Written in English
The purpose of this study is to explain why opposing cartilage surfaces in synovial joints do not wear, particularly under sustained loading. A new hypothesis, termed the immobile hyaluronic acid model, is developed to explain the loading problem and the role of hyaluronic acid in joints. In this model, the hyaluronic acid chains form an entangled immobile network spanning the gap between cartilage surfaces. During a squeezing motion, water and other solutes flow through this network, which significantly retards the outward flow and therefore the squeezing rate. An analysis is carried out, deriving the squeezing behaviour of a fibrous porous material between two parallel discs and a disc and parabolic surface, and the effect of relevant physiological parameters on the time for opposing surfaces to contact is studied. Under physiological conditions, cartilage contacts in 10 to 11 hours depending on whether additional solutes become trapped within the hyaluronic acid network.
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Synovial Joints and Lubrication mechanisms Neelam Singh Department of Mathematics Bundelkhand College, Jhansi(U.P.), India. Synovial joints form the most important feature of the human body as they represent the centers of the most essential and basic activity in the human beings, which is motion. The cartilage found on the surfaces of the body's joints is filled with synovial fluid, a liquid with a consistency similar to egg white. Synovial fluid makes up about 80 percent of cartilage's volume, and plays an essential role in supporting weight and lubricating joints. Since cartilage is porous, synovial fluid leaks out its holes every day. Various lubrication mechanisms proposed for synovial joints in the literature are presented. Current research focuses on the lubrication of synovial joints are reviewed, in particular on the effect of biphasic load support of articular cartilage as well as future directions on integrated tribological by: 3. A mixture model of synovial fluid filtration and synovial gel formation at normal approach of cartilage surfaces in the human synovial joints loaded by a compressive force has been recently presented in Parts I and II of this paper (Hlavácek, , J. Cited by:
Learn term:synovial membrane = lines & lubricates joints with free interactive flashcards. Choose from different sets of term:synovial membrane = lines & lubricates joints flashcards on Quizlet. Abstract. Lubrication is the action of attenuating friction between two bodies by interposing a fluid between them. Joint lubrication depends on the nature, form, and rheological properties of articular surfaces, as well as the lubricant, and the combined movement and forces—a set of parameters which are not yet completely : J. P. Renaudeaux. Joints are formed as a connection between any two bones. The type created during embryogenesis depends on the function to be performed. Three types of joints are found in the human body; they vary by the amount of relative motion they allow. 1 Diarthrodial or synovial joints, such as the hip and knee, are capable of large amounts of motion.. Synarthroses or Cited by: 1. Joint - Joint - The synovial fluid: The main features of synovial fluid are: (1) Chemically, it is a dialyzate (a material subjected to dialysis) of blood plasma—that is, the portion of the plasma that has filtered through a membrane—but it contains a larger amount of hyaluronic acid than other plasma dialyzates. (2) Physically, it is a markedly thixotropic fluid—that is, one that is.
SYNOVIAL fluid has interesting rheological properties. In normal animal and human joints, synovial fluid is highly viscous and non-Newtonian in that its . A synovial joint, also known as diarthrosis, joins bones with a fibrous joint capsule that is continuous with the periosteum of the joined bones, constitutes the outer boundary of a synovial cavity, and surrounds the bones' articulating surfaces. The synovial cavity/joint is filled with synovial joint capsule is made up of an outer layer, the articular capsule, which keeps FMA: Figure 1. Different types of joints allow different types of movement. Planar, hinge, pivot, condyloid, saddle, and ball-and-socket are all types of synovial joints. Planar joints have bones with articulating surfaces that are flat or slightly curved faces. These joints allow for gliding movements, and so the joints are sometimes referred to as. Start studying A & P Review 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. acting as a shock absorber between joints. Periosteum. A tough, thin membrane covering long bones. provides joint lubrication and dissipates compressive forces for joints. The three classifications of joints in the body.