Bilateral developmental dysplasia of the hip treated with open reduction and Salter osteotomy: analysis on the radiographic results / Displasia do desenvolvimento do quadril bilateral tratada com redução cruenta e osteotomia de Salter: análise dos resultados radiográficos

Objectives: To evaluate the radiographic results from patients with bilateral developmental dysplasia of the hip (DDH) who underwent surgical treatment by means of open reduction and Salter osteotomy, with or without associated femoral shortening as described by Ombrédanne. Methods: This was a retrospective descriptive study in which 21 patients with bilateral DDH (42 hips) were analyzed. They were treated at Hospital Infantil Joana de Gusmão (HIJG), with operations between August 1997 and October 2009. To evaluate the radiographic results, the acetabular index and the Wiberg center-edge angle were measured, and the Severin and Kalamchi–MacEwen classifications were used. Descriptive and parametric statistical analyses were used to evaluate the data. Results: We did not observe any statistically significant difference in analyzing the radio-graphic parameters, making comparisons regarding the side affected, the order of the procedures and whether femoral shortening was performed, although there was a significant difference between them from before to after the operation. Conclusion: Open reduction in association with iliac osteotomy as described by Salter presented significant improvements in the radiographic parameters analyzed, comparing the pre- and postoperative values. This improvement occurred independently of whether Ombrédanne femoral shortening was performed. The most prevalent complication in the study group was avascular necrosis of the femoral head...

Objetivos: Avaliar os resultados radiográficos de pacientes portadores de displasia do desenvolvimento do quadril (DDQ) bilateral, submetidos ao tratamento cirúrgico por meio da redução cruenta e osteotomia de Salter associada ou não ao encurtamento femoral descrito por Ombrédanne. Métodos: Trata-se de estudo descritivo retrospectivo com análise de 21 pacientes com DDQ bilateral (42 quadris), tratados no Hospital Infantil Joana de Gusmão (HIJG) e operados entre agosto de 1997 e outubro de 2009. Para avaliação dos resultados radiográficos, foram medidos o índice acetabular e o ângulo center-edge (CÊ) de Wiberg e usadas as classificações de Severin e de Kalamchi e MacEwen. Análises estatísticas descritivas e paramétricas foram usadas para avaliação dos dados. Resultados: Não observamos diferença estatisticamente significante na análise dos parâmetros radiográficos comparando-os quanto ao lado acometido, à ordem dos procedimentos e à feitura de encurtamento femoral ou não, embora exista diferença significativa entre eles nos períodos pré e pós-operatório. Conclusão: Redução cruenta associada à osteotomia do ilíaco descrita por Salter apresentou melhoria significativa dos parâmetros radiográficos analisados na comparação dos valores pré e pós-operatórios. Essa melhoria ocorreu independentemente da feitura ou não do encurtamento femoral de Ombrédanne. A complicação mais prevalente no grupo estudado foi a necrose avascular da cabeça femoral...

Variabilidad en la medición del índice acetabular / Variability in measurement of acetabular index

Introducción: La Displasia del desarrollo de la cadera (DDC) es un espectro de enfermedades que abarca desde la luxación franca de la cadera hasta la displasia acetabular leve. El screening de detección de DDC se realiza de rutina en nuestro país, mediante una radiografía de pelvis a los 3 meses. El índice acetabular medido en estas radiografías se utiliza para evaluar la cadera displásica, tanto en la presentación inicial como durante el seguimiento posterior. Objetivo: Evaluar la variabilidad tanto intra como inter observador en la medición del índice acetabular, entre profesionales médicos. Material y Métodos: Cuatro evaluadores (un cirujano-ortopédico infantil, un médico general, un pediatra y un radiólogo) realizaron la medición del índice acetabular en 100 radiografías de screening (200 caderas), en tres ocasiones, separadas por un mes cada una (600 mediciones totales). Un observador independiente evaluó la reproductibilidad en la medición. Se utilizó el coeficiente de correlación intraclase para determinar diferencias significativas. Resultados: La variabilidad intra observador fue menor que la interobservador. La variabilidad intra observador fue similar para los diferentes evaluadores, +/- 1,5°. La variabilidad inter observador fue de +/- 3,4°. Conclusiones: Demostramos una alta concordancia entre las mediciones, determinando una alta reproductibilidad del índice acetabular. El índice acetabular es un método seguro para el diagnóstico y seguimiento de displasia acetabular.

Developmental dysplasia of the hip (DDH) is a spectrum of diseases ranging from frank dislocation of the hip to mild acetabular dysplasia. DDH screening for detection is performed routinely in our country using pelvic x-ray at 3 months of age. The radiographic measured acetabular index is used to evaluate the dysplastic hip, at initial presentation and during follow-up. Objective: Evaluation of the intra- and inter-observer variability, among medical professionals, when measuring acetabular index. Methods: Four reviewers (a children orthopedic surgeon, a general practitioner, a pediatrician and a radiologist) performed acetabular index measurement in 100 radiographs (200 hips), on three occasions, separated each by one month (600 total measurements). An independent observer evaluated the measurement reproducibility. The intra-class correlation coefficient to determine significant differences was used. Results: The intra-observer variability was less than the inter-observer variability. The intra-observer variability was similar among the different assessors, +/- 1.5 degrees. The inter-observer variability was +/- 3.4 degrees. Conclusions: A high concordance among measurements was reported, evidencing a high reproducibility of the acetabular index; this index is a reliable method for the diagnosis and follow-up of acetabular dysplasia.

