Clinical and radiographic results of expansive lumbar laminoplasty in patients with spinal stenosis.

Background: In 1981, we developed a technique of expansive lumbar laminoplasty to alleviate the problems of conventional laminectomy in the treatment of spinal stenosis. The purposes of this study were to assess the long-term outcome following expansive lumbar laminoplasty and to investigate the postoperative problems.

Methods: Fifty-four patients underwent expansive lumbar laminoplasty for the treatment of spinal stenosis.

Clinical and radiographic results of expansive lumbar laminoplasty in patients with spinal stenosis.

Background: In 1981, we developed a technique of expansive lumbar laminoplasty to alleviate the problems of conventional laminectomy in the treatment of spinal stenosis. The purposes of this study were to assess the long-term outcome following expansive lumbar laminoplasty and to investigate the postoperative problems.

Methods: Fifty-four patients underwent expansive lumbar laminoplasty for the treatment of spinal stenosis.

Separation and on-line concentration of bisphenol A and alkylphenols by micellar electrokinetic chromatography with anionic surfactant.

Separation and on-line concentration of bisphenol A and three alkylphenols were investigated by micellar electrokinetic chromatography with the anionic surfactant, sodium dodecyl sulfate. The separation conditions were optimized by the simultaneous addition of the organic solvent and cyclodextrin to the running solution. The separation of hydrophobic analytes and 4-nonylphenol isomers was improved by the addition of 10% methanol and 5 mM beta-cyclodextrin to the running solution.

Separation and on-line concentration of bisphenol A and alkylphenols by micellar electrokinetic chromatography with cationic surfactant.

The separation and on-line concentration of bisphenol A and three alkylphenols were investigated by micellar electrokinetic chromatography with cationic surfactant. Tetradecyltrimethylammonium bromide was used as surfactant and the separation conditions were optimized by the addition of the organic solvents and cyclodextrins to the running solution. The separation of hydrophobic analytes and 4-nonylphenol isomers was improved by the addition of 20% acetonitrile and 20 mM beta-cyclodextrin to the running solution.