Browsing by Author "Figueroa, D"

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    Factores clínicos y hallazgos en la artroscopia de pacientes con artrosis de rodilla que favorecen la conversión a artroplastia total
    (2013) Figueroa, D; Calvo, R; Villalón, I; Tuca, María; Vaisman, A; Valdés, M
    Objetivos: Identificar los hallazgos artroscópicos y las características clínicas de los pacientes con artrosis de rodilla sometidos a lavado articular artroscópico, que se correlacionaron con una mala evolución de su enfermedad y su consecuente conversión a artroplastia total de rodilla (ATR). Método: Estudio retrospectivo-descriptivo de una serie de 78 pacientes (88 rodillas) sometidos a artroscopia de rodilla por artrosis. Cuarenta y cuatro mujeres y 34 varones, con promedio de edad de 58,9 anos ˜ (rango: 37-78) en el momento de la artroscopia, ingresaron al estudio. Tras un seguimiento promedio de 50,4 meses (rango: 12-96) se identificaron aquellos pacientes que evolucionaron a una ATR. Para el análisis estadístico se utilizó un modelo de regresión logística para identificar aquellos elementos asociados a la evolución hacía una ATR. Resultados: En el seguimiento, a 24 rodillas se les implantó una ATR (27,3%) a los 13,5 meses de promedio (rango: 13-29). Las características clínicas de los pacientes que mostraron una asociación estadísticamente significativa hacia una mala evolución fueron: el género femenino (0,02) y clasificación de Ahlbäck 2 (p = 0,04). Los hallazgos artroscópicos asociados significativamente a evolución hacia ATR fueron lesiones meniscales mediales y laterales en cuerno posterior (p = 0,02), cuando se realizó una meniscectomia mayor o igual a un 60% (p = 0,03) y la presencia de lesiones condrales grado 2 en la zona de carga de cóndilo femoral medial (p = 0,01). Conclusión: En este grupo estudiado, las variables asociadas a una mayor posibilidad de terminar en una ATR tras una artroscopia de lavado articular fueron del género femenino, artrosis radiológica grado 2, lesiones meniscales en cuerno posterior, meniscectomia mayor al 60% y lesiones condrales en cóndilo femoral medial grado 2 en zona de carga.
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    Osteochodral lesion mouse model: An alternative for experimental work
    (2015) Martinez, R; Figueroa, D; Calvo, R; Conget, P; Gallegos, M; Figueroa, F; Ahumada, X
    Objective: To report a reproducible and inexpensive model of critical osteochondral lesion (LOC) in adult mice for experimental studies Material and method: An experimental study was conducted on 20 BKS mice of 15 weeks old, in which a LOC of 0.5mm in diameter was made in the trochlear groove. Ten animals were sacrificed at day 7, and the other 10 animals at day 14 of follow up. To assess the ability of the animal to repair/regenerate, a histological analysis was performed using hematoxylin-eosin and safranin-O stains, and the results were evaluated by the ICRS scale using areas of healthy cartilage from the same joint as control. The Mann-Whitney U test was used for the statistical analyses of scores (averages). Results: Significant differences were found in days 7 and 14 between the LOC area and control areas, but no differences were found between the day 7 and day 14. Conclusion: This model of LOC in the trochlear groove of adult mice is highly reproducible, and could be used in further studies to obtain better treatments for chondral pathologies.
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    Patrón de revascularización de injertos de tendones flexores rotos en reconstrucción de ligamento cruzado anterior: un estudio histológico
    (Sociedad Española de cirugia Ortopedica y Traumatologia, 2016) Figueroa, D; Martínez, R; Calvo, R; Scheu, M; Gallegos, M; Vaisman, A; Martínez, C; González, A
    Introduction: For successful anterior cruciate ligament (ACL) reconstruction, revascularisation and histological maturation are necessary, as their failure can cause graft rupture. Purpose: The purpose of this study was to describe differences in the histological maturation of early failed plasty (less than 12 months after surgery) and late failed plasty (more than 12 months after surgery) in patients with re-rupture after ACL reconstruction with hamstring tendons. Material and methods: A descriptive observational study was conducted on a consecutive series of 20 patients whose ACL reconstruction had failed. Graft biopsy samples were obtained during the revision surgery from the proximal, medial, and distal graft remnants. The samples were evaluated by light microscopy, and the vascularity and maturation of the samples were established by histological scoring. Results: The most common aetiology of reconstruction failure (86.6%) was a specific event with non-contact mechanism. The patients with re-rupture of their ACL plasty less than 12 months after surgery had substance vessels that were less deep. The distal segment of the graft in those patients showed a delay in histological maturation with fewer collagen fibres. Conclusion: In patients whose ACL grafts failed less than 12 months after surgery, a lower distribution of blood vessels and collagen fibres was found that were less ordered in the distal graft. These results indicate a delay in maturation, which leads to a higher risk of graft failure.

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