Using the unilateral pedicle screw fixation was thought to decrease the stiffness of the fixed segments. Various prospective, randomized studies were performed to determine whether unilateral pedicle screw fixation provides the necessities of bilateral fixation in one- or two-segment lumbar spinal fusion. In this study, four different unilateral pedicle screw fixation systems were evaluated to ...

OBJECTIVE To determine the initial resistance of fixation using the Rigid Fix(®) system, and compare it with traditional fixation methods using metal interference screws; and to evaluate the resistance of the fixation with the rigid fix system when the rotational position of the bone block is altered in the interior of the femoral tunnel. METHODS forty ovine knee specimens (stifle joints) wer...

We present a rare clinical case of a 90-year-old female who sustained a proximal femoral neck fracture following long-standing hip arthrodesis. Since the fracture occurred relatively proximally and involved the pelvis, double-plate fixation was chosen to achieve rigid fixation. The reconstruction plate was placed at the posterior and anterior columns individually through single vertical incisio...

Semi-rigid plates have been constructed from epoxy resin reinforced with carbon fibre. These have been used in animal trials and also for internal fixation of 20 fractures of the human tibia. The results are generally very satisfactory, and support the view that semi-rigid fixation is not only desirable theoretically, but also works in practice. However, the results are from preliminary trials ...

This case report describes the repair of a complete sternal dehiscence of the lower right sternum using sternal wires, manubrial plates, and a Talon closure device for rigid, multidimensional sternal fixation. Sternal dehiscence is a rare but significant cause of morbidity for patients undergoing median sternotomy. The risk factors for this complication are well described and although sternal w...

Several articles have been written on the use of intraoral vertical subcondylar or inverted “L” osteotomies. le4 Although these procedures have been popular with surgeons to set the mandible back, a disadvantage is the necessary use of maxillomandibular fixation for 6 to 12 weeks. Paulus and Steinhauser’ have described lag screw fixation of vertical subcondylar osteotomies. However, they noted ...

OBJECTIVE To evaluate condylar head remodeling after mandibular set-back sagittal split ramus osteotomy (SSRO) with rigid fixation in skeletal class III deformities. The correlation between condylar head remodeling and condylar axis changes was determined using cone-beam computed tomography (CBCT) superimposition. METHODS The CBCT data of 22 subjects (9 men and 13 women) who had undergone man...

BACKGROUND Tracking eye position is vital for behavioral and neurophysiological investigations in systems and cognitive neuroscience. Infrared camera systems which are now available can be used for eye tracking without the need to surgically implant magnetic search coils. These systems are generally employed using rigid head fixation in monkeys, which maintains the eye in a constant position an...