Browsing by Author "White, Kevin"
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Item Accuracy and reliability of the AO Spine subaxial cervical spine classifcation system grading subaxial cervical facet injury morphology(2021) Cabrera, Juan; Yurac, Ratko; Guiroy, Alfredo; Joaquim, Andrei; Carazzo, Charles; Zamorano, Juan; White, Kevin; Valacco, Marcelo; The AO Spine Latin America Trauma Study GroupPurpose: A classification system was recently developed by the international association AO Spine for assessing subaxial cervical spine fractures. Significant variability exists between users of the facet component, which consists of four morphological types (F1-F4). The primary aims of this study were to assess the diagnostic accuracy and reliability of this new system's facet injury morphological classifications. Methods: A survey consisting of 16 computed tomography (CT) scans of patients with cervical facet fractures was distributed to spine surgeon members of AO Spine Latin America. To provide a gold standard diagnosis for comparison, all 16 injuries had been classified previously by six co-authors and only were included after total consensus was achieved. Demographic and surgical practice characteristics of all respondents were analyzed, and diagnostic accuracy calculated. Inter- and intra-observer agreement rates were calculated across two survey rounds, conducted one month apart. Results: A total of 135 surgeons completed both surveys, among whom the mean age was 41.6 years (range 26-71), 130 (96.3%) were men, and 83 (61.5%) were orthopedic surgeons. The mean time in practice as a spine surgeon was 9.7 years (1-30). The overall diagnostic accuracy of all responses was 65.4%. Inter-observer and intra-observer agreement rates for F1/F2/F3/F4 were 55.4%/47.6%/64.0%/94.7% and 60.0%/49.1%/58.0%/93.0%, respectively. Conclusion: This study evaluates the AO Spine Classification System specifically for facet injuries involving the subaxial cervical spine in a large sample of spine surgeons. There was significant variability in diagnostic accuracy for F1 through F3-type fractures, whereas almost universal agreement was achieved for F4-type injuries.Publication Conventional Radiotherapy Timing and Wound Complication Avoidance After Surgery for Metastatic Spine Disease. A LatAm Modified Delphi Study(2025) Landriel, Federico; White, Kevin; Padilla Lichtenberger, Fernando; Guiroy, Alfredo; Teles, Alisson; Laos Plasier, Eduardo; Buzetti Milano, Jerônimo; Risso, Marcelo; Astur, Nelson; González, Oscar; Yurac, Ratko; Páez, Rodolfo; Teixeira, William; Toscano, Maximiliano; Hem, SantiagoBackground Combining surgery and radiotherapy is the gold standard in treating spinal metastasis when spinal stabilization or surgical decompression is required. Determining the optimal timing for radiotherapy postsurgery is crucial to balance treatment efficacy minimizing wound complications. The study aimed to identify consensus and nonconsensus areas among Latin American spinal surgeons regarding the use, timing, risks, and surgical approach to conventional external beam radiotherapy (cEBRT) following spinal surgery for metastases, specifically focusing on the risk of radiotherapy-related wound complications. Methods A modified Delphi survey was conducted. The expert panel included active members of AOSpine Latin America with extensive experience in vertebral metastasis surgery. The surveys include 37 statements covering areas of interest. Inter-expert consensus was considered weak (70-79.9%), moderate (80-89.9%), and strong (≥90%). Results At least 70% consensus was reached on 32 of the 37 statements (86.5%). This included strong consensus on 10 statements, moderate on 13, and weaker on nine. There was high consensus on sutures and lower consensus on risk factors for cEBRT delay. Experts reached strong agreement on the importance of poor nutrition as a risk factor for cEBRT-related wound complications. Perception of wound risk was greater with a posterior midline approach compared to other approaches, and the highest perceived complication risks were for junctional locations and sacral spine. Conclusions We report strong agreements among the experts on important issues such as waiting times and risk factors for cEBRT. The findings underscore the significance of considering factors such as, spinal levels, surgical approaches, and sutures when making clinical decisions.Item Time to Surgery for Unstable Thoracolumbar Fractures in Latin America—A Multicentric Study(2021) Guiroy, Alfredo; Carazzo, Charles; Zamorano, Juan; Cabrera, Juan; Joaquim, Andrei; Guasque, Joana; Sfredo, Ericson; White, Kevin; Yurac, Ratko; Falavigna, AsdrubalObjective We sought to identify delays for surgery to stabilize unstable thoracolumbar fractures and the main reasons for them across Latin America. Methods We reviewed the charts of 547 patients with type B or C thoracolumbar fractures from 21 spine centers across 9 Latin American countries. Data were collected on demographics, mechanism of trauma, time between hospital arrival and surgery, type of hospital (public vs. private), fracture classification, spinal level of injury, neurologic status (American Spinal Injury Association impairment scale), number of levels instrumented, and reason for delay between hospital arrival and surgical treatment. Results The sample included 403 men (73.6%) and 144 women (26.3%), with a mean age of 40.6 years. The main mechanism of trauma was falls (44.4%), followed by car accidents (24.5%). The most frequent pattern of injury was B2 injuries (46.6%), and the most affected level was T12-L1 (42.2%). Neurologic status at admission was 60.5% intact and 22.9% American Spinal Injury Association impairment scale A. The time from admission to surgery was >72 hours in over half the patients and over a week in >25% of them. The most commonly reported reasons for surgical delay were clinical instability (22.9%), lack of operating room availability (22.7%), and lack of hardware for spinal instrumentation (e.g., screws/rods) (18.8%). Conclusions Timing for surgery in this sample of unstable fractures was over 72 hours in more than half of the sample and longer than a week in about a quarter. The main reasons for this delay were clinical instability and lack of economic resources. There is an apparent need for increased funding for the treatment of spinal trauma patients in Latin America.