Alaid, Awad

[["dc.bibliographiccitation.firstpage","1819"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Acta Neurochirurgica"],["dc.bibliographiccitation.lastpage","1823"],["dc.bibliographiccitation.volume","157"],["dc.contributor.author","Schatlo, Bawarjan"],["dc.contributor.author","Martinez, Ramon"],["dc.contributor.author","Alaid, Awad"],["dc.contributor.author","von Eckardstein, Kajetan L."],["dc.contributor.author","Akhavan-Sigari, Reza"],["dc.contributor.author","Hahn, Anselm W."],["dc.contributor.author","Stockhammer, Florian"],["dc.contributor.author","Rohde, Veit"],["dc.date.accessioned","2018-11-07T09:51:13Z"],["dc.date.available","2018-11-07T09:51:13Z"],["dc.date.issued","2015"],["dc.description.abstract","Robotic assistance for the placement of pedicle screws has been established as a safe technique. Nonetheless rare instances of screw misplacement have been reported.The aim of the present retrospective study is to assess whether experience and time affect the accuracy of screws placed with the help of the SpineAssist (TM) robot system. Postoperative computed tomography (CT) scans of 258 patients requiring thoracolumbar pedicle screw instrumentation from 2008 to 2013 were reviewed. Overall, 13 surgeons performed the surgeries. A pedicle breach of > 3 mm was graded as a misplacement. Surgeons were dichotomised into an early and experienced period in increments of five surgeries. In 258 surgeries, 1,265 pedicle screws were placed with the aid of the robot system. Overall, 1,217 screws (96.2 %) were graded as acceptable. When displayed by surgeon, the development of percent misplacement rates peaked between 5 and 25 surgeries in 12 of 13 surgeons. The overall misplacement rate in the first five surgeries was 2.4 % (6/245). The misplacement rate rose to 6.3 % between 11 and 15 surgeries (10/158; p = 0.20), and reached a significant peak between 16 and 20 surgeries with a rate of 7.1 % (8/112; p = 0.03). Afterwards, misplacement rates declined. A major peak in screw inaccuracies occurred between cases 10 and 20, and a second, smaller one at about 40 surgeries. One potential explanation could be a transition from decreased supervision (unskilled but aware) to increased confidence of a surgeon (unskilled but unaware) who adopts this new technique prior to mastering it (skilled). We therefore advocate ensuring competent supervision for new surgeons at least during the first 25 procedures of robotic spine surgery to optimise the accuracy of robot-assisted pedicle screws."],["dc.identifier.doi","10.1007/s00701-015-2535-0"],["dc.identifier.isi","000361389600031"],["dc.identifier.pmid","26287268"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35872"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.publisher.place","Wien"],["dc.relation.issn","0942-0940"],["dc.relation.issn","0001-6268"],["dc.title","Unskilled unawareness and the learning curve in robotic spine surgery"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","E13"],["dc.bibliographiccitation.firstpage","E13"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Neurosurgical Focus"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Solomiichuk, Volodymyr"],["dc.contributor.author","Fleischhammer, Julius"],["dc.contributor.author","Molliqaj, Granit"],["dc.contributor.author","Warda, Jwad"],["dc.contributor.author","Alaid, Awad"],["dc.contributor.author","von Eckardstein, Kajetan"],["dc.contributor.author","Schaller, Karl"],["dc.contributor.author","Tessitore, Enrico"],["dc.contributor.author","Rohde, Veit"],["dc.contributor.author","Schatlo, Bawarjan"],["dc.date.accessioned","2020-12-10T18:44:04Z"],["dc.date.available","2020-12-10T18:44:04Z"],["dc.date.issued","2017"],["dc.description.abstract","OBJECTIVE Robot-guided pedicle screw placement is an established technique for the placement of pedicle screws. However, most studies have focused on degenerative disease. In this paper, the authors focus on metastatic spinal disease, which is associated with osteolysis. The associated lack of dense bone may potentially affect the automatic recognition accuracy of radiography-based surgical assistance systems. The aim of the present study is to compare the accuracy of the SpineAssist robot system with conventional fluoroscopy-guided pedicle screw placement for thoracolumbar metastatic spinal disease. METHODS Seventy patients with metastatic spinal disease who required instrumentation were included in this retrospective matched-cohort study. All 70 patients underwent surgery performed by the same team of experienced surgeons. The decision to use robot-assisted or fluoroscopy-guided pedicle screw placement was based the availability of the robot system. In patients who underwent surgery with robot guidance, pedicle screws were inserted after preoperative planning and intraoperative fluoroscopic matching. In the \"conventional\" group, anatomical