Methods Nighteen patients with atlantoaxial instability were treated by using new technique that nine of them were using the Apofix system, and nine others were combining use of the Apofix and the posterior atlantoaxial transarticular screw insertion;only one was using the individual fixation of the C 1 lateral mass and C 2 pedicle with Axis system.

Relative anatomical study of atlanto-occipital joint for posterior transarticular screw fixation;

Transarticular screws versus Magerl lateral mass screws:an anatomic comparison of their possible effects on injury to spinal nerve roots;

The study on the feasibility of posterior occipitoatlantoaxial transarticular screw fixation;

The applications of the bi-planar navigation robot system in tibia intramedullary nailing,femur intramedullary nailing,femoral neck cannulated screw and sacro-iliac screw are also introduced in terms of workspace,projecti.

Dynamic hip screw fixation with bone grafting for intertrochanteric femur fractures

AIM To discuss the effect and influence factor s operative of dynamic hip screw(DHS)internal fixation in treatment of intertrochanteric fracture.