Xiu-jun Zheng

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STUDY DESIGN Biomechanical cadaveric study. OBJECTIVE To determine the torque required to remove pedicle screws augmented with polymethyl methacrylate (PMMA) or calcium phosphate cement (CPC); thus, proving the safety of back out of augmented screws in the osteopotoric model, which would be a more dangerous setting than the nonosteoporotic model. (More)
STUDY DESIGN Prospective cohort evaluation of C7 plumb line (C7PL) and gravity line (GL) in different standing positions in asymptomatic volunteers. OBJECTIVE To evaluate the repeatability of C7PL and GL in different standing positions using an optical method. SUMMARY OF BACKGROUND DATA Both C7PL and GL have been used to assess spinal balance. However,(More)
OBJECTIVE To evaluate the biomechanics of lumbar motion segments instrumented with stand-alone OptiMesh system augmented with posterior fixation using facet or pedicle screws and the efficacy of discectomy and disc distraction. BACKGROUND CONTEXT OptiMesh bone graft containment system has been used for vertebral compression fractures and percutaneous(More)
The purpose of this experiment was to determine the stimulating and recording characters of fascicular physioelectrical signals in the activity of peripheral nerves by longitudinally implanted intrafascicular electrodes (LIFEs) in a rabbit sciatic nerve model, and discuss the future application of LIFEs in functional electrical stimulation (FES) and control(More)
Successful placement of cervical pedicle screws requires accurate identification of both entry point and trajectory. However, literature has not provided consistent recommendations regarding the direction of pedicle screw insertion and entry point location. The objective of this study was to define a guideline regarding the optimal entry point and(More)
By detection and analysis of neuro-information from amputee in experiments, a research on the correlations of three main nerves (median nerve, radial nerve and ulnar nerve), on the patterns for discharging information, and on the mechanics about how neuro-information dominates movements was performed. These researches would contribute to the development of(More)
OBJECTIVE To study the biocompatibility of longitudinally implanted intrafascicular electrodes (LIFEs) in a rabbit sciatic nerve model. And to discuss the possibility of peripheral fascicular signals as a new signal source to control an electronic prosthetic hand. METHODS LIFEs were implanted chronically into sciatic peripheral fascicles of rabbits as(More)
The aim of this study is to investigate the role of miR-9 and its mechanism on the osteoblast differentiation of mesenchymal stem cells. Real-time PCR and western blotting were used to study gene expression. Assay of Alkaline phosphatase activity and alizarin red staining were used to examine osteoblast differentiation. Transfection of miR-9 mimics or(More)
OBJECTIVE To construct an inducible lentivirus vector of FcγRIIB and observe its effect on rat macrophages. METHODS FcγRIIB gene fragment was obtained from rat liver mRNA as the template by reverse transcription PCR, and then cloned into tetracycline response element (TRE) plasmid to establish recombinant plasmid TRE-FcγRIIB. Lentiviral packaging plasmid(More)
BACKGROUND CONTEXT Salmonella vertebral osteomyelitis is a well-known complication of sickle cell disease. However, it has been infrequently reported in immunologically normal people or diabetic patients. PURPOSE To report a case of Salmonella vertebral osteomyelitis in a diabetic patient with multiple rib infections, large bilateral psoas muscle(More)