Cementless Total Hip Arthroplasty for Patients with Crowe Type III or IV Developmental Dysplasia of the Hip: Two-Stage Total Hip Arthroplasty Following Skeletal Traction after Soft Tissue Release for Irreducible Hips

BACKGROUND: Total hip arthroplasty (THA) for severe developmental dysplasia of the hip (DDH) is a technically demanding procedure for arthroplasty surgeons, and it is often difficult to reduce the hip joint without soft tissue release due to severe flexion contracture. We performed two-stage THAs in irreducible hips with expected lengthening of the affected limb after THA of over 2.5 cm or with flexion contractures of greater than 30 degrees in order to place the acetabular cup in the true acetabulum and to prevent neurologic deficits associated with acute elongation of the limb. The purpose of this study is to evaluate the outcomes of cementless THA in patients with severe DDH with a special focus on the results of two-stage THA. METHODS: Retrospective clinical and radiological evaluations were done on 17 patients with Crowe type III or IV developmental DDH treated by THA. There were 14 women and 3 men with a mean age of 52.3 years. Follow-ups averaged 52 months. Six cases were treated with two-stage THA followed by surgical hip liberalization and skeletal traction for 2 weeks. RESULTS: The mean Harris hip score improved from 40.9 to 89.1, and mean leg length discrepancy (LLD) in 13 unilateral cases was reduced from 2.95 to 0.8 cm. In the patients who underwent two-stage surgery, no nerve palsy was observed, and the single one-stage patient with incomplete peroneal nerve palsy recovered fully 4 weeks postoperatively. CONCLUSIONS: The short-term clinical and radiographic outcomes of primary cementless THA for patients with Crowe type III or IV DDH were encouraging. Two-stage THA followed by skeletal traction after soft tissue release could provide alternative solutions to the minimization of limb shortenings or LLD without neurologic deficits in highly selected patients.

Cotyloplasty in Cementless Total Hip Arthroplasty for an Insufficient Acetabulum

BACKGROUND: Cotyloplasty is a technique that involves making a perforation of the medial wall of a shallow acetabulum and then inserting an acetabular cup with the medial aspect of its dome beyond the Kohler line. The purpose of this study was to evaluate the results of cementless total hip arthroplasty (THA) using cotyloplasty with focusing on the amount of medial cup protrusion. METHODS: Sixteen hips with insufficient acetabulum in sixteen patients were treated by cementless THA using cotyloplasty. The average patient age was 47 years. The diagnoses included dysplastic hip (12) and infection sequelae (4). All the patients were followed up for at least 2 years. Clinically, the Harris hip scores were assessed and radiologically, the amount of cup protrusion, the hip center movement and cup fixation were evaluated. RESULTS: The average Harris hip score improved from 57 to 94 postoperatively. The average proportion of cup surface beyond the Kohler line was 44.1% and the hip centers were medialized by an average of 23 mm. Stable fixation of the acetabular cup was achieved in all the cases except one. In this one case, migration of the cup was detected 2 weeks postoperatively and a reoperation was performed. CONCLUSIONS: Using cotyloplasty, good coverage of the acetabular cup was obtained without a block bone graft, and the hip joint centers were medialized. However, the safety margin for the amount of protrusion should be established.

La técnica de Ludloff en el manejo de la luxación congénita de cadera en niños de 6 a 18 meses de edad / Ludloff technique for treatment of congenital dislocation of the hip in children from 6 to 18 months of age

Se revisaron los expedientes clínicos de 38 pacientes con displasia del desarrollo de la cadera, con un total de 46 articulaciones afectadas; las edades variaron entre 6 y 18 meses. La valoración clínica se basó en los criterios de Mackay; la valoración radiológica de acuerdo a los criterios de Severin y la necrosis avascular con los criterios de Kalamchi. A todos los pacientes se les efectuó reducción abierta mediante el abordaje de Ludloff, pero en ocho de ellos se necesitó además acompañarse de un bordaje anterior y uno más en el segundo tiempo, osteotomía desrotadora. De acuerdo a los criterios de Mackay se obtuvieron excelentes resultados en 35 caderas, ocho caderas con buenos resultados. Con los resultados anteriores, podemos comentar que el abordaje medial permite el manejo de la mayoría de los factores que impiden la reducción concéntrica entre la epífisis femoral y el acetábulo, en el niño con una edad entre 6 y 18 meses; en caso de no obtenerse la concentricidad deseada, se puede agregar un abordaje anterior. Pues la obtención de una reducción perfecta traerá como consecuencia un adecuado desarrollo de dicha cadera

Displasia del desarrollo de la cadera / Dysplasia hip development

Los autores presentan una revisión de la displasia del desarrollo de la cadera, explican las razones que motivaron que se abandonara el uso del término "luxación congénita de cadera". Se examinan las causas intrauterinas predisponentes, cuadro clínico, diagnóstico y tratamiento en las diferentes etapas del desarrollo