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Showing 2 results for Articular Cartilage

Behrooz Sepehri, Hojat Mohammadi Esfahani, Faramarz Firouzi,
Volume 16, Issue 8 (10-2016)
Abstract

Mechanical behavior of articular cartilage is affected by many factors. Inhomogeneous distribution of proteoglycans and collagen fibers through the thickness causes some depth-wise behavior. Mechanical properties directly affect stress and deformation of the tissue. In previous studies complexities and variation in mechanical properties were ignored. The aim of the present study is to create a model close to real anatomy of articular cartilage in knee joint and to simulate its behavior under dynamic gate in the stance phase. A 3D finite element (FE) model was created. It was constructed considering femur and tibial cartilages as well as medial and lateral meniscus. In the FE model, a nonlinear isotropic viscoelastic material model used for cartilages and a linear anisotropic elastic one was chosen for meniscuses. As well, cartilages assumed saturated . Numerical simulations on the model showed that peak of maximum principal stress occurred in superficial layer. It was decreased through thickness. These expressed why osteoarthritis fall out in the exterior layers such superficial . The present study showed that hydraulic permeability variation in cartilage as a strain-dependent variable was negligible in dynamic loading. Also, results had a good agreement with experimental ones

Volume 23, Issue 3 (7-2020)
Abstract

Osteoarthritis is the most common articular disease that has significantly affected the patients’ quality of life. As cartilage doesn’t have any blood vessels and neurons, its treatment is a difficult task to do. Traditional therapeutic approaches, including the use of non-steroidal anti-inflammatory drugs (NSAIDs) and surgical interventions, can only control the disease, and the joint will lose its functionality after a short period. Consequently, modern methods such as cell therapy and tissue engineering along with using various biomaterials are being attempted to repair degenerated cartilage tissue. Using interfering RNAs is another approach that targets specific destructive or malfunctioned RNA sequences and suppresses the responsible factors for cartilage tissue destruction. Hence, the degenerated tissue can gradually retain the balance between anabolic and catabolic activities. Identification of the affecting genes in degeneration or malfunctioning and their suppression has provided promising results for the treatment of diseases. In the current study, after introducing the tissue, the process of cartilage degeneration and osteoarthritis development, the researches that have investigated the effect of interfering RNAs on rehabilitating cartilage tissue via inhibition of cartilage matrix destruction are reviewed.


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