Introduction Transpedicular screw fixation is one of the most sophisticated procedures currently being used to stabilize the cervical spine. Anatomic studies have documented the external dimensions and angular parameters of the cervical pedicle, thereby providing the spinal surgeon with relevant information for accurate pedicle screw insertion [1,2]. Data is lacking, however, regarding its inte...

Treatment of unstable thoracolumbar burst fractures remains controversial. Long-segment pedicle screw constructs may be stiffer and impart greater forces on adjacent segments compared with short-segment constructs, which may affect clinical performance and long-term out come. The purpose of this study was to biomechanically evaluate long-segment posterior pedicle screw fixation (LSPF) vs short-...

BACKGROUND The training of orthopedic residents in adequate pedicle screw placement is very important. We sought to investigate orthopedic residents' perspectives on the use of computer-assisted surgery (CAS) in a training trial. METHODS Orthopedic residents were randomly assigned to independently place a screw using the free-hand technique and the CAS technique on 1 of 3 cadavers (Cobb angle...

there have been a number of developments in screw design and implantation techniques over recent years, including proposal of an alternative trajectory entitled as cortical bone trajectory (cbt). cortical bone trajectory has been investigated in recent medical treatments as an alternative for screw fixation aimed at increasing purchase of pedicle screws in higher density bone. cbt screw inserti...

pedicle screws provide rigid fixation for instabilities in the lumbar and lumbosacral spine. anatomical consideration and potential risk of neurologic complications are the reasons to hesitate using pedicle screws in the thoracic spine. twenty moulages similar to human vertebrae were instrumented with cotrel-dubousset (cd) system pedicle screw by intratransverse process, extrapedicular and intr...

Many successful attempts to increase pullout strength of pedicle screws in osteoporotic bone have been accompanied with an increased risk of catastrophic damage to the patient. To avoid this, a single-armed expansive pedicle screw was designed to increase fixation strength while controlling postfailure damage away from the nerves surrounding the pedicle. The screw was then subsequently tested i...

Surgical training using simulators has been shown to be highly effective but is not available for some applications and is too expensive for many programs. The authors piloted a cadaver-based module with the goal of objectively measuring and significantly improving orthopedic residents' surgical skills in placing thoracic pedicle screws, an advanced procedure. An experienced spine surgeon place...

BACKGROUND AND PURPOSE Lumbar pedicle marrow hyperintense signal on T2- and STIR-weighted images is not an uncommon finding. We hypothesize that these marrow signal intensity changes and their behavior within the pedicle are associated with clinical symptoms and that their improvement or resolution correlates with clinical improvement. We investigated the prevalence of these pedicle marrow chan...

A new species of bathyergid mole-rat, Fukomys vandewoestijneae, is described from an area on the Zaïre-Zambezi watershed, centred on the Ikelenge pedicle in the North-Western province of Zambia. It is diagnosed by a unique combination of morphological (size, lack of clear headmarks), chromosomal (2n= 44) and DNA sequence characteristics. This medium-sized species belongs to the Giant mole-rat "...

INTRODUCTION We present the method of pedicle labial urethroplasty for urethral reconstruction in female patients treated for urethral strictures. PATIENTS AND METHODS We performed urethral reconstruction using a pedicle labial flap in 2 female patients (23 and 70 years old) for urethral stricture (posttraumatic and postinflammatory origin). We used as a patch a pedicle skin flap obtained fro...