Time dependent human hip joint lubrication for periodic motion with stochastic asymmetric density function.
The present paper is concerned with the calculation of the human hip joint parameters for periodic, stochastic unsteady, motion with asymmetric probability density function for gap height. The asymmetric density function indicates that the stochastic probabilities of gap height decreasing are different in comparison with the probabilities of the gap height increasing. The models of asymmetric density functions are considered on the grounds of experimental observations. Some methods are proposed for calculation of pressure distributions and load carrying capacities for unsteady stochastic conditions in a super thin layer of biological synovial fluid inside the slide biobearing gap limited by a spherical bone acetabulum. Numerical calculations are performed in Mathcad 12 Professional Program, by using the method of finite differences. This method assures stability of numerical solutions of partial differential equations and gives proper values of pressure and load carrying capacity forces occurring in human hip joints.
Technical University of Koszalin, Institute of Technology and Education, Koszalin, Poland.
Krzysztof
K
Wierzcholski
D006621:Hip Joint / Q000502:physiology*; D006801:Humans; D008153:Lubrication; D008954:Models, Biological; D009716:Numerical Analysis, Computer-Assisted; D011336:Probability; D016059:Range of Motion, Articular / Q000502:physiology*; D013269:Stochastic Processes; D013997:Time Factors; D016474:Weight-Bearing