As is probably the case with all successful innovations, the unique
design of the thrust plate prosthesis (TPP) was not born of a
sudden fancy for a radically different hip joint replacement, but
emerged from elaborate biomechanical investigations on the
loosening of conventional, intramedullarly anchored hip prosthesis
shafts. In the 1970s, hip revisions due to loosening of the
prostheses became a burden to patients not only physically and
psychologically but also economically. This meant that it also
became a matter of daily concern to the orthopaedic surgeon, who
then had to cope with new, previously unknown problems. Loosening
processes were de tected within 5 years of implantation in up to
25% of cases. While implant loosenings were considered to be the
result of incorrect handling of materials, we felt that a number of
details still had to be considered in regard to the behavior of the
entire bone-prosthesis complex and the action of mechanical forces.
General
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