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Hip joint lubrication after injury in stochastic description of optimum standard deviations

Wierzcholski K. Ch.

Acta of Bioengineering and Biomechanics

2005

Vol. 7, nr 2

51-79

The lubrication parameters of rough and used cartilage surface in human hip joint changes suddenly after its injury. Stochastic changes of the roughness of the surfaces of the head of bone and stochastic changes of the load imply the random changes of gap height. Hence, the pressure distributions and capacity as well as friction forces and friction coefficients radically decrease or increase in several microseconds after trauma. These changes are very difficult to measure, hence an appropriate numerical research in this field is very important. In order to obtain correct numerical results, we have to perform calculations using stochastic description with optimum standard deviations.