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Results for “HIP JOINT”

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At least 1,081 records · Page 60Linked to original sources
PubMed1989

[Dynamic angioscintigraphy and static scintigraphy of the hip joint in the complex diagnosis of Legg-Perthes disease].

The author has studied the peculiarities of the initial passage of an osteotropic radiopharmacologic drug along the femoral arteries and its distribution in the femoral head in 55 children with Perthes' disease and in 25 children with diseases and injuries of the hip joint with similar symptoms as well as in 22 children from the control group. In normal conditions the asymmetry of the drug distribution does not exceed +/- 10%. The presence of the drug hypofixation focus (the relative level being below 90%) in the upper pole of the femoral head associated with a reduction of the blood flow in the femoral artery on the affected side is typical for the early stage if Perthes' disease. These symptoms precede the appearance of the roentgenologic signs of the femoral head lesion.

Adolescent↗
PubMed1998

Hip joint prosthesis design: effect of stem introducers.

The stress levels in the femoral component of a total hip prosthesis (Corin Taper Fit, Corin Medical Ltd, Cirencester, Gloucestershire, UK) were calculated by finite element (FE) analysis. This prosthesis has two holes drilled in the shoulder to engage a stem introducer. There were no unacceptable stress levels around these holes. Instead the maximum stresses were around the periphery of the shaft of the stem, as has been observed for FE analyses of conventional designs. Three prostheses were also subjected to cyclic mechanical testing (peak load 2.3 kN) according to the appropriate British Standard. The holes were examined for cracks, before and after testing, by stereomicroscopy. All three specimens were able to withstand 5 million loading cycles with no evidence of damage. Thus it is possible to design a femoral component with holes in the shoulder, to accommodate a stem introducer, without creating unacceptable stress concentrations.

Computer Simulation↗
PubMed1998

Friction in hip-joint prostheses and its influence on the fixation of the artificial head.

The head of an implanted hip joint endoprosthesis is exposed to torques, which are transferred during gait due to the friction between the head and the cup prosthesis. In prostheses with ceramic ball heads, which are widely used now, and in which the head is fixed onto the stem by conical clamping, these torques could possibly affect the connection. In this study, torques transferred from the cup to the head are compared to the torques which are required to loosen the head from the metallic spigot. The results show that for the investigated head and taper types and sizes, under normal conditions the connection is safe with respect to undesired rotation. However, it is shown that for polluted sliding surfaces the fixation strength could possibly be exceeded.

Journal Article↗
PubMed1977

[The stress of the human hip joint. VII. The distribution of cartilage thickness in the acetabulum and its functional explanation (author's transl)].

The cartilage thickness of the human acetabulum was examined in 10 objects (material from the dissecting room). Cartilage specimens were taken at identical points of the joint and measured by microscope. The greatest thickness is situated in the outer joint edge, with a maximum in the frontal part of the joint roof; the lowest thickness is found at the inner margin of the facies lunata. These results indicate a higher stressing of the outer joint margin. This could be caused by an eccentric position of the hip joint's resultant force, which is shifted towards the edge. Another possible explanation of these results relates to a swelling of the joint cartilage under functional stress. Such a swelling, which has already been proved, would lead to an incongruence of the ball and socket joint, and so to a stronger stressing of the outer joint edge.

Acetabulum↗