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Wall stress analysis of abdominal aortic aneurysms is a novel tool that has proven high potential to improve risk stratification of abdominal aortic aneurysms (AAAs). Wall stress analysis is based on computed tomography (CT) and magnetic resonance imaging, however, 3D ultrasound (US) has not been used yet. In this study, the feasibility of 3D US based wall stress analysis is investigated and compared...
Create a biological modeling of human lower limb is a difficult job due to the complex and irregularity skeleton structure. However, rebuilding the model that can be used to calculate the biomechanics characteristic is the key step to research the human body. Reverse engineering should be used in rebuilding model. The model consists of at least lower limb skeleton and joint cartilage. Cartilage is...
This article established the pelvis models with aeolotropic material property, and made modeling and mechanical analysis of the acetabular transverse fracture models treated with different internal fixation methods. The mechanical indexes we interested in are as follows, the maximal displacement, the maximum equivalent stress and the maximum stress around the fracture line. Through the compare of...
The artificial prosthesises currently used are only different in the femoral head size, neck length and stem thickness, but there is not any individualized prosthesis. At present, prosthesis looseness is the main problem of artificial femoral replacement, and individual matching level of joints is the bottleneck of restricting prosthesis replacement surgery. If we can design and produce corresponding...
Growth rate of abdominal aortic aneurysm (AAA) is thought to be an important indicator of the potential risk of rupture. Wall stress is also thought to be a trigger for its rupture. However, stress change during the expansion of an AAA is unclear. Forty-four patients with AAAs were included in this longitudinal follow-up study. They were assessed by serial abdominal ultrasonography and computerized...
Object: There are several therapies for rupture of long head of biceps tendon, including biceps tenotomy. However, there is still a disagreement on it, because this procedure may change thebiomechanical properties of shoulder and lead to degeneration of rotator cuff. The purpose of this study is to determine the change of stress and strain on shoulder with or without biceps tendon when the joint is...
Previous studies have not produced a comprehensive description of the nonlinear hyperelastic stress-strain behavior of the periodontal ligament (PDL) of impacted tooth. In the present study, a simulation was applied to get the stress distribution in the PDL of impacted tooth. Firstly, a novel finite element modeling method for the PDL of impacted tooth based on CT image and reverse engineering was...
The knowledge of the wall stress distribution in an intact abdominal aortic aneurysm (AAA) is required for assessing its risk of rupture. By simulation three dimensional (3D) models of AAA are usually generated in order to estimate the stress distribution. To evaluate the effects of wall thickness on AAA model reconstruction and stress distribution, herein we created and compared two 3D models of...
Spine curvature and posture are important to sustain healthy back. Incorrect spine configuration can add strain to muscles and put stress on the spine, leading to low back pain (LBP). We propose new method for analyzing spine curvature in 3D, using CT imaging. The proposed method is based on two novel concepts: the spine curvature is derived from spinal canal centerline, and evaluation of the curve...
Background: Treatment of malignant tumors of the pelvis, especially in the periacetabular region continues to present one of the most challenging problems in oncological and orthopedic surgery. Even now, hindquarter amputation is still the only choice for some patients, but hindquarter amputation can cause much trouble in sitting, standing and in fitting the exoprosthesis of patients after amputation,...
Rupture of abdominal aortic aneurysm (AAA), having a mortality rate of 50-75%, ranks as the 13th leading cause of death in the US. The ability to reliably predict the risk of rupture of AAA on a patient-specific basis could vastly improve the clinical management of these patients. Computed tomography scans of patients that arrived at Stony Brook University Hospital emergency room, with contained ruptures...
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