Resumen de Resultados funcionales y dolor en pacientes intervenidos con sistemas de estabilización dinámica interespinosa frente a artrodesis intervertebral
Motivación de la tesis: Analizar si la adición de un espaciador interespinoso o la fusión intersomática ofrece ventajas en relación con la microdiscetomía aislada en el tratamiento de la hernia discal lumbar.
Desarrollo teórico: Pacientes con hernia de disco lumbar que iban a someterse a cirugía fueron elegidos para participar. En este estudio de cohorte los pacientes se dividieron en 3 grupos; Microdiscectomía sola (MD), microdiscectomía más espaciador interespinoso (IS) y fusión intersomática lumbar posterior (PLIF). La medida de resultado primaria fue la eficacia clínica mediante el índice de discapacidad de Oswestry (ODI). También evaluamos varios otros parámetros de resultado, entre los que se incluyeron: escala analógica visual para el dolor (EVA) de espalda y piernas, duración de la estancia, coste desde el ingreso hasta el alta hospitalaria, tasa de complicaciones de 90 días y tasa de reoperación tras 1 año.
Se incluyeron un total de 103 pacientes cuya edad media fue de 39,1 (± 8,5) años. En los 3 grupos se detectó una mejora significativa de la puntuación inicial del dolor de espalda y piernas con ODI y EVA. Las puntuaciones del ODI cambiaron de 62.66 a 13.77 en el grupo MD, 62.93 a 13.50 en el grupo IS, y 59.62 a 17.62 en el grupo PLIF (p <0.001). Después de 1 año, no se encontraron diferencias significativas en el ODI, ni en la EVA de espalda y piernas entre los 3 grupos.
Hubo un aumento del 169% en el coste hospitalario en el grupo IS y del 287% en el grupo PLIF, en relación con la MD (p <0,001). La duración de la estancia fue un 86% mayor en el grupo IS y un 384% más en el grupo PLIF en comparación con MD (p <0,001). Las tasas de reoperación a 1 año fueron de 5,6%, 10% y 16,2% (p = 0,33) en los grupos MD, IS y PLIF respectivamente.
Conclusión: La mejoría clínica parece deberse a la microdiscectomía, sin que el implante (interespinoso o fusión) agregue ningún beneficio. La adición de espaciador interespinoso o fusión no protegió contra la reoperación, y aumentó la duración de la estancia hospitalaria y los gastos quirúrgicos.
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