landmarks and anteroposterior and lateral fluoroscopy guided placement of the pedicle screws. The primary outcome measure was the accuracy of screw placement on the Gertzbein-Robbins scale. Grades A and B (<2-mm pedicle breach) were considered clinically acceptable, and all other grades indicated misplacement. Secondary outcome measures included an intergroup comparison of direction of screw misplacement, surgical site infection, and radiation exposure. RESULTS A total of 406 screws were placed at 206 levels. Sixty-one (29.6%) surgically treated levels were in the upper thoracic spine (T1-6), 74 (35.9%) were in the lower thoracic spine, and the remaining 71 (34.4%) were in the lumbosacral region. In the robot-assisted group (Group I; n = 35, 192 screws), trajectories were Grade A or B in 162 (84.4%) of screws. The misplacement rate was 15.6% (30 of 192 screws). In the conventional group (Group II; n = 35, 214 screws), 83.6% (179 of 214) of screw trajectories were acceptable, with a misplacement rate of 16.4% (35 of 214). There was no difference in screw accuracy between the groups (chi-square, 2-tailed Fisher's exact, p = 0.89). One screw misplacement in the fluoroscopy group required a second surgery (0.5%), but no revisions were required in the robot group. There was no difference in surgical site infections between the 2 groups (Group I, 5 patients [14.3%]; Group II, 8 patients [22.9%]) or in the duration of surgery between the 2 groups (Group I, 226.1 +/- 78.8 minutes; Group II, 264.1 +/- 124.3 minutes; p = 0.13). There was also no difference in radiation time between the groups (Group I, 138.2 +/- 73.0 seconds; Group II, 126.5 +/- 95.6 seconds; p = 0.61), but the radiation intensity was higher in the robot group (Group I, 2.8 +/- 0.2 mAs; Group II, 2.0 +/- 0.6 mAs; p < 0.01). CONCLUSIONS Pedicle screw placement for metastatic disease in the thoracolumbar spine can be performed effectively and safely using robot-guided assistance. Based on this retrospective analysis, accuracy, radiation time, and post-operative infection rates are comparable to those of the conventional technique."],["dc.identifier.doi","10.3171/2017.3.FOCUS1710"],["dc.identifier.eissn","1092-0684"],["dc.identifier.isi","000400609800017"],["dc.identifier.pmid","28463620"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78315"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Amer Assoc Neurological Surgeons"],["dc.relation.issn","1092-0684"],["dc.title","Robotic versus fluoroscopy-guided pedicle screw insertion for metastatic spinal disease: a matched-cohort comparison"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","489"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Neurosurgical Review"],["dc.bibliographiccitation.lastpage","496"],["dc.bibliographiccitation.volume","41"],["dc.contributor.author","Alaid, Awad"],["dc.contributor.author","von Eckardstein, Kajetan"],["dc.contributor.author","Smoll, Nicolas Roydon"],["dc.contributor.author","Solomiichuk, Volodymyr"],["dc.contributor.author","Rohde, Veit"],["dc.contributor.author","Martinez, Ramon"],["dc.contributor.author","Schatlo, Bawarjan"],["dc.date.accessioned","2020-12-10T14:11:12Z"],["dc.date.available","2020-12-10T14:11:12Z"],["dc.date.issued","2017"],["dc.identifier.doi","10.1007/s10143-017-0877-1"],["dc.identifier.eissn","1437-2320"],["dc.identifier.issn","0344-5607"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/70997"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Robot guidance for percutaneous minimally invasive placement of pedicle screws for pyogenic spondylodiscitis is associated with lower rates of wound breakdown compared to conventional fluoroscopy-guided instrumentation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","E14"],["dc.bibliographiccitation.firstpage","E14"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Neurosurgical Focus"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Molliqaj, Granit"],["dc.contributor.author","Schatlo, Bawarjan"],["dc.contributor.author","Alaid, Awad"],["dc.contributor.author","Solomiichuk, Volodymyr"],["dc.contributor.author","Rohde, Veit"],["dc.contributor.author","Schaller, Karl"],["dc.contributor.author","Tessitore, Enrico"],["dc.date.accessioned","2020-12-10T18:44:04Z"],["dc.date.available","2020-12-10T18:44:04Z"],["dc.date.issued","2017"],["dc.description.abstract","OBJECTIVE The quest to improve the safety and accuracy and decrease the invasiveness of pedicle screw placement in spine surgery has led to a markedly increased interest in robotic technology. The SpineAssist from Mazor is one of the most widely distributed robotic systems. The aim of this study was to compare the accuracy of robot-guided and conventional freehand fluoroscopy-guided pedicle screw placement in thoracolumbar surgery. METHODS This study is a retrospective series of 169 patients (83 women [49%]) who underwent placement of pedicle screw instrumentation from 2007 to 2015 in 2 reference centers. Pathological entities included degenerative disorders, tumors, and traumatic cases. In the robot-assisted cohort (98 patients, 439 screws), pedicle screws were inserted with robotic assistance. In the freehand fluoroscopy-guided cohort (71 patients, 441 screws), screws were inserted using anatomical landmarks and lateral fluoroscopic guidance. Patients treated before 2009 were included in the fluoroscopy cohort, whereas those treated since mid-2009 (when the robot was acquired) were included in the robot cohort. Since then, the decision to operate using robotic assistance or conventional freehand technique has been based on surgeon preference and logistics. The accuracy of screw placement was assessed based on the Gertzbein-Robbins scale by a neuroradiologist blinded to treatment group. The radiological slice with the largest visible deviation from the pedicle was chosen for grading. A pedicle breach of 2 mm or less was deemed acceptable (Grades A and B) while deviations greater than 2 mm (Grades C, D, and E) were classified as misplacements. RESULTS In the robot-assisted cohort, a perfect trajectory (Grade A) was observed for 366 screws (83.4%). The remaining screws were Grades B (n = 44 [10%]), C (n = 15 [3.4%]), D (n = 8 [1.8%]), and E (n = 6 [1.4%]). In the fluoroscopy-guided group, a completely intrapedicular course graded as A was found in 76% (n = 335). The remaining screws were Grades B (n = 57 [12.9%]), C (n = 29 [6.6%]), D (n = 12 [2.7%]), and E (n = 8 [1.8%]). The proportion of non-misplaced screws (corresponding to Gertzbein-Robbins Grades A and B) was higher in the robot-assisted group (93.4%) than the freehand fluoroscopy group (88.9%) (p = 0.005). CONCLUSIONS The authors' retrospective case review found that robot-guided pedicle screw placement is a safe, useful, and potentially more accurate alternative to the conventional freehand technique for the placement of thoracolumbar spinal instrumentation."],["dc.identifier.doi","10.3171/2017.3.FOCUS179"],["dc.identifier.eissn","1092-0684"],["dc.identifier.isi","000400609800019"],["dc.identifier.pmid","28463623"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78316"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Amer Assoc Neurological Surgeons"],["dc.relation.issn","1092-0684"],["dc.title","Accuracy of robot-guided versus freehand fluoroscopy-assisted pedicle screw insertion in thoracolumbar spinal surgery"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","549"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","British Journal of Neurosurgery"],["dc.bibliographiccitation.lastpage","551"],["dc.bibliographiccitation.volume","29"],["dc.contributor.author","Zafar, Noman"],["dc.contributor.author","Alaid, Awad"],["dc.contributor.author","Rohde, Veit"],["dc.contributor.author","Mielke, Dorothee"],["dc.date.accessioned","2018-11-07T10:02:57Z"],["dc.date.available","2018-11-07T10:02:57Z"],["dc.date.issued","2015"],["dc.description.abstract","Objective. Virchow-Robin spaces (VRSs) are extensions of subarachnoid spaces that accompany vessels entering the brain. T2-weighted magnetic resonance imaging detects VRS in about 95 percent of patients in a recent study. VRSs are considered a normal variant with benign prognosis. 1 Occasionally, VRS might become symptomatic causing neurological deficits depending on their location. 2 Case description. We report the case of a 55-year-old female patient with dilated VRS presenting with visual field disturbances and cognitive deficits. The patient underwent endoscopic fenestration of a large periventricular VRS located next to the visual radiation into the posterior horn of the right lateral ventricle. During the postoperative course, visual field disturbances were resolved but cognitive deficits remained unchanged. Conclusion. Dilated VRSs can cause a variety of neurological deficits depending on their size and location. Therefore, patients harboring dilated VRS should undergo early close inspection and in case of progressive neurological deficits, an operative therapy should be done; as valve mechanisms can cause a reduction of size when brain scans are conducted and later lead to occurrence of severe neurological deficits during phase of dilation."],["dc.identifier.doi","10.3109/02688697.2015.1019417"],["dc.identifier.isi","000361306900014"],["dc.identifier.pmid","25822094"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38339"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Taylor & Francis Ltd"],["dc.relation.issn","1360-046X"],["dc.relation.issn","0268-8697"],["dc.title","Intermittent visual field defects caused by a dilated Virchow-Robin space close to the optic radiation: Therapeutic and pathomechanical considerations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]