Browsing by Author "Palma, J."

Now showing 1 - 7 of 7
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    An Independent Interobserver Reliability and Intraobserver Reproducibility Evaluation of the New AOSpine Thoracolumbar Spine Injury Classification System
    (2015) Urrutia Escobar, Julio Octavio; Zamora Helo, Tomás; Yurac, R.; Campos Daziano, Mauricio Andrés; Palma, J.; Mobarec Katunaric, Sebastián Ignacio; Prada, C.
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    Do thoraco-lumbar spinal injuries classification systems exhibit lower inter- and intra-observer agreement than other fractures classifications?: A comparison using fractures of the trochanteric area of the proximal femur as contrast model
    (2016) Urrutia Escobar, Julio Octavio; Zamora, T.; Klaber Rosenberg, Ianiv; Carmona, M.; Palma, J.; Campos, M.; Yurac, R.
    Introduction It has been postulated that the complex patterns of spinal injuries have prevented adequate agreement using thoraco-lumbar spinal injuries (TLSI) classifications; however, limb fracture classifications have also shown variable agreements. This study compared agreement using two TLSI classifications with agreement using two classifications of fractures of the trochanteric area of the proximal femur (FTAPF). Material and methods Six evaluators classified the radiographs and computed tomography scans of 70 patients with acute TLSI using the Denis and the new AO Spine thoraco-lumbar injury classifications. Additionally, six evaluators classified the radiographs of 70 patients with FTAPF using the Tronzo and the AO schemes. Six weeks later, all cases were presented in a random sequence for repeat assessment. The Kappa coefficient (κ) was used to determine agreement. Results Inter-observer agreement: For TLSI, using the AOSpine classification, the mean κ was 0.62 (0.57–0.66) considering fracture types, and 0.55 (0.52–0.57) considering sub-types; using the Denis classification, κ was 0.62 (0.59–0.65). For FTAPF, with the AO scheme, the mean κ was 0.58 (0.54–0.63) considering fracture types and 0.31 (0.28–0.33) considering sub-types; for the Tronzo classification, κ was 0.54 (0.50–0.57). Intra-observer agreement: For TLSI, using the AOSpine scheme, the mean κ was 0.77 (0.72–0.83) considering fracture types, and 0.71 (0.67–0.76) considering sub-types; for the Denis classification, κ was 0.76 (0.71–0.81). For FTAPF, with the AO scheme, the mean κ was 0.75 (0.69–0.81) considering fracture types and 0.45 (0.39–0.51) considering sub-types; for the Tronzo classification, κ was 0.64 (0.58–0.70). Conclusion Using the main types of AO classifications, inter- and intra-observer agreement of TLSI were comparable to agreement evaluating FTAPF; including sub-types, inter- and intra-observer agreement evaluating TLSI were significantly better than assessing FTAPF. Inter- and intra-observer agreements using the Denis classification were also significantly better than agreement using the Tronzo scheme. Introduction It has been postulated that the complex patterns of spinal injuries have prevented adequate agreement using thoraco-lumbar spinal injuries (TLSI) classifications; however, limb fracture classifications have also shown variable agreements. This study compared agreement using two TLSI classifications with agreement using two classifications of fractures of the trochanteric area of the proximal femur (FTAPF). Material and methods Six evaluators classified the radiographs and computed tomography scans of 70 patients with acute TLSI using the Denis and the new AO Spine thoraco-lumbar injury classifications. Additionally, six evaluators classified the radiographs of 70 patients with FTAPF using the Tronzo and the AO schemes. Six weeks later, all cases were presented in a random sequence for repeat assessment. The Kappa coefficient (κ) was used to determine agreement. Results Inter-observer agreement: For TLSI, using the AOSpine classification, the mean κ was 0.62 (0.57–0.66) considering fracture types, and 0.55 (0.52–0.57) considering sub-types; using the Denis classification, κ was 0.62 (0.59–0.65). For FTAPF, with the AO scheme, the mean κ was 0.58 (0.54–0.63) considering fracture types and 0.31 (0.28–0.33) considering sub-types; for the Tronzo classification, κ was 0.54 (0.50–0.57). Intra-observer agreement: For TLSI, using the AOSpine scheme, the mean κ was 0.77 (0.72–0.83) considering fracture types, and 0.71 (0.67–0.76) considering sub-types; for the Denis classification, κ was 0.76 (0.71–0.81). For FTAPF, with the AO scheme, the mean κ was 0.75 (0.69–0.81) considering fracture types and 0.45 (0.39–0.51) considering sub-types; for the Tronzo classification, κ was 0.64 (0.58–0.70). Conclusion Using the main types of AO classifications, inter- and intra-observer agreement of TLSI were comparable to agreement evaluating FTAPF; including sub-types, inter- and intra-observer agreement evaluating TLSI were significantly better than assessing FTAPF. Inter- and intra-observer agreements using the Denis classification were also significantly better than agreement using the Tronzo scheme.
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    Effect of Propionibacterium acnes (PA) injection on intervertebral disc degeneration in a rat model : does it mimic modic changes?
    (2017) Zamora Helo, Tomás; Palma, J.; Andía Kohnenkampf, Marcelo Edgardo; García Cañete, Patricia; Wozniak Banchero, Aniela; Solar González, Antonieta Alejandra; Campos, M.
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    Effet de l’injection de Propionibacterium acnes (PA) sur la dégénérescence dans un modèle de rat
    (2017) Zamora Helo, Tomás; Palma, J.; Andía Kohnenkampf, Marcelo Edgardo; García Cañete, Patricia; Wozniak Banchero, Aniela; Solar González, Antonieta Alejandra; Campos, M.
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    "Evaluation of the geotechnical behavior of Chilean volcanic soils as filter material for domestic water treatment"
    (PONTIFICIA UNIV CATOLICA CHILE, ESCUELA CONSTRUCCION CIVIL, 2011) Sanhueza, C.; Palma, J.; Valenzuela, P.; Araneda, O.; Calderon, K.
    Investigations carried out at Chile have determined that certain soils placed over the years as a product of the volcanic activity can be suitable for use as filter material in domestic wastewater purification. These soils have been studied by Universidad de Chile researchers, who have defined the main characteristics of the most important Chilean volcanic soils and, according to the properties studied (such as porosity, surface area and density, among others) have alleged that these materials exhibit water filter behaviour. As results of this research, first of all, the existing geotechnical information on Chilean volcanic soils has been complemented, such as hydraulic conductivity and, has been evaluating the influence design parameters, such as thickness of volcanic soil layers and the application rate of wastewater, in the purification of domestic wastewater.
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    Nueva alternativa para el control de compactación de tranques de relave : penetrómetro PANDA
    (2007) Espinace Abarzúa, Raúl; Palma, J.; Peña, A.; Villavicencio, G.; Bossier, D.; Bacconnet, C.; Gourves, R.
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