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Vol. 52. Issue 2.
Pages 71-76 (March - April 2008)
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Vol. 52. Issue 2.
Pages 71-76 (March - April 2008)
Original paper
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Anterior femoro-acetabular impingement. Radiological signs in young patients diagnosed with hip osteoarthritis
Atrapamiento fémoro-acetabular anterior. Signos radiológicos en pacientes jóvenes diagnosticados de coxartrosis
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J. Duart, J. Del Río, J. Mönckeberg, J.R. Valentí
Corresponding author
jrvalenti@unav.es

Corresponding author: Departamento de Cirugía Ortopédica y Traumatología. Clínica Universitaria de Navarra. C/ Pío XII, 36. 31080 Pamplona. Navarra.
Department of Orthopedic and Trauma Surgery. Navarre University Clinic. Pamplona
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Purpose

To determine the incidence of the characteristic radiological signs of anterior femoro-acetabular impingement (AFAI) in young patients diagnosed with idiopathic hip osteoarthritis.

Materials and methods

Retrospective review of the clinical records of patients under 50 years of age diagnosed with idiopathic hip osteoarthritis between 1995 and 2000. The functional assessment of the hip was made by means of the Merle D’Aubigne scale. The radiological study that revealed the presence of the figure-of-8 sign and the head/neck bump sign. The hip joint was evaluated by means of Tönnis’ scale.

Results

Fifty-one (43%) of the 121 patients under 50 were diagnosed with idiopathic hip osteoarthritis. We reviewed 45 hips. The mean age in this group was 44.5 years (range: 30-50). The mean value obtained on the Merle d’Aubinge scale was 16 (range: 12-17). In 10 hips (22%) the figure-of- 8 sign was observed, in 26 (58%) the head/neck bump sign was observed. Both signs were observed in 6 cases (13%). Thirty hips (66%) presented with at least one of these radiological signs. In 18 hips (60%) lytic images were seen in the proximal femur. Seventy percent of patients that had at least one of the characteristic signs of FAI were grade I on the Tonnis classification; the remaining 30% were grade II.

Conclusions

In our series, 66% of patients diagnosed with idiopathic hip osteoarthritis presented, at the time when the diagnosis was made, radiological signs characteristic of AFAI. Also, AFAI could be construed as the cause for the primary hip osteoarthritis in some of the patients.

Key words:
hip
hip osteoarthritis
femoro-acetabular impingement
young adults
radiological signs
Objetivo

Determinar la incidencia de los signos radiológicos característicos del atrapamiento fémoro-acetabular anterior (AFA) en pacientes jóvenes diagnosticados de coxartrosis idiopática.

Material y método

Revisión retrospectiva de historias clínicas de los pacientes menores de 50 años diagnosticados de coxartrosis idiopática entre los años 1995 y 2000. Evaluación funcional de la cadera con la escala de Merle D’Aubigne. Estudio radiológico, donde se observa la presencia del signo del lazo y el signo de la giba, así como la valoración de la articulación coxofemoral con la escala de Tönnis.

Resultados

Cincuenta y uno (43%) de los 121 pacientes menores de 50 años fueron diagnosticados de coxartrosis idiopática. Revisamos 45 caderas, con una edad media del grupo de 44,5 años (30-50). El promedio de los valores obtenidos en la escala de Merle d’Aubinge fue de 16 (12-17). En 10 caderas (22%) se observó el signo del lazo, en 26 (58%) se evidenció el signo de la giba, y en seis casos ambos signos (13%). En 30 caderas (66%) se observaron algunos de estos signos radiológicos. En 18 (60%) caderas se apreciaron imágenes líticas en el fémur proximal. El 70% de los pacientes en los que se observó alguno de los signos característicos del AFA presentaba un grado I en la clasificación de Tönnis, el 30% restante presentó un grado II.

Conclusiones

En nuestra serie un 66% de los pacientes diagnosticados de coxartrosis idiopática presentaban, en el momento del diagnóstico, signos radiológicos característicos de AFA. Algunos de los pacientes diagnosticados de coxartrosis primaria podrían corresponder a un AFA como causa inicial de su coxartrosis.

Palabras clave:
cadera
coxartrosis
atrapamiento fémoroacetabular
adultos jóvenes
signos radiológicos
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Copyright © 2008. Sociedad Española de Cirugía Ortopédica y Traumatología (SECOT). All rights reserved
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