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Reevaluation of the Pavlov Ratio in Patients with Cervical Myelopathy
Clinics in Orthopedic Surgery ; : 6-10, 2009.
Artigo em Inglês | WPRIM | ID: wpr-72020
ABSTRACT

BACKGROUND:

This study was designed to reevaluate the effectiveness of the Pavlov ratio in patients with cervical myelopathy.

METHODS:

We studied 107 patients who underwent open door laminoplasty for the treatment of cervical myelopathy between the C3 to C7 levels. We determined the Pavlov ratio on preoperative and postoperative cervical spine lateral radiographs, the vertebral body-to-canal ratio on sagittal reconstruction CT scans, and the vertebral body-to-cerebrospinal fluid (CSF) column ratio on T2-weighted sagittal MR images from C3 to C6. The severity of myelopathy was determined using the JOA score on both preoperative and postoperative images. The recovery rate was also calculated. The Pavlov ratio in plain radiographs from patients with myelopathy was compared with the ratio of the vertebral body to the spinal canal on CT and MRI.

RESULTS:

The average Pavlov ratio between C3 and C6 ranged from 0.71 to 0.76. On CT scan, the average vertebral body-to-canal ratio between C3 and C6 ranged from 0.62 to 0.66. On MRI, the vertebral body-to-CSF column ratio between C3 and C6 ranged between 0.53 and 0.57. A positive correlation was noted between the Pavlov ratio and the vertebral body-to-canal ratio on sagittal-reconstruction CT (correlation coefficient = 0.497-0.627, p = 0.000) and between the Pavlov ratio and the vertebral body-to-CSF column ratio on MRI (correlation coefficient = 0.511-0.649, p = 0.000).

CONCLUSIONS:

We demonstrated a good correlation between the Pavlov ratio and both the vertebral body-to-canal ratio on CT and the vertebral body-to-CSF column ratio on MRI. Therefore, the Pavlov ratio can be relied upon to predict narrowing of the cervical spinal canal in the sagittal plane.
Assuntos

Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Valores de Referência / Canal Medular / Doenças da Medula Espinal / Imageamento por Ressonância Magnética / Tomografia Computadorizada por Raios X / Variações Dependentes do Observador / Líquido Cefalorraquidiano / Vértebras Cervicais / Valor Preditivo dos Testes / Estudos Retrospectivos Tipo de estudo: Estudo observacional / Estudo prognóstico Limite: Adulto / Idoso / Aged80 / Feminino / Humanos / Masculino Idioma: Inglês Revista: Clinics in Orthopedic Surgery Ano de publicação: 2009 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Valores de Referência / Canal Medular / Doenças da Medula Espinal / Imageamento por Ressonância Magnética / Tomografia Computadorizada por Raios X / Variações Dependentes do Observador / Líquido Cefalorraquidiano / Vértebras Cervicais / Valor Preditivo dos Testes / Estudos Retrospectivos Tipo de estudo: Estudo observacional / Estudo prognóstico Limite: Adulto / Idoso / Aged80 / Feminino / Humanos / Masculino Idioma: Inglês Revista: Clinics in Orthopedic Surgery Ano de publicação: 2009 Tipo de documento: Artigo