Medición radiográfica del ángulo acetabular para el diagnóstico temprano de la displasia del desarrollo de la cadera / Radiographic measurement of the acetabular angle for early diagnosis of hip development dysplasia

Resumen: Antecedentes: Para evitar secuelas en la displasia del desarrollo de la cadera el tratamiento debe ser temprano; el ángulo acetabular corresponde a la inclinación del techo del acetábulo. Stanisavljevic indica que para medir adecuadamente el ángulo acetabular se deben colocar las caderas en abducción. Pregunta: ¿cuál es la magnitud de la diferencia de la medición radiográfica del ángulo acetabular entre las proyecciones anteroposterior de pelvis en posición neutra y con abducción de caderas? Métodos: Se tomaron 916 mediciones radiográficas comparando las de posición neutra contra las de abducción de caderas, de pacientes atendidos en consulta externa entre el 1 de Abril de 2010 y el 31 de Marzo de 2013. Resultados: Se realizaron pruebas t para medias de dos muestras emparejadas y se obtuvo una diferencia hipotética de las medias de 0.0000 y el coeficiente de correlación de Pearson para cadera derecha fue 0.74427531 y para la izquierda 0.73779866. Usando una Tabla propuesta de normalidad del ángulo acetabular según edad, se obtuvo el área bajo la curva en una distribución tgl457 = 0.650 con p = 0.516. El índice acetabular en posición neutra y con abducción de caderas es similar con alta significancia estadística, según el análisis de correlación de Pearson. Con base en la curva ROC, el índice acetabular en posición de rana tiene una alta sensibilidad y especificidad. Por tanto, la medición del índice acetabular en posición con abducción de caderas, tiene alta confiabilidad de lograr un diagnóstico correcto.

Abstract: Background: In order to avoid sequelae in the development dysplasia of the hip the treatment should be early; The acetabular angle corresponds to the inclination of the roof of the acetabulum. Stanisvljevic indicates that to properly measure the acetabular angle, the hips should be placed in abduction. Question: What is the magnitude of the difference in radiographic measurement of the acetabular angle between the anteroposterior projections of pelvis in neutral position and with abduction of hips? Methods: 916 radiographic measurements were taken by contrasting the neutral position against those of hip abduction, of patients in our clinic attended between April 1, 2010 and March 31, 2013. Results: T tests were performed for means of two matched samples and a hypothetical difference of the mean of 0.0000 was obtained and the Pearson correlation coefficient for right hip was 0.74427531 and for the left 0.73779866. Using a proposed Table of normality of the Acetabular angle according to age, the area was obtained under the curve in a distribution Tgl457 = 0.650 with P = 0.516. The index acetabular in neutral position and with abduction of hips is similar with high statistical significance, according to the analysis of correlation of Pearson. Based on the ROC curve, the acetabular index in frog position has a high sensitivity and specificity. Discussion: Therefore, the measurement of the acetabular index in position with hip abduction, has high reliability to achieve a correct diagnosis.

Relación entre el signo de entrecruzamiento y el ángulo de versión acetabular en tomografía axial computada / Association between the crossover sign and the acetabular version angle in axial computed tomography

Introduction.The crossover sign (CS) is proposed in the diagnosis of pincer-type femoroacetabular impingement (FAI). CS occurs in the cranial region of the acetabulum while the acetabular version angle (AV) is measured in the region where the acetabulum becomes deeper. Objective. To determine whether AV values measured in cranial regions using the classical measures relate better to the findings for positive CS. Material and Methods. Cross sectional study in asymptomatic patients. Images were obtained by CT of the abdomen and pelvis. They were recored in anterior-posterior reconstruction the CS and in axial reconstruction the AV angle. Logistic regression models for measuring AV in 7 cephalic levels to caudal with 95 percent CI were estimated. Results. 104 patients were measured. At Level 3 an area under ROC curve 0.81 (0.74-0.87), cutoff value of 11.2 degrees with sensitivity of 80.0 percent and specificity of 73.0 percent, was obtained. Conclusion. AV at level 3 has higher diagnostic capacity for the presence of positive CS.

