Browsing by Author "Irarrazaval, Sebastian"

Now showing 1 - 8 of 8
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    Anterior and distal tunnel orientation for anatomic reconstruction of the medial patellofemoral ligament is safer in patients with open growth plates
    (SPRINGER, 2020) Irarrazaval, Sebastian; Besa, Pablo; Fernandez, Francisco; Fernandez, Tomas; Tuca, Maria; Lira, Maria J.; Orrego, Mario
    Purpose In patients with open growth plates, the direction of tunneling that avoids distal femoral physis (DFP) damage in anatomic reconstructions of the medial patellofemoral ligament (MPFL) has been a topic of discussion. The objective of this study was to determine the ideal orientation for anatomic reconstructions of MPFL tunneling that minimized DFP damage while avoiding breaching the intercondylar notch. Methods Eighty magnetic resonance images of patients aged 10 through 17 were obtained, randomly sampled from the institutional database. A de novo software was developed to obtain 3D models of the distal femur and DFP. In each model, the anatomical insertion point of the MPFL was determined as defined by Stephen. A 20-mm-depth drilling was simulated, starting from the insertion point at every possible angle within a 90 degrees cone using 5-, 6- and 7-mm drills. Physeal damage for each pair of angles and each drill size was determined. Damage was expressed as a percentage of total physis volume. Statistical analysis was conducted using Student'sttest and one-way ANOVA. Results Maximum physeal damage (5.35% [4.47-6.24]) was obtained with the 7-mm drill when drilling 3 degrees cephalic and 15 degrees posterior from insertion without differences between sexes (n.s.). Minimal physeal damage (0.22% [0.07-0.37]) was obtained using the 5-mm drill aimed 45 degrees distal and 0 degrees anteroposterior, not affected by sex (n.s.). Considering intra-articular drilling avoidance, the safest zone was obtained when aiming 30 degrees-40 degrees distal and 5 degrees-35 degrees anterior, regardless of sex. Conclusion Ideal femoral tunnel orientation, avoiding physeal damage and breaching of the intercondylar notch, was obtained when aiming 30 degrees-40 degrees distal and 5 degrees-35 degrees anterior, regardless of sex. This area is a safe zone that allows anatomic MPFL reconstruction of patients with an open physis.
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    Casas Houses
    (PONTIFICIA UNIV CATOLICA CHILE, ESCUELA ARQUITECTURA, 2010) Irarrazaval, Sebastian
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    Case Report of Frostbite with Delay in Evacuation: Field Use of Iloprost Might Have Improved the Outcome
    (2018) Irarrazaval, Sebastian; Besa, Pablo; Cauchy, Emmanuel; Pandey, Prativa; Vergara Leyton, Jorge
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    CATERPILLAR HOUSE, SANTIAGO, CHILE
    (PONTIFICIA UNIV CATOLICA CHILE, ESCUELA ARQUITECTURA, 2012) Irarrazaval, Sebastian
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    Finite element modeling of multiple density materials of bone specimens for biomechanical behavior evaluation
    (2021) Irarrazaval, Sebastian; Ramos Grez, Jorge; Perez, Luis Ignacio; Besa, Pablo; Ibanez, Angelica
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    MODULAR SCHOOL
    (PONTIFICIA UNIV CATOLICA CHILE, ESCUELA ARQUITECTURA, 2011) Irarrazaval, Sebastian
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    Skyline view of the patella does not increase fracture detection: A non-inferiority diagnostic study
    (2023) Gonzalez, Nicolas; Besa, Pablo; Correa, Ignacio; Guiloff, Benjamin; Irarrazaval, Sebastian
    Purpose: Patella fractures are frequent injuries in the adult population. Initial study is made by plain radiographs and the standard set includes the skyline view of patella. Recommendation for use of this projection is variable among the experts, without data that support its performance in the diagnosis of patella fractures. The main purpose of this study was to determine the sensitivity of the antero-posterior and lateral view of the knee, without skyline view, in the diagnosis of patella fracture.
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    Tibial Cut Accuracy in Mechanically Aligned Total Knee Arthroplasty Using Extensor Hallucis Longus Tendon to Determine Extramedullary Tibial Guide Position
    (2022) Besa, Pablo; Vega, Rafael; Ledermann, Gerardo; Calvo, Claudio; Angulo, Manuela; Lira, Maria Jesus; Vidal, Catalina; Orrego, Mario; Irribarra, Luis; Espinosa, Julio; Vial, Raimundo; Irarrazaval, Sebastian
    This study aimed to determine the tibial cut (TC) accuracy using extensor hallucis longus (EHL) tendon as an anatomical landmark to position the total knee arthroplasty (TKA) extramedullary tibial guide (EMTG), and its impact on the TKA mechanical alignment (MA). We retrospectively studied 96 TKA, performed by a single surgeon, using a femoral tailored intramedullary guide technique. Seventeen were prior to the use of the EHL and 79 used the EHL tendon to position the EMTG. We analyzed preoperative and postoperative standing total lower extremity radiographs to determine the tibial component angle (TCA) and the correction in MA, comparing pre-EHL use and post-EHL technique incorporation. Mean TCA was 88.89 degrees and postoperative MA was neutral in 81% of patients. Pre- and postoperative MAs were not correlated. As a conclusion of this study, using the EHL provides a safe and easy way to determine the position of EMTG.