[Treatment of thoracic and abdominal cavity perforation complicated by Henoch-Schonlein purpura nephritis in a patient with high-voltage electric burn].

A 55-year-old male patient suffered from severe high-voltage electric burn with an area of 20%TBSA full-thickness injury. The injury involved the distal end of left upper limb, right trunk, and whole abdominal wall. Fracture of the 7th-10th ribs was found in the right side of chest, with perforation of abdominal cavity, and bilateral pleural effusion was found.

Stress distribution on the screws in posterior lumbar fusion of isthmic spondylolisthesis with 2- or 3-vertebra fixation techniques: a biomechanical cadaveric study.

Background: Two- or three-vertebra fixation techniques are both used in the treatment of spondylolisthesis. However, the number of spinal segments that should be implanted in spondylolisthesis reduction and fixation is still controversial, and there are no published reports on stress distribution on the screws with 2- or 3-vertebra fixation techniques. Understanding stress distribution in screws would be of potential great clinical importance and supply more biomechanical evidence in surgery.

A study of low elastic modulus expandable pedicle screws in osteoporotic sheep.

Study Design: Low elastic modulus expandable pedicle screw (L-EPS) was inserted into osteoporotic sheep. Biomechanical tests, micro-CT analysis and histologic observation were performed.

Objective: To find out whether the L-EPS can further improve fixation strength compared to the expandable pedicle screws (EPS) in osteoporotic sheep spine.

Sustained-release rhBMP-2 increased bone mass and bone strength in an ovine model of postmenopausal osteoporosis.

Objective: The purpose of this study was to analyze the local treatment effects of rhBMP-2 combined with fibrin sealant (FS) on bone mineral density, microarchitectural and mechanical properties in osteoporotic ovine spine.

Materials And Methods: Postmenopausal osteoporosis was induced in eight sheep through ovariectomy (OVX) and a low-calcium diet for a period of 12 months. According to the Latin square design, L3-L6 vertebrae were randomly assigned to four treatment groups: A (rhBMP-2/FS), B (rhBMP-2), C (FS) and D (blank control).

A new method of partial screw augmentation in sheep vertebrae in vitro: biomechanical and interfacial evaluation.

Study Design: Partial screw augmentation was carried out by the injection of polymethylmethacrylate (PMMA) through the novel tap into the bone tissue in sheep vertebrae in vitro. Biomechanical tests and microcomputerized tomography analysis were done.

Objective: To evaluate the stability of the screw and the interface between the bone and the screw in partial screw augmentation.

Accuracy and safety assessment of pedicle screw placement using the rapid prototyping technique in severe congenital scoliosis.

Study Design: The application of rapid prototyping (RP) technique for improving accuracy of pedicle screw placement in congenital scoliosis is described in this study.

Objective: To compare the accuracy and safety of pedicle screw placement in congenital scoliosis using the RP technique versus the conventional fluoroscopy.

Summary Of Background Data: Maldeveloped vertebral components in congenital scoliosis leads to prolonged operation time and higher rate of screw misplacement.

Application of an expandable pedicle screw in the severe osteoporotic spine: a preliminary study.

Purpose: To investigate the clinical abstract and radiographic outcome of multi-axial expandable pedicle screws (MEPS) in patients with osteoporosis.

Methods: One hundred and twenty-five consecutive patients received MEPS from the UPASS spinal fixation system to obtain thoracolumbar or lumbosacral stabilization. All patients underwent bone mineral density (BMD) scans.

Expandable pedicle screw trajectory in cadaveric lumbar vertebra: an evaluation using microcomputed tomography.

Study Design: An in-vitro cadaver-based measurement using microcomputed tomography.

Objectives: To evaluate the safety of removal of expandable pedicle screws (EPSs) in human vertebral bodies after a long (6 mo) insertion time.

Summary Of Background Data: Transpedicular fixation is commonly used for posterior fixation of the spine.

Staged-injection procedure to prevent cement leakage during vertebroplasty: an in vitro study.

Background: Epidural leaks or canal intrusion are often found in vertebroplasty, which can lead to several complications. To the best of our knowledge, this is the first report on using two-stage injection procedure in vertebroplasty to reduce cement leakage rate.

Materials And Methods: Fifty cadaveric vertebrae (L1-L5) were harvested from 10 osteoporotic lumbar spines.

Augmentation of pedicle screw stability with calcium sulfate cement in osteoporotic sheep: biomechanical and screw-bone interfacial evaluation.

Study Design: Augmentation of pedicle screws with calcium sulfate cement (CSC) was performed in osteoporotic sheep. Biomechanical tests, micro-computed tomography (CT) analysis, and histological observation were performed.

Objective: To investigate the long-term biomechanical performance of pedicle screws augmented with CSC in vivo and evaluated the screw-bone interfacial bonding with micro-CT and histological techniques.

Effect of ovariectomy on BMD, micro-architecture and biomechanics of cortical and cancellous bones in a sheep model.

Osteoporotic/osteopenia fractures occur most frequently in trabeculae-rich skeletal sites. The purpose of this study was to use a high-resolution micro-computed tomography (micro-CT) and dual energy X-ray absorptionmeter (DEXA) to investigate the changes in micro-architecture and bone mineral density (BMD) in a sheep model resulted from ovariectomy (OVX). Biomechanical tests were performed to evaluate the strength of the trabecular bone.

Micro-CT evaluation and histological analysis of screw-bone interface of expansive pedicle screw in osteoporotic sheep.

Objective: To investigate the properties of screw-bone interface of expansive pedicle screw (EPS) in osteoporotic sheep by micro-CT and histological observation.

Methods: Six female sheep with bilateral ovariectomy-induced osteoporosis were employed in this experiment. After EPS insertion in each femoral condyle, the sheep were randomly divided into two groups: 3 sheep were bred for 3 months (Group A), while the other 3 were bred for 6 months (Group B).

Staged-injection procedure to prevent cement leakage during vertebroplasty: an in vitro study.

Study Design: Fibrin sealant (FS) combined with or without growth factor was used to improve the micro-architectural and biomechanical properties of vertebral body in osteoporotic ovine spine.

Objective: To analyze the treatment effects of bovine bone morphogenetic protein (bBMP) combined with FS on osteopenic ovine vertebral architecture, bone mineral density, and biomechanics in vivo.

Summary Of Background Data: Vertebroplasty and kyphoplasty were used to treat spinal osteoporosis.

[Micro-CT evaluation and histological analysis of screw-bone interface of expansile pedicle screw in osteoporotic sheep].

Objective: To investigate the properties of screw-bone interface of expansive pedicle screw (EPS) in osteoporotic sheep using micro-CT and histology.

Methods: Six female sheep with bilateral ovariectomy-induced osteoporosis were employed in this experiment and were randomly assigned into 2 groups: A and B. After EPS insertion in each femoral condyles, sheep in group A were bred for 3 months, while those in group B 6 months.