Polyaxial Screws in Locked Plating of Tibial Pilon Fractures.

This study examined the axial and torsional stiffness of polyaxial locked plating techniques compared with fixed-angle locked plating techniques in a distal tibia pilon fracture model. The effect of using a polyaxial screw to cross the fracture site was examined to determine its ability to control relative fracture site motion. A laboratory experiment was performed to investigate the biomechanical stiffness of distal tibia fracture models repaired with 3.

Bone loss following spinal cord injury in a rat model.

The current study was undertaken to follow the time course of bone loss in the proximal tibia of rats over several weeks following thoracic contusion spinal cord injury (SCI) of varying severity. It was hypothesized that bone loss would be more pronounced in the more severely injured animals, and that hindlimb weight bearing would help prevent bone loss. Twenty-six female Sprague-Dawley rats (200-225 g, 6-7 weeks old) received standard thoracic (T9) injuries at energies of 6.

Xenograft bone inclusion improves incorporation of hydroxyapatite cement into cancellous defects.

Objectives: Hydroxyapatite cement (HAC) is biocompatible and osteoconductive, but its slow resorption limits new bone formation. The purpose of this investigation was to determine the effects of adding partially demineralized xenograft cortical bone in an established animal model.

Methods: Eight 6-month-old female New Zealand white rabbits were used.

Anterolateral and medial locking plate stiffness in distal tibial fracture model.

Background: The purpose of this study was to compare the axial and torsional stiffness between anterolateral and medial distal tibial locking plates in a pilon fracture model.

Materials And Methods: The biomechanical stiffness of anterolateral or medial plated pilon fracture models was evaluated. Six Sawbones Composite Tibiae with a simulated pilon fracture representing varus or valgus comminution (OTA 43-A2.

Are they just lazy? Student teachers' attitudes about dyslexia.

It is highly likely that teachers' abilities in dealing with different forms of learning difficulties will be affected by their knowledge about and attitudes towards those difficulties. Ajzen's Theory of Planned Behaviour (TPB) provides a useful framework within which to explore such attitudes and was used as the starting point for investigating trainee teachers' attitudes towards aspects of dyslexia. It is assumed that new teachers will enter the profession with a set of intentions according to personal beliefs, normative views within the teaching profession and the sense of competence and power they feel in dealing with dyslexic difficulties.

In vivo micro-CT scanning of a rabbit distal femur: repeatability and reproducibility.

Before in vivo micro-CT scanning can be used to investigate femoral trabecular microarchitecture over time in rabbits, its repeatability and reproducibility must be demonstrated. To accomplish this, both distal femurs of two 6-month-old New Zealand white rabbits were scanned five times each in 1 day under different conditions (repeatability). Scanning was done at 28 microm isotropic voxel size to produce five image stacks of each femur.

Mechanical study of the safe distance between distal femoral fracture site and distal locking screws in antegrade intramedullary nailing.

Objective: To determine the safe distance for distal femoral fractures relative to the distal locking screws in antegrade intramedullary femoral nailing using a currently available titanium alloy nail design.

Design: Cyclic (fatigue) mechanical testing study.

Setting: Biomechanics laboratory.