Head-locking durability of fixed and variable angle locking screws under repetitive loading.

Polyaxial locking screws are increasingly applied in fracture fixation. To investigate the durability of the head-locking mechanism, the removal torque of variable angle (VA) and fixed angle (FA) stainless steel and titanium locking screws was investigated without and after a cyclic loading test. Stainless steel (St) and titanium (Ti) 2.

Concept of variable angle locking--evolution and mechanical evaluation of a recent technology.

Applications for fracture-adapted screw positioning offered by variable angle locking screws are increasing. The locking strength of the variable angle locking mechanism at different insertion angles was compared to conventional fixed angle locking screws. Stainless steel (S) and titanium (Ti) variable and fixed angle 2.

A biomechanical study on proximal plate fixation techniques in periprosthetic femur fractures.

Introduction: Proximal plate fixation is a crucial factor in osteosynthesis of periprosthetic femur fractures. Stability and strength of different fixation concepts for proximal plate fixation were compared.

Materials And Methods: Twelve fresh frozen, bone mineral density matched human femora, instrumented with cemented hip endoprosthesis were osteotomized simulating a Vancouver B1 fracture.

Mechanical behavior of fixation components for periprosthetic fracture surgery.

Background: Reliable periprosthetic fracture treatment needs detailed knowledge on the mechanical behavior of the fixation components used. The holding capacity of three conventional fixation components for periprosthetic fracture treatment was systematically investigated under different loading directions.

Methods: Locking compression plates were fixed to a 7 cm long part of diaphyseal fresh frozen human femur with either a single 1.

Biomechanical performance of different cable and wire cerclage configurations.

Purpose: Cerclage technology is regaining interest due to the increasing number of periprosthetic fractures. Different wiring techniques have been formerly proposed and have hibernated over years. Hereby, they are compared to current cerclage technology.

Underneath the cerclage: an ex vivo study on the cerclage-bone interface mechanics.

Introduction: Cerclages regain interest due to a rising number of periprosthetic fractures. The contact distribution at the circumferential cerclage-bone interface is still unknown. Local interface pressure depends on the amount of contact area.

Bone regeneration in long-bone defects: tissue compartmentalisation? In vivo study on bone defects in sheep.

Regeneration of living tissue varies with species, age and type of tissue, and undoubtedly with the biological and mechanical environment of the precise tissue. Autologous cancellous bone grafting is a well-known technique that provides bony regeneration. We investigated the efficiency of autologous bone grafting in a well-vascularised muscle environment, and additionally when isolated from the muscle and connected only to the bony environment.

Internal fixator for use in the mouse.

Knockout techniques enable us to expand our knowledge about bonerepair processes. Since they require the use of mice, such studies necessitate the development of special technologies. Mechano-biological reactions play a determining role in fracture healing, and therefore controlled conditions of stability are essential.

Effect of fracture gap on stability of compression plate fixation: a finite element study.

In compression plating, anatomical reduction and compression across the fracture site are the basic principles necessary to achieve primary bone healing. However, varying amounts of gap at the fracture site frequently occur due to technical pitfalls, such as overbending of the plate and inaccurate reduction, and due to the fracture configuration itself. Little is known as to how fracture gap affects stability of the bone-plate construct.

Fracture healing. The evolution of our understanding.

Our understanding of fracture healing has undergone an evolution over many decades with continuous improvement of fracture treatment. Solid union is a precondition of restoring the function of a fractured bone. The goal of the early treatment of the fracture was focussed upon enabling solid union in acceptable alignment of the fracture.

Surgical aspects of infection involving osteosynthesis implants: implant design and resistance to local infection.

Infection is still a major complication associated with surgery in orthopedics and traumatology. The implant design, the implant material, and the implantation technique may play essential roles in preventing infection. The goal of this paper is to discuss a series of experiments evaluating different aspects of both surgical procedures and implants.

In vivo measurement of bending stiffness in fracture healing.

Background: Measurement of the bending stiffness a healing fracture represents a valid variable in the assessment of fracture healing. However, currently available methods typically have high measurement errors, even for mild pin loosening. Furthermore, these methods cannot provide actual values of bending stiffness, which precludes comparisons among individual fractures.

The effect of delayed autogenous bone grafting on the healing of diaphyseal defects in a canine model.

Bone grafting of osseous defects is often delayed to minimize the risk of infection, however, the effect of this delay on defect healing is not clear. Unilateral oblong unicortical diaphyseal femoral defects (30 x 4.5 mm) were created in 3 groups of 18 adult canines that were grafted with autogenous bone immediately, at 2 weeks, and at 6 weeks.

Evolution of the internal fixation of long bone fractures. The scientific basis of biological internal fixation: choosing a new balance between stability and biology.

The advent of 'biological internal fixation' is an important development in the surgical management of fractures. Locked nailing has demonstrated that flexible fixation without precise reduction results in reliable healing. While external fixators are mainly used today to provide temporary fixation in fractures after severe injury, the internal fixator offers flexible fixation, maintaining the advantages of the external fixator but allowing long-term treatment.