Xiu-jun Zheng

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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)
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)
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)
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)
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)
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)
STUDY DESIGN In vitro biomechanical study evaluating the effect of fusion levels on simulated S1 screws on calf spines. OBJECTIVE To measure the stresses of simulated S1 screws as a function of increasing fusion levels in long-fusion construct. SUMMARY OF BACKGROUND DATA Extension of long fusion to sacrum remains a difficult clinical challenge despite(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)
The purpose of this experiment was to study the recording and stimulating properties, and biocompatibility of longitudinally implanted intrafascicular electrodes (LIFEs) in a rabbit sciatic nerve model when they were chronically implanted into peripheral fascicles. LIFEs were implanted chronically into sciatic nerve fascicles of rabbits as recording and(More)
OBJECTIVE To compare the clinical efficacies of single segment transforaminal lumbar interbody fusion (TLIF) with cage versus autogenous morselized bone for degenerative lumbar spinal stenosis. METHODS A total of 87 patients undergoing single segment TLIF were randomly divided into 2 groups. A cage was implanted into intervertebral space in group A(More)