Browsing by Author "Contreras, Julio"

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    Efectividad de un programa de rehabilitación autoadministrado en el tratamiento del síndrome de hombro doloroso en atención primaria de salud : un estudio clínico aleatorizado, simple ciego
    (2018) Contreras, Julio; Liendo Verdugo, Rodrigo Javier; Díaz, Cristóbal; Díaz, María; Osorio, Matías; Guzmán, Ricardo; Soza Rex, José Francisco; Beltrán, Manuel; Palomo, Héctor; Córdova, Carlos
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    Estimating Glenoid Fossa width for Instability-related Bone loss with CT Scan in a Chilean Sample
    (2021) Contreras, Julio; Ogrodnik, Claus; Khek, Pablo
    Glenoid fossa bone loss has been associated with recurrence and failure after glenoid labrum repair for shoulder instability. Quantification of glenoid fossa bone loss is critical for the successful treatment of glenohumeral instability. The aim of this paper was to estimate a linear regression model based on glenoid height in CT scan adjusted for age and sex to calculate glenoid fossa width in a healthy Chilean sample. CT scans of 101 shoulders were reviewed. The mean age was 51.96 years (SD 19.16; range, 15-88 years) with 53 females and 48 male patients. Studies with signs of bone loss, instability, fracture, or arthritis were excluded. After 3D-CT reconstruction, the height and width of each glenoid fossa was measured using the Owens methodology. All landmarks for the 2 measurements were placed on the most lateral surface of the glenoid fossa margin. Measurements for all shoulders were recorded by 3 observers and repeated on a subset (n = 20) of shoulders, under blinded conditions, by the same observer, at least 2 weeks after the initial measurements. Descriptive statistics, intraclass correlation and regression coefficients were calculated with Stata BE 17 (R) software. A p-value of 0.05 was considered significant. A linear regression model was estimated resulting in the formula "Width = 10.97 + 0.02 * Age + 0.41 * Height - 1.95 * Sex (1=Female, 0=Male)". This model presented all coefficients with p < 0.05 and an adjusted R2 of 0.73. Furthermore, it fulfilled the assumption of linearity, normal distribution of errors, independence of errors, and homoscedasticity. Regarding the intraobserver correlation, ICC was 0.76 for height and 0.91 for width; the interobserver ICC was 0.93 for height and 0.86 for width. A 3D-CT specific formula was developed to predict glenoid fossa width based on height with sufficient accuracy to be clinically valuable.
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    Glenoid size and Orientation in the Chilean Population
    (2020) Contreras, Julio; Liendo, Rodrigo; Beltran, Manuel; Soza, Francisco
    Glenoid morphology is a key factor in determining the success of shoulder surgery. The purpose of this experimental study was to precisely determine the anatomical size and orientation of the glenoid in the Chilean population. 122 CT scans from asymptomatic Chilean patients were obtained. The mean age was 43.8 years (SD 12.3; range, 17-53 years) with 63 female and 59 male patients. For each of the scapulae, were obtained the glenoid version and inclination, maximum glenoid width and height, superior glenoid width, glenoid surface area, glenoid vault depth, and maximum scapular width. The glenoid size showed an average width of 26 +/- 2.7 mm, a height of 40.3 +/- 3.5 mm and a vault depth of 26.5 +/- 3.7 mm. There were significant differences between men and women. The glenoid orientation showed an average of -13.9 +/- 4.8 degrees of retroversion and a superior inclination of 11.1 +/- 4.7 degrees. Significant differences between men and women were seen only for version. We conclude, that in this Chilean sample the morphological parameters of the glenoid correspond to the published literature, however, some characteristics in this cohort must be further confirmed using other methods.