Repositorio Institucional
Sistema de Bibliotecas Universidad Finis Terrae
El Repositorio Institucional de la Universidad FinisTerrae, es gestionado por el Sistema de Bibliotecas y tiene por objetivo permitir el acceso libre a la producción académica e institucional de la Universidad, aumentando la visibilidad de sus contenidos y garantizando su conservación.
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Comparative study of akin osteotomies with and without fixation in open hallux valgus correction surgery: restrospective analysis of 200 osteotomies
(MPDI, 2026-09-15) Testa, Enrique Adrian; Porreca, Annamaria; Ruiz-Nasarre, Alberto; Alvarez-Goenaga, Fernando; Poggio-Cano, Daniel; Dalmau-Pastor, Miki; Montoya de la Torre, Carolina; Riegger, Martin; Ruiz-Riquelme, Pablo
Background: In hallux valgus correction surgery, different fixation methods exist for Akin’s osteotomy, but no fixation is also a possibility. We hypothesized that Akin’s osteotomy, both fixed and non-fixed, would provide equally sufficient correction of the phalanx without differences in the measurements of the specific postoperative DASA and IPOA angles and no significant differences between the two groups in the rate of complications.
Methods: A retrospective single-center comparative case–control study was conducted. Five radiological measurements were analyzed until completion of fusion. The incidence of complications occurring during and after surgery was assessed and compared across the study groups.
Results: A total of 200 Akin osteotomies were evaluated; 100 were included in the group without fixation and 100 in the group with fixation. Radiologically, the results show that there is no difference in the corrective difference values in the main parameters between the groups. Regarding the analysis of complications, in the group without fixation, all cases achieved fusion. In the group with fixation, one case showed non-symptomatic non-union. Out of 200 operations, four (2%) patients required reoperation. A re-Akin osteotomy was needed for a hypocorrection in the group without fixation. One case in the fixed group went into asymptomatic non-union that did not require re-intervention.
Conclusions: The absence of internal fixation does not seem to compromise the healing of the osteotomy, and the maintenance of correction grades and complication rates in the group without fixation seems to be similar to the group with fixation. The results are promising; however, we believe that further studies are needed to confirm the data.
Catequesis prescriptiva y pensamiento complejo. Un análisis del Directorio para la Catequesis
(Universidad Católica Argentina, 0026-08) Díaz Tejo, Javier
Este artículo analiza la concepción prescriptiva de la catequesis contenida en el Directorio para la Catequesis (2020), interrogando su grado de compatibilidad con una perspectiva de pensamiento complejo. En un contexto marcado por la incertidumbre y aceleración social, el estudio adopta el pensamiento complejo como lente epistémico para examinar el marco normativo que orienta la catequesis en la Iglesia universal. A partir de la identificación de cinco criterios operativos, el artículo aplica un análisis sistemático al Directorio. Los resultados muestran afinidades significativas con una comprensión relacional y procesual de la catequesis, junto con tensiones persistentes en la explicitación epistemológica de algunos rasgos centrales de la complejidad
Thresholds of Self-Organisation in Catholic Religious Education: A Complex Analysis of Curricula in Latin America
(0026-02-02) Díaz Tejo, Javier; Vega Ramírez, Javier
This article analyses the official Catholic Religious Education (CRES) programmes in Chile, Brazil, Costa Rica and Colombia from the perspective of complexity sciences, using the concept of self-organisation as a central analytical axis. Given Latin American contexts marked by religious pluralism, cultural transformation, institutional crisis and youth subjectivities, it is proposed that the adequacy of CRES does not depend solely on content or methodologies, but also on the systemic architecture that articulates students, classrooms and institutions in relation to their environment. Methodologically, the study develops a framework of three thresholds of educational self-organisation—reactive, reflective, and ecological—and applies it comparatively to the four national programmes, examining how they distribute agency, learning capacity, and openness to context at the student, classroom, and school-environment levels. The analysis reveals that, although all programmes activate relevant forms of reactive and reflective self-organisation, only some partially enable thresholds of ecological self-organisation capable of sustainably integrating contemporary sociocultural and religious complexity. The results allow us to identify structural tensions between current curriculum designs and the demands of increasingly complex environments.
From conceptual foundations to enacted PCK: a mixed-methods study with primary teachers teaching the human body
(Routledge, 2026-09-21) Santibáñez, David; Lederman, Judith; Vega, Alejandro; Adsuar, José
Pedagogical Content Knowledge (PCK) represents a core component of teachers' professional knowledge and one of the strongest predictors of effective science instruction. This study examines how teachers' Conceptual Knowledge (CK) relates to both their personal and enacted PCK among 13 in-service primary school teachers teaching the human body. An explanatory sequential mixed-methods design was employed, combining a CK test, an analytic PCK rubric, and pre- and post-lesson interviews supported by classroom video recordings. Results revealed a low correlation between CK and PCK, suggesting that they are distinct yet interrelated constructs. However, a functional conceptual threshold was identified, beyond which teachers were able to enact more coherent and scientifically grounded PCK. The qualitative analysis uncovered different patterns of CK-PCK articulation, ranging from routine-based strategies to reflective practices aimed at promoting students' conceptual understanding. These findings reinforce that PCK develops not only through disciplinary mastery but also through sustained reflection and engagement in authentic teaching contexts. Implications are discussed for both preservice and in-service teacher education, highlighting the importance of integrating content learning with didactic analysis experiences that support the development and enactment of PCK across scientific topics and classroom situations.
teaching contexts. Implications are discussed for both preservice
and in-service teacher education, highlighting the importance of
integrating content learning with didactic analysis experiences
that support the development and enactment of PCK across
scientific topics and classroom situations.
Sustainable mitigation of acrylamide formation during Maillard reaction using grape pomace extracts obtained by green pressurized liquid extraction
(Royal Society of Chemistry, 2026-09-07) Patiño-Arias, Lina Paola; Rajchman, Mikaela; Montero, Lidia; Herrero, Miguel; Mariotti-Celis, María Salomé; Henriquez-Aedo, Karem; Aranda, Mario
Acrylamide (AA) is a food neo-contaminant classified as a probable human carcinogen formed during the Maillard reaction. Natural (poly)phenolic extracts have emerged as promising mitigation strategies to inhibit AA formation. In this study, pressurized liquid extraction (PLE) conditions were optimized to obtain grape pomace extracts with maximum AA mitigation. Temperature (50–180 °C) and ethanol percentage (0–100% v/v) were optimized using a central composite design, finding an optimal response at 180 °C and 21% ethanol, with which AA formation was decreased by 33.36 ± 3.31% in the asparagine–glucose (ASN–GLC) model that emulates the Maillard reaction. This extract (0.1–0.8%) was also assayed in a bread model, reducing AA formation by 41.25 ± 9.36% when used at 0.4% w/w. Epicatechin, gallic acid, and catechin were the predominant (poly)phenols, and their individual effect on AA formation showed reductions from 35.46 ± 1.30% to 42.83 ± 10.94% in the ASN–GLC model. These findings confirm that PLE grape pomace extracts can successfully mitigate AA formation mainly through catechin, epicatechin, and gallic acid.