Acesso anterior para pacientes com fraturas traumáticas do tipo compressão do segmento toracolombar (T11 a L2) da coluna vertebral Anterior approach in patients with traumatic compression fracture type of thoracolumbar spine (T11-L2)

OBJETIVO: Relatar a experiência com o acesso anterior em fraturas traumáticas do tipo compressão no segmento toracolombar (T11 a L2) que foram submetidos à cirurgia pelo acesso anterior. MÉTODO: Estudo prospectivo de janeiro de 1994 a janeiro de 2004 envolvendo 32 pacientes. A presença da fusão óssea e do alinhamento foram analisadas 6 e 12 meses após a cirurgia. RESULTADOS: A idade média foi 36,53 anos, sendo 23 do sexo masculino. A vértebra mais atingida foi L1 (n=12). A maioria dos casos que internaram em ASIA/IMSOP C (n=10) e D (n=13) evoluiram para ASIA/IMSOP E. A média da deformidade angular pré-operatória foi 14,9&deg;&plusmn;7,5&deg;, com diferença estatística (p<0,0001) na comparação com o valor encontrado no pós-operatório de 30 dias. CONCLUSÃO: A via anterior permite melhor descompressão do canal e uma correção da deformidade angular superior à observada pela via posterior isolada.<br>OBJECTIVE: To describe experience with anterior access in compression fractures of thoracolumbar segment (T11 to L2) traumatic fractures that undergone anterior access surgery. METHOD: A prospective study was conducted between January 1994 and January 2004 with 32 patients. The bone fusion and thoracolumbar alignment were analyzed 6 months and 12 months after the surgery. RESULTS:The average age was 36.53 years old with 23 male patients. The most compromised vertebrae was L1 (n=12). The 23 patients that was ASIA/IMSOP C and ASIA/IMSOP D turned to ASIA/IMSOP E after 1 month (n=12) and 12 months (n=5) of surgery. The preoperative angular deformity average was 14.9&deg;&plusmn;7.5&deg;. Statistical significance was found (p<0.0001) when compared to the 30 days postoperative value. CONCLUSION: The anterior access permits a better spinal canal decompression and angular deformity correction when compared with the posterior access alone

Precision measurement of the structure of the CMS inner tracking system using nuclear interactions

The structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2015 at the LHC are used to reconstruct millions of secondary vertices from these nuclear interactions. Precise positions of the beam pipe and the inner tracking system elements, such as the pixel detector support tube, and barrel pixel detector inner shield and support rails, are determined using these vertices. These measurements are important for detector simulations, detector upgrades, and to identify any changes in the positions of inactive elements

Precision measurement of the structure of the CMS inner tracking system using nuclear interactions

The structure of the CMS inner tracking system has been studied using nuclear interactions of hadrons striking its material. Data from proton-proton collisions at a center-of-mass energy of 13 TeV recorded in 2015 at the LHC are used to reconstruct millions of secondary vertices from these nuclear interactions. Precise positions of the beam pipe and the inner tracking system elements, such as the pixel detector support tube, and barrel pixel detector inner shield and support rails, are determined using these vertices. These measurements are important for detector simulations, detector upgrades, and to identify any changes in the positions of inactive elements