RESUMEN
This study aimed to assess the fusion of growth plates and the development of secondary ossification centres in the forelimb bones of maned wolves (Chrysocyon brachyurus), contrasting the findings with established data from domestic dogs. Three maned wolves, comprising one male and two females, initially aged between 3 and 4 months, were subjected to monthly radiographic evaluations until 10-11 months of age, followed by bimonthly assessments until 18-19 months of age, encompassing both forelimbs. The closure times of growth plates were observed as follows: supraglenoid tubercle (7-8 months), proximal humerus (17-19 months), distal humerus (8-9 months), medial epicondyle of the humerus (8-9 months), proximal ulna (9-10 months), proximal radius (13-15 months), distal ulna (13-15 months) and distal radius (17-19 months). Statistical analysis revealed significant differences in the areas of secondary ossification centres in the proximal epiphyses of the humerus and radius, respectively, observed from the initial evaluation at 8-9 months and 6-7 months. Conversely, the epiphyses of the supraglenoid tubercle, distal humerus, proximal ulna, distal ulna, medial epicondyle of the humerus and distal radius did not exhibit significant area differences between 3-4 months and 4-5 months, yet notable distinctions emerged at 5-6 months. In summary, while the radiographic appearance of epiphyseal growth plates and secondary ossification centres in maned wolves resembles that of domestic dogs, closure times vary. These findings contribute to understanding the dynamics of epiphyseal growth plates in this species.
Asunto(s)
Desarrollo Óseo , Canidae , Miembro Anterior , Húmero , Radio (Anatomía) , Cúbito , Animales , Miembro Anterior/anatomía & histología , Miembro Anterior/diagnóstico por imagen , Masculino , Femenino , Canidae/anatomía & histología , Radio (Anatomía)/diagnóstico por imagen , Radio (Anatomía)/anatomía & histología , Radio (Anatomía)/crecimiento & desarrollo , Cúbito/diagnóstico por imagen , Cúbito/anatomía & histología , Cúbito/crecimiento & desarrollo , Desarrollo Óseo/fisiología , Húmero/anatomía & histología , Húmero/diagnóstico por imagen , Húmero/crecimiento & desarrollo , Placa de Crecimiento/diagnóstico por imagen , Placa de Crecimiento/anatomía & histología , Placa de Crecimiento/crecimiento & desarrollo , Radiografía/veterinaria , Osteogénesis/fisiología , Perros/anatomía & histología , Perros/crecimiento & desarrolloRESUMEN
The wrist and hand region has been the most commonly used for estimating age and osseous development due to the great number of ossification centers. The aim was to determine which method, Tanner & Whitehouse's (TW3), Greulich & Pyle's (GP) or Eklof & Ringertz's, more closely relates to the chronological age in subjects with Down syndrome with chronological ages between 61 and 180 months, using wrist and hand radiographs. The sample consisted of 85 radiographs, 52 of males and 33 of females. Eklof & Ringertz's method was computerized (Radiomemory). Greulich & Pyle's atlas was used and compared with the wrist and hand radiographs. For the TW3 method, 13 ossification centers were evaluated; for each one of them, there are seven or eight development stages to which scores are assigned; these scores are then added and the results are transformed into osseous age values. No statistically significant differences were observed between the male and female genders for methods TW3 and GP, contrasting with the observed differences for the Eklof & Ringertz method. Correlation (r2) between osseous and chronological ages was 0.8262 for TW3 and 0.7965 for GP, while for the method of Eklof & Ringertz, it was 0.7656 for females and 0.8353 for males. The author concluded that the osseous age assessment method that better related to the chronological age was the TW3, followed by Greulich & Pyle's and Eklof & Ringertz's.
Asunto(s)
Determinación de la Edad por el Esqueleto/métodos , Huesos del Carpo/diagnóstico por imagen , Síndrome de Down/fisiopatología , Huesos de la Mano/diagnóstico por imagen , Adolescente , Factores de Edad , Desarrollo Óseo/fisiología , Huesos del Carpo/crecimiento & desarrollo , Niño , Preescolar , Femenino , Huesos de la Mano/crecimiento & desarrollo , Humanos , Procesamiento de Imagen Asistido por Computador/métodos , Masculino , Osteogénesis/fisiología , Radio (Anatomía)/diagnóstico por imagen , Radio (Anatomía)/crecimiento & desarrollo , Cúbito/diagnóstico por imagen , Cúbito/crecimiento & desarrolloRESUMEN
Bone age is widely used as an osseous maturation method to assess biological development in clinical and auxological studies. Numerical methods for calculating bone age have better replicability; however, they require a wide data manipulation. The aim of this study was to evaluate the accuracy of bone age estimation by using just a few ossification centers. In 205 hand and wrist radiographs of children and adolescents, aged 0.9-17.4 years old (111 males and 94 females), bone age was determined by two trained observers employing the five-bone (B5) and the TW2 methods. To compare the results of the two methods, the mean differences by age and sex were tested by the Mann-Whitney test. The relationship of the bone age distribution estimated by B5 and TW2 was calculated and the mean of the bone age determined by the two methods was plotted by age and by differences between bone age calculated by the two methods +/- 2 SD. The bone age determined by B5 was between 1.2 and 16.8, and by TW2 was between 1.2 and 18.0 years. The mean differences between B5 and TW2 (-0.06 +/- 0.6) were not significant (p > 0.05). The distribution of mean differences by age and method demonstrated that all deviations were encompassed into +/- 2 SD with no particular bias. In general terms, a good agreement was obtained between these two methods.
Asunto(s)
Determinación de la Edad por el Esqueleto/métodos , Desarrollo Óseo , Adolescente , Huesos del Carpo/crecimiento & desarrollo , Niño , Preescolar , Femenino , Dedos/crecimiento & desarrollo , Humanos , Lactante , Masculino , Radio (Anatomía)/crecimiento & desarrollo , Reproducibilidad de los Resultados , Cúbito/crecimiento & desarrollo , Muñeca/crecimiento & desarrolloRESUMEN
Se estudia una muestra de 15 jóvenes integrantes del equipo nacional cubano de kayaks comprendido entre los 17 y 21 años de edad, del sexo masculino, con la finalidad de observar la posibilidad de influir la actividad física que realizan estos individuos, sobre el crecimiento de los huesos del antebrazo. Se realizó a cada individuo una radiografía anteroposterior del antebrazo. Posteriormente se realizaron mediciones dela longitud y grosor de diferentes porciones del radio y la ulna con un Vernier de precisión hasta 0,01 mm. Los datos obtenidos por las mediciones fueron analizados por el test de Mann-Witney. Se comprobó mayor crecimiento óseo en los deportistas. No se observaron diferencias significativas al comparar los huesos de los antebrazos derecho e izquierdo (AU)