Percutaneous full endoscopic posterior decompression of thoracic myelopathy caused by ossification of the ligamentum flavum.

Purpose: Ossification of ligamentum flavum (OLF) is the leading cause of progressive thoracic myelopathy (TM) in East Asian countries. Surgical decompression is the general treatment for TM. This study investigated the application of percutaneous full endoscopic posterior decompression (PEPD) for the treatment of thoracic OLF.

[Soil nitrogen content and enzyme activities in rhizosphere and non-rhizosphere of summer maize under different nitrogen application rates.].

A field experiment was conducted on fluvo-aquic soil in the North China Plain to study the effects of nitrogen application rate on soil nitrogen contents and enzyme activities in rhizosphere and non-rhizosphere of summer maize. The results showed that the soil enzyme activities under different nitrogen application rates showed similar seasonal patterns. In comparison to no nitrogen ferti-lizer treatment, all nitrogen application treatments significantly increased NO-N contents in rhizosphere and non-rhizosphere soils, NH-N content in rhizosphere soil and the activities of β-N-acetylglucosaminidase, β-glucosidase, β-xylosidase and Cellobiohyrolase.

[Mini-incision posterior laminectomy by fenestration in the treatment of huge lumbar disc herniation].

Objective: To discuss clinical effects and methods of mini-incision posterior laminectomy by fenestration in the treatment of huge lumbar disc herniation.

Methods: From 1999 to 2008,107 patients with huge protruded lumbar intervertebral disc were retrospectively analyzed including 78 males and 29 females with an average age of 38.5 years ranging from 26 to 59 years.