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One of the most common spinal fractures is thoracolumbar spine fracture and in this area burst fracture contributed approximately 10%-20% of such spinal problems. The purpose of this study is to investigate biomechanical effects of anterior decompression and posterior instrumentation and evaluate the role of short-segment pedicle screw instrument in order to preservation of adequate spine stability...
Ligaments in the knee that connect the femur to the tibia are often torn during a sudden twisting motion, which results in instability in the knee. In such cases ligament repair surgery may be an effective treatment where the ligament involved is replaced with a piece of healthy tendon which is grafted into place to hold the knee joint together. A novel device for use in knee ligament repair surgery...
Osseointegration is critical for implant fixation, and mechanical stimuli play a role in this process. Our long term goal is to investigate the relationship between local mechanical environment and osseointegration. In this paper, as a first step in the study, we constructed an approximate 3D model of the in-vivo test and focused on calculating the strain fields around the implant. We first demonstrated...
The objective of this paper is to analyze the stress and displacement of the fracture of neck of femur after fixing with a new design screw. In particular, the finite element model of the proximal femur, which was developed for different material properties of compact bone and spongy bone, had been accurately solved by aids of these software- MIMICS and ANSYS. To simulate the environment of the fracture,...
Finite element model could be generated by computed tomography (CT) data set which provide accurate information about bone geometry and tissue density. In this work, an efficient approach for computing CT numbers for each element is presented. Mechanical properties of bone tissue can be estimated according to the relationship between tissue density and CT numbers. The experimental results show that...
In this paper, a biomechanical analysis method for percutaneous vertebroplasty has been presented. Integrating the anatomical structure from the spine CT images of a patient, a novel three-dimensional geometric model of lumbar functional spinal units (FSUs) has been built. Based on the geometric model, two kinds of three-dimensional finite element models (FEM) of L1-L2 segments for preoperative and...
To build a biomechanical human model can make much sense for surgical training and surgical rehearse. Especially, it will be more meaningful to develop a biomechanical model to guide the control strategy for the medical robots in HIT-Robot Assisted Orthopedic Surgery System (HIT-RAOS). In this paper, based the successful work of others, a novel reliable finite element method based biomechanical model...
To build a biomechanical human model can make much sense for surgical training and surgical rehearse. Especially, it will be more meaningful to develop a biomechanical model to guide the control strategy for the medical robots in HIT-Robot Assisted Orthopedic Surgery System (HIT-RAOS). In this paper, based the successful work of others, a novel reliable finite element method based biomechanical model...
There is a novel method for creating a 2-d parameterized finite element model of the human femur with matching artificial hip joint based on X-ray image before the hip joint replacement surgery. It can help us to evaluate the selected appropriate hip joint prosthesis
In this study a three dimensional finite element model was established to analyze the interfacial stress distribution in the osseointegrated transfemoral prosthesis. The effects of implant length and screw pitch on the stress and strain distributions were analyzed in terms of bonded and contact bone-implant interfaces. The influences of the contact parameters, contact stiffness and friction coefficient,...
A three-dimensional accurate foot model including bones, cartilages, ligaments and tendons was developed from 3D reconstruction of CT images. The model was used to analyze stress-strain of the joint between the first metatarsal and the medial cuneiform and to study the relationship of the range of motion of the first ray and hallux valgus
For children with cleft palate, oral function is impaired. The hypothesis is that the stress and strain distribution within the affected maxilla with a cleft during functional tasks such as biting and chewing is abnormal and can significantly affect bone development in the growing child. To test this hypothesis, a three-dimensional finite element model of a pediatric subject-specific maxilla with...
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