The evolution of occipitocervical fixation and new rigid universal screw-rod construct technology has allowed secure anchorage at each level of the occipitocervical junction with the elimination of rigid external orthoses. Rigid occipitocervical instrumentation constructs have achieved higher fusion rates and less postoperative immobilization-associated complications. Outcomes have improved com...

The authors present the advantages and disadvantages of the Denis and AO classifications based on a review of classical and recent literature concerning the evolution of classification of thoracolumbar spine conditions. The newest classification of fractures proposed by Vaccaro (TLICS - Thoracolumbar Injury Classification Severity Score) is discussed in detail. Special attention is given to ins...

A new control technique for electro-dynamical transducer is presented which stabilizes the voice coil position, compensates for nonlinear distortion and generates a desired transfer response by preprocessing the electrical input signal. The control law is derived from transducer modeling using lumped elements and identifies all free parameters of the model by monitoring the electrical signals a...

We prove that under rather general assumptions an exactly controllable problem is uniformly stabilizable with arbitrarily prescribed decay rates. Our approach is direct and constructive and avoids many of the technical difficulties associated with the usual methods based on Riccati equations. We give several applications for the wave equation and for Petrovsky systems.

The case of a 20 years old male, diagnosed as supracristal ventricular septal defect (VSD) for last 6 years is being presented. He came in emergency department with decompensated congestive cardiac failure. After initial stabilization, he underwent transthoracic echocardiogram which showed large supracristal VSD, severely prolapsing right coronary cusp, severe aortic regurgitation and severe pu...

Translaminar facet screw fixation (TLFS) achieves stabilization of the vertebral motion segment by screws inserted at the base of the spinous process, through the opposite lamina, traversing the facet joint, and ending in the base of the transverse process. It is simple, does not require any specialized equipment, and has the advantages of being a procedure of lesser magnitude, lesser operative...

The paper presents our observations of femur shaft fractures healing treated by closed locked intramedullary nailing. The method is, from biological and biomechanical point of view, adventageous connection of conservative fracture treatment and operative method fulfilling stable osteosynthesis requirements and standards. Callus formation in the vicinity of fracture site confirms some elasticity...

Metastatic bone disease affects approximately 300,000 people in the United States, and the burden is rising. These patients experience significant morbidity and decreased survival. The management of these patients requires coordinated care among a multidisciplinary team of physicians, including orthopaedic surgeons. This article reviews the role of radiation therapy after orthopaedic stabilizat...