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Revista Española de Cirugía Ortopédica y Traumatología (English Edition)
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Inicio Revista Española de Cirugía Ortopédica y Traumatología (English Edition) Concordance and reproducibility in the assessment of humeral radiolucencies in c...
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Vol. 53. Issue 1.
Pages 1-7 (January - February 2009)
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Vol. 53. Issue 1.
Pages 1-7 (January - February 2009)
Original papers
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Concordance and reproducibility in the assessment of humeral radiolucencies in cemented shoulder hemiarthroplasties
Estudio de concordancia y reproducibilidad en la evaluación de las radiotransparencias humerales en las hemiartroplastias cementadas de hombro
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S. Martínez-Díaz
Corresponding author
94064@imas.imim.es

Corresponding author.
, C. Torrens, M. Corrales, E. Melendo, E. Cáceres
Department of Orthopedic and Trauma Surgery, IMAS Hospitals, del Mar and La Esperanza Hospitals, Barcelona, Spain
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Abstract
Purpose

To assess concordance and reproducibility in the observation of radiolucent lines of the humeral prosthetic component in cemented shoulder hemiarthroplasties.

Materials and methods

Five observers evaluated 128 X-rays obtained from 32 cemented shoulder hemiarthroplasties at 2 points of time during follow-up in anteroposterior and scapular Y views; a re-evaluation was made after 3 weeks. Radiolucent lines were studied in 7 areas around the implant at the cement-bone and cement-implant interfaces. Radiolucencies were classified into 4 categories according to their size in millimeters. Results were assessed with the kappa statistical method.

Results

In the study of intraobserver reproducibility kappa indices of 0 to 0.6 were obtained for the implant-cement and cement-bone interfaces. In the study of interobserver concordance for each of the areas and interfaces, 65% of kappa indices obtained range between 0 and 0.4. Intraobserver capacity to follow up one same patient in time was assessed on the basis of the percentage of possible responses by each observer, which ranged between 85 and 90%.

Conclusions

A low rate of concordance and reproducibility is obtained when analyzing radiolucencies both at the bone-cement and at the cement-implant interfaces. There is also a low error index when analyzing the evolution of radiolucencies in 2 X-rays of the same implant obtained at 2 different points in time.

Keywords:
Shoulder hemiarthroplasty
Radiolucency
Aseptic loosening
Radiological analysis
Intraobserver variability
Interobserver variabilit
Resumen
Objetivo

evaluar la concordancia y la reproducibilidad en las observaciones de las líneas de radiotransparencia del componente protésico humeral en las hemiartroplastias cementadas de hombro.

Material y método

cinco observadores han evaluado 128 radiografías obtenidas de 32 hemiartroplastias cementadas de hombro en dos momentos del seguimiento evolutivo en proyecciones anteroposterior y perfil de escápula, con una reevaluación a las 3 semanas. Se han evaluado las líneas de radiotransparencia en 7 zonas alrededor del implante en las interfaces cemento-hueso y cemento-implante. Se han clasificado las radiotransparencias en cuatro categorías según el tamaño en milímetros. Se han evaluado los resultados con el método estadístico kappa.

Resultados

en el estudio de la reproducibilidad intraobservador se han obtenido para las interfaces implante-cemento y cemento-hueso índices kappa de 0 a 0,6. En el estudio de la concordancia entre observadores para cada una de las zonas e interfaces el 65% de los índices kappa obtenidos oscilan entre 0 y 0,4. La capacidad intraobservador de seguimiento en el tiempo de un mismo paciente se ha evaluado por el porcentaje de respuestas posibles de cada observador que ha oscilado entre el 85 y el 90%.

Conclusiones

hay un bajo índice de concordancia y reproducibilidad al analizar las radiotransparencias tanto en la interfaz hueso-cemento como en la de cemento-implante. También hay un bajo índice de errores al analizar la evolución de las radiotransparencias en dos radiografías del mismo implante obtenidas en dos momentos diferentes en el tiempo.

Palabras clave:
Hemiartroplastia de hombro
Radiotransparencia
Aflojamiento aséptico
Análisis radiológico
Variabilidad intraobservador
Variabilidad entre observadores
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Copyright © 2009. Sociedad Española de Cirugía Ortopédica y Traumatología (SECOT). All rights reserved
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