Aminooxygenation of Ynamides with Hydroxybenzotriazoles: Synthesis of α-Benzotriazolyl Carbonyl Compounds.

Addition of hydroxybenzotriazoles to ynamides causes spontaneous rearrangement, resulting in α-benzotriazolyl imides. The transformation proceeded at rt in the absence of any catalyst but could be efficiently catalyzed by Zn(OTf). Crossover experiments confirmed that the rearrangement is an intramolecular process, most likely via a concerted mechanism.

Usefulness of prone cross-table lateral radiographs in vertebral compression fractures.

Background: Dynamic radiographs are recommended to investigate non-healing evidence such as the dynamic mobility or intravertebral clefts in osteoporotic vertebral compression fractures (VCFs). However, it is difficult to examine standing flexion and extension lateral radiographs due to severe pain. The use of prone cross-table lateral radiographs (PrLRs) as a diagnostic tool has never been proposed to our knowledge.

Asymmetry of the cross-sectional area of paravertebral and psoas muscle in patients with degenerative scoliosis.

Purpose: This study was undertaken to assess the change of psoas and paravertebral muscles in patients with degenerative scoliosis.

Methods: Eighty-five patients with degenerative scoliosis were evaluated with simple radiography for the location and direction of the apex of scoliosis, coronal Cobb's angle, rotational deformity and lumbar lordosis, and with magnetic resonance imaging scan at the apex level of each patient, the cross-sectional area (CSA) and the fatty infiltration rate (FI) of bilateral paravertebral and psoas muscles were measured and the values of convex and concave side were compared.

Results: Fifty-three patients had apex of curves on the left side and thirty-two patients on the right.

The feasibility of laminar screw placement in the subaxial spine: analysis using 215 three-dimensional computed tomography scans and simulation software.

Background Context: There have been several reports describing the usage of subaxial cervical laminar screws. However, the anatomic feasibility of placing such screws has not been thoroughly evaluated yet.

Purpose: To determine the feasibility of the laminar screw placement in the subaxial cervical spine using a large number of computed tomography (CT) scans and three-dimensional screw trajectory software.

Total hip arthroplasty for bilaterally ankylosed hips.

The purpose of this study was to evaluate the results of bilateral total hip arthroplasties (THAs) with special regard to angle of cup position in patients with bilaterally ankylosed hips. Twenty-four ankylosed hips were converted to THAs in 12 patients. Their mean age was 36 years and they were followed up for more than 3 years (average, 11 years).