Objective: To evaluate the loss of correction after treatment of spine deformities with the technique of isolated posterior vertebrectomy. Methods: Twenty-one patients were followed-up for three years after surgery with panoramic X-rays, CT scans, SF-36 and Oswestry questionnaires. We evaluated the loss of correction, CAGE subsidence and the evolution of the pelvis-T1 angle during follow-up. The correlation among the radiographic changes and functional and quality of life scores was also assessed. Results: All patients had some degree of loss of correction and subsidence of CAGE, especially in the first year of follow-up. Such losses exerted negative impact on the function, pain and self-image of the patients. Factors such as the stiffness of the fusion mass and size of implant used appear to have contributed to the occurrence of subsidence, regardless of age and bone mineral density. Conclusions: The use of spacers with larger cross-sectional diameter and more rigid rods can reduce the overloading on the anterior column of Denis, reducing the subsidence and loss of correction. Additional stabilization strategies such as the use of orthoses postoperatively can also be useful, and should be evaluated in subsequent studies.
OBJETIVO: O objetivo deste estudo foi avaliar os resultados radiográficos, bem como, as complicações precoces e tardias, da técnica de osteotomia de subtração pedicular (PSO) em pacientes com deformidades sagitais fixas. MÉTODOS: Foram avaliados os prontuários e as radiografias panorâmicas em perfil, realizadas no pré- e pós-operatório, de nove pacientes. Todos foram submetidos à osteotomia ao nível lombar (três ao nível L3 e dois ao nível L2). No grupo estudado, quatro pacientes possuíam o diagnóstico de espondilite anquilosante, três cifose lombar pós-artrodese, um cifoescoliose do adulto e um pseudo-hipoparatireoidismo. Foram avaliados os dados do prontuário como: ruptura da dura-máter, lesão neurológica, infecção e falha da síntese. A avaliação radiológica baseou-se nas incidências em perfil panorâmico ortostático das radiografias pré- e pós-operatórias, com a medição do ângulo de cifose torácica, lordose lombar e eixo sagital. RESULTADOS: Os achados radiográficos mostraram um aumento na lordose lombar de 14,6 ° para 44,7° (30°), enquanto que a cifose torácica permaneceu estável em 48°, redução do desequilíbrio sagital de 13,7 para 5,4mm. O tempo médio de cirurgia foi de 08h10min e sangramento médio de 2.460mL. Um paciente sofreu ruptura da dura-máter (durotomia), dois pacientes apresentaram infecção da ferida operatória, com necessidade de revisões e retirada do material de síntese em apenas um. Nenhum dos pacientes apresentou lesão neurológica. CONCLUSÃO: Embora seja um procedimento tecnicamente exigente, com perda sanguínea, elevado tempo cirúrgico e complicações severas, a osteotomia de subtração pedicular obteve uma significativa melhora na correção do equilíbrio sagital, sendo um recurso valioso para efetiva correção dos desequilíbrios posturais no plano sagital, como observada na espondilite anquilosante e complicações de cirurgias prévias.
Objective: To identify the incidence and possible risk factors associated with rod breakage in patients who underwent vertebral column resection (VCR) or pedicle subtraction osteotomy (PSO) to treat complex deformities of the spine. Methods: Retrospective analysis of a series of 32 patients operated from 2014 to 2018 in a single center. The patients were analyzed for demographic (sex, age), biometric (BMI), radiographical (pre-and postoperative angular variations), and surgical (arthrodesed and osteotomized levels) characteristics. Descriptive analyses were performed for the numerical variables (mean, standard deviation, maximum, median, and minimum) and frequency analysis was performed for the categorical variables. Logistic regression analysis was performed for the dependent variable "rod breakage", using a stepwise technique to select the variables for the best model, assuming statistical significance of 0.05. Results: Of the 32 patients selected, rod breakage occurred in 34.4%. Mean age was 36.6 years (± 19.8), ranging from 10 to 74 years, and the mean BMI was 25.1 (±6.0). Most patients were subjected to VCR (75.0%), were males (56.2%) and did not smoke (90.6%). Logistic regression analysis showed that "arthrodesed levels" were was positively associated with rod breakage (OR 1.72; CI95%: 1.13-3.10; p<0.05). The other factors were not associated with breakage. Conclusion: Rod breakage is a frequent complication after three-column osteotomy, especially in long constructions. Level of evidence III; Retrospective Study.
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