, age of fracture, segmental kyphotic deformity, cement volume, vertebral body filling volume, and cement extrusions. Results: There were 194 female and 82 males with an average age of 70.4 and 65.3 years, respectively. Female patients were about twice as likely for achieving the average pain relief compared to males (p = 0.04). The preoperative pain level was the strongest predictor in that the likelihood for achieving an at least 41-point pain relief increased by about 8 % with each additional point of preoperative pain (p < 0.001). A thoraco-lumbar fracture had a three times higher odds for the average pain relief compared with a lumbar fracture (p = 0.03). An A.3.1 fracture only had about a third of the probability for average pain relief compared with an A.1.1 fracture (p = 0.004). Cement volumes up to 4.5 ml only had an approximately 40 % chance for a minimum 41-point pain alleviation as compared with cement volumes of at least 4.5 ml (p = 0.007). In addition, the relationship between cement volume and pain alleviation followed a dose-dependent pattern. Conclusions: Cement volume was revealed as a significant predictor for pain relief in BKP. Cement volume was the third most important influential covariate and the most important modifiable and operator dependent one. The clear dose-outcome relationship between cement filling volumes and pain relief additionally supports these findings. Cement volumes of >4.5 ml seem to be recommendable for achieving relevant pain alleviation. Patient sex and fracture type and location were further significant predictors and all these covariates should be recorded and reported in future studies about the pain alleviating effectiveness of vertebral augmentation procedures. © 2013 Springer-Verlag Berlin Heidelberg. Source


Farshad-Amacker N.A.,Hospital for Special Surgery | Lurie B.,Hospital for Special Surgery | Herzog R.J.,Hospital for Special Surgery | Farshad M.,Spine Surgery
Spine Journal | Year: 2014

Background context Different types of lumbosacral transitional vertebra (LSTV) are classified based on the relationship of the transverse process of the last lumbar vertebra to the sacrum. The Ferguson view (30° angled anteroposterior [AP] radiograph) is supposed to have a sufficient interreader reliability in classification of LSTV, but is not routinely available. Standard AP radiographs and magnetic resonance imaging (MRI) are often available, but their reliability in detection and classification of LSTV is unknown. Purpose The purpose of this study was to evaluate the interreader reliability of detection and classification of LSTV with standard AP radiographs and report its accuracy by use of intermodality statistics compared with MRI as the gold standard. Study design/setting Retrospective case control study. Patient sample A total of 155 subjects (93 cases: LSTV type 2 or higher; 62 controls). Outcome measures Interreader reliability in detection and classification of LSTV using standard AP radiographs and coronal MRI as well as accuracy of radiographs compared with MRI. Methods After institutional review board approval, coronal MRI scans and conventional AP radiographs of 155 subjects (93 LSTV type 2 or higher and 62 controls) were retrospectively reviewed by two independent, blinded readers and classified according to the Castellvi classification. Interreader reliability was assessed using kappa statistics for detection of an LSTV and identification of all subtypes (six variants; 1: no LSTV or type I, 2: LSTV type 2a, 3: LSTV type 2b, 4: LSTV type 3a, 5: LSTV type 3b, 6: LSTV type 4) for MRI scans and standard AP radiographs. Further, accuracy and positive and negative predictive values were calculated for standard AP radiographs to detect and classify LSTV using MRI as the gold standard. Results The interreader reliability was at most moderate for the detection (k=0.53) and fair for classification (wk=0.39) of LSTV in standard AP radiograph. However, the interreader reliability was very good for detection (k=0.93) and classification (wk=0.83) of LSTV in MRI. The accuracy and positive and negative predictive values of standard AP radiograph were 76% to 84%, 72% to 86%, and 79% to 81% for the detection and 53% to 58%, 51% to 76%, and 49% to 55% for the classification of LSTV, respectively. Conclusion Standard AP radiographs are insufficient to detect or classify LSTV. Coronal MRI scans, however, are highly reliable for classification of LSTV. © 2014 Elsevier Inc. All rights reserved. Source

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