This paper continues an earlier study of giant planet migration, examining the effect of planet mass and disc viscosity on the migration rate. We find that the migration rate of a gap-opening planet varies systematically with the planet’s mass, as predicted in our earlier work. However, the variation with disc viscosity appears to be much weaker than expected.

BACKGROUND To investigate the effect of oxygen-ozone (O2-O3) injection on thoracolumbar intervertebral disc herniation (IVDH) in dogs. MATERIALS AND METHODS Ten herniated discs of five dogs were treated with percutaneous injection of an O2-O3 gas mixture with O3 concentration of 32 microg/microl intradiscally (1.5-2 microl) under fluoroscopy guidance. RESULTS Five weeks after treatment, the...

Congenital and surgical defects of the neural arches of the spine have provided sonic windows and new applications for sonography in neuroradiology [1, 2]. The contents of the lumbar spinal canal can also be seen by an anterior approach, through the intervertebral disk, as illustrated in a recent atlas of sonography [3]. However, no previous report has been found on the use of sonography in the...

BACKGROUND AND PURPOSE Intervertebral disk biochemical composition could be accessed in vivo by T1ρ and T2 relaxometry. We found no studies in the literature comparing different segmentation methods for data extraction using these techniques. Our aim was to compare different manual segmentation methods used to extract T1ρ and T2 relaxation times of intervertebral disks from MR imaging. Seven di...

Chronic low back pain is the most common cause of disability in individuals between the ages of 45 and 65. Given the variety of anatomic and pathophysiologic causes of persistent low back pain, it is a difficult diagnosis for clinicians to treat. Discography is a diagnostic option that may link a patient's subjective complaints of spinal pain to symptomatic disk disease when non-invasive imagin...

A 12-year-old, castrated male Maltese dog was presented due to a sudden onset of tetraparesis. A ventral, extradural compressive lesion at the C4-5 intervertebral disk space, most compatible with an intervertebral disk extrusion was found by radiography, myelography and computed tomography. The dog received ventral slot surgery for cervical intervertebral disk hernia. After the surgery, the dog...