Avtor/Urednik		Ipavec, Marija
Naslov		Matematični model porazdelitve napetosti v kolčni sklepni plasti med hojo
Tip		monografija
Kraj izdaje		Ljubljana
Založnik		Fakulteta za elektrotehniko
Leto izdaje		2002
Obseg		str. 79
Jezik		slo
Abstrakt		In this work we developed the mathematical model of distribution of compressive stress in the articular layer of the human hip during gait for known resultant hip joint force R, which is determined separately. The model equations can be solved almost completely analitically and are useful for any direction of resultant hip joint force. In the model the cartilage was described as a homogenous elastic continuum with constant thickness in the unloading state. Because of very small frictional force the tangential stress in the articular layer of human hip is negligible compared with the stress in radial direction. For that reason we considered only the stress in the radial direction. This assumption can be justified when the femoral and acetabular shell are congruent. To determine the function which may approximate the distribution of compressive stress sigma in the articular layer of the human hip, we assumed that the femoral head and the acetabular shell are shaped as rotational ellipsoids. In special case, when the femoral head and the acetabulum are spherical, the dependence sigma = sigma0cosgamma is recovered, where sigma0 is a constant and -gamma is the angle between the pole and the point of the observation. We calculated that the maximal stress in stance period is 2 MPa for normal values of the radius of the femoral head r, Wiberg angle thetaCE and body weight WB. (Abstract truncated at 2000 characters).
Deskriptorji		HIP JOINT WEIGHT-BEARING GAIT BIOMECHANICS MODELS, THEORETICAL