Introducción. El signo de entrecruzamiento (SE) es propuesto en el diagnóstico imagenológico del pinzamiento Femoroacetabular tipo Pincer. El SE se produce en la región craneal del acetábulo, mientras que el ángulo de versión acetabular (VA) se mide en la región donde el acetábulo se hace más profundo. Objetivo. Determinar si valores de VA medidos en regiones craneales a la medida clásica se relacionan mejor al hallazgo de SE positivo. Material y Método. Estudio transversal en pacientes asintomáticos. Se obtuvieron imágenes mediante TC de abdomen y pelvis. Fueron consignados en reconstrucción antero-posterior el SE y en reconstrucción axial el ángulo de VA. Se estimaron modelos de regresión logística para la medición de VA en 7 niveles de cefálico a caudal con IC 95 porciento. Resultados. Fueron medidos 104 pacientes. En nivel 3 se obtuvo un área bajo curva ROC 0.81 (0.74-0.87), valor de corte 11.2 grados con sensibilidad de 80.0 porciento y especificidad de 73.0 porciento. Conclusión. VA en nivel 3 tiene mayor capacidad diagnóstica de la presencia de SE positivo.

Measurement and Meaning of the Change of Acetabular Angle and Femoral Anteversion in Congenital Dislocation of the Hip / 대한정형외과학회잡지

Recently, the treatment principles of congenital dislocation of the hip has been altered markedly. The importance of concentric reduction and its maintenance during growth period in CDH has been stressed by many authors. Acetabular remodelling capacity has been argued between many authors, because it was critical criteria about the determination of operating period and methods. Authors selected 25 cases of congenital dislocation of the hip, which was treated by closed reduction, open reduction and femoral osteotomy to obtain concentric reduction of the hip. And we analyzed the change of acetabular angle and femoral anteversion in two group: Group 1-below 2 years and Group 2-from 2 years to 4 years old. The results were as follows: 1. The change of acetabular angle was improved markedly: average 15° in the Group I and average 13° in the Group 2 in 2 years. 2. The change of femoral anteversion in the Group I was markedly improved: average 15°, but, the in the Group 2 was not significant: average 6°. 3. It was thought that the perfomance of femoral osteotomy without innominate osteotomy in the Group 2, could achieve the satisfactory acetabular remodelling.

Open Reduction of Congenital Dislocations of the Hip / 대한정형외과학회잡지

It is well-known that early diagnosis and treatment is still the most important aspect of congenital dislocation of the hip. However, the orthopaedist can not see the cbildren with dislocated hip before they begin to Walk, especially in the developing countries. When the children with dislocated hips are discovered lately,it is impossible to reduce the hip by simple manipulation, and also is very difficult to maintain the reduction successfully. Our method of treatment was based on the concept that the various components of the abnormal joint will develop satisfactorily into a normal hip provided acccurate congrucus and concentric reduction is obtained as early as possible to take advantage of the maximum growth potential, and is maintained throughout growth, In this study 16 children with 18 dislocated hips among the 75 children with congenitally dislocated hips were primarily treated by open reduction,followed by 3 weeks of temporary fixation of reduced hip by Kirschner wire and 6 weeks of cast immobilization from November 1973 to April 1979. They were clinically and roentgenologically analized. The end results of treatment were assessed by 3 roent- genological determinants; the medial joint space, the acetabular angle and the centeredge angle. The results obtained were as follows: 1. The pathologically widened medial joint space of hip or hips decreased rapidly during first 6 months after reduction, irrespective of the age at reduction, and satisfactory results were obtained in 83 per cent indicated by joint space distance less than 10 mm. 2. Postoperative Kirschner wire fixation of reduced hip to maintain the reduced position did not impair the physeal growth or bring the joint stiffness. 3. The acetabular angle improved rapidly during the first year after reduction in all age groups of patients and thereafter the rate of acetabular development decreased, but the acetabular angle continued to improve throughout the period of observation and satisfactorily (less than 25 degrees) developed in 83 per cent of children. 4. The center-edge angle increased rapidly during first three months after reduction and was satisfactory (more than 20 degrees) in 78 per cent. Overall success rate of treatment was 81.3 per cent. 5. Assessment of end results by medial joint space has more advantages in evaluating the result of treatment because of the aimplicity of it's measurement and leas error regardless of the change of patients position on roentgenagrams. 6. There were only few complications (11.1%) after surgical treatment; coxa magna in a case and resubluxation in another case were complicated. 7. Parameters utilized for assessing the results were faund to be the very helpful criteria to evaluate the hip development indicated by cephalocotyloid relation when used together. 8. Simultaneous open reduction followed by temporary internal fixation with K-wire was found to be recommendable method of treatment ae a first choice of treatment even in children under age of 3 if once nonsurgical reduction fails; because by this type of treatment more easily and accurately concentric reductions were obtained, and also reduction was more easily maintained without subsequeat redislocation.