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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) Uncemented knee arthroplasty: Supervivorship and long-term functional outcome
Información de la revista
Vol. 54. Núm. 2.
Páginas 106-110 (marzo - abril 2010)
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Vol. 54. Núm. 2.
Páginas 106-110 (marzo - abril 2010)
Original Article
Acceso a texto completo
Uncemented knee arthroplasty: Supervivorship and long-term functional outcome
Supervivencia y resultado funcional a largo plazo de prótesis de rodilla no cementadas
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1229
E.M. Ferrer-Santacreua, A.C. Moreno-Garcíaa,
Autor para correspondencia
acmoreno@jet.es

Corresponding author.
, G. Arroyo-Salcedoa, J.L. Leal-Helmlinga, P. Díaz-Freirea, E. Fernándezb, M. Ruiz-Yagüea, S. Bello-Pratsa
a Knee Unit, Orthopaedic and Trauma Surgery B Service, La Paz University Hospital, Madrid, Spain
b Biostatistics Section, La Paz University Hospital, Madrid, Spain
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Abstract
Purpose

To analyze the long term survivorship and functional results of a model of uncemented knee prosthesis.

Materials and methods

We carried out a prospective observational study of patients implanted between 1989 and 1996 with the Low Contact Stress Mobile-Bearing Total Knee Replacement (Depuy, Warsaw, IN, USA). Variables studied included: age, gender, followup, Knee Society Score, implant survivorship and reasons for revision. A total of 96 arthroplasties out of 127 reached the end of follow-up. Mean age was 79 years. Mean follow-up was 14 years. Eleven prostheses were revised (6 following aseptic loosening and 5 because of problems with the mobile bearings). Survivorship curves were obtained considering length of follow-up, time elapsed between the primary and the revision surgery and the “revision following loosening of a metal component” and “need for revision” events.

Results

When “need for revision” was considered as the endpoint, survivorship curves revealed a survivorship rate of 96.45% at 9 years and 92.78% at 12 years. When the endpoint was the “need to revise metal components” 14.5-year survivorship was 93.75%. Mean Knee Society Score was 89.2 points.

Conclusion

The use of the uncemented LCS knee has resulted in excellent clinical and functional results as measured by the Knee Society Score, as well as 93.75% survivorship at 14 years and a half, considering the survivorship of the metal implant.

Keywords:
Uncemented arthroplasty
Knee Society Score functional
Long-term survival
Resumen
Objetivo

Analizar la supervivencia a largo plazo y el resultado funcional de un modelo de prótesis de rodilla no cementada.

Material y método

Realizamos un estudio prospectivo observacional de pacientes operados entre los años 1989 y 1996 con el modelo Low Contact Stress Mobile-Bearing Total Knee Replacement(r) (Depuy, Warsaw, IN, EE. UU.). Las variables estudiadas fueron edad, sexo, tiempo de seguimiento, puntuación del Knee Society Score (KSS), supervivencia del implante y motivos de la revisión. Un total de 96 artroplastias de 127 completaron el seguimiento. La media de edad fue de 79 años. La media de seguimiento fue de 14,5 años. Once prótesis se reintervinieron (6 por aflojamiento aséptico de implantes y 5 por problemas de componentes móviles). Se obtuvieron curvas de supervivencia al considerar el tiempo de seguimiento, el tiempo desde la cirugía primaria hasta la reintervención y el episodio “recambio por aflojamiento de componente metálico” y “necesidad de reintervención”.

Resultados

Las curvas de supervivencia arrojaron una supervivencia del 96,45% a los 9 años y del 92,78% a los 12 años, y se consideró la “necesidad de reintervención” como punto final. Al considerar la necesidad de recambio de componentes metálicos, la supervivencia a los 14 años y medio fue del 93,75%. La puntuación media del KSS funcional fue de 89,2.

Conclusión

En nuestra experiencia y con el modelo protésico utilizado, las prótesis totales de rodilla no cementadas proporcionan un resultado clínico y funcional excelente, valorado por el KSS, y una supervivencia del 93,75% a los 14 años y medio al considerar la supervivencia del implante metálico.

Palabras clave:
Artroplastia no cementada
Knee Society Score funcional
Supervivencia a largo plazo
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Copyright © 2010. Sociedad Española de Cirugía Ortopédica y Traumatología (SECOT). All rights reserved
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