Izvorni znanstveni članak
Investigation of Hip Joint Prosthesis Damage
I. Dovžak Bajs
V. Šarić
M. Opalić
Sažetak
Following total hip arthroplasty the durability of a prosthetic implant depends on
many factors but is generally limited by two types of damage: wearing of frictional surfaces
of the acetabular and femoral component as well as the loosening and migration of
the »prosthesis-cement-bone« system. Since it is possible to establish a cause-and-effect
relationship between these two damage types, the aim of this research is to investigate
the phenomena related to the contact surface and their influence on the prosthesis-bone
relationship in general for various sizes and conditions of loading of the hip joint. The
experimental study was conducted using a Timken testing device1 modified in such a
way that simulation of relative movements of the joint elements was achieved using a
mechanism that produces conditions similar to those in the human hip joint. The analysis
of obtained measurements showed that actual radii of friction of the hip prosthesis
did not correspond to the theoretical ones and that only a small portion of the total friction
surface is realized. Variations of the radius of friction for the examined prosthesis
type were very large, which changes the hypotheses on the ability of the prosthetic head
and the »prosthesis-cement-bone« system to bear a certain amount of load2. The construction
and design of prosthetic implant components has a significant influence on
both the amount of wear at the site of contact and the loosening of prosthesis.
Ključne riječi
Hrčak ID:
28334
URI
Datum izdavanja:
18.6.2001.
Posjeta: 788 *