Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 26598
FIFTEEN YEARS FOLLOW-UP WITH A SHORT PROSTHESIS WITH LATERAL
FLARE AND CIRCUMFERENTIAL LOAD DISTRIBUTION
Francesco SANTORI 1 , Piero PICIOCCO 2 , Nicola SANTORI 3
1 Osp.S.Pietrofbf, Rome (ITALY), 2 Clinica Ortopedica, Rome (ITALY), 3 Rome
American Hospital, Rome (ITALY)
Implant fixation with a valid periprosthetic bone ingrowth is not the unique
requirement for a good result. Periprosthetic bone stock preservation and a
physiological transfer of the load are fundamental requirements for the longevity of
the implant also in view of apossible future revision. For 15 years we began to use a
new type of stemless prosthesis with a well defined lateral flare. This stem was born
following the Fetto’s, Gallinaro’s, studies that showed that, taking in account not
only the load stresses on the bone but also the muscular forces, compressive
stresses are distributed also in the in lateral part of the proximal femur. Walker
confirmed that in an implant with a lateral support all the stress is transmitted
proximally, no load is transferred by the stem. This implant with a pronounced lateral
flare was realized as a custom made implant the first time in 1995.
In 2005, a standard implant with the same features as Custom Made type, (the
Proxima hip) came to be. In this paper we present clinical results obtained by the
author on over 500 patients of age varying between 30 and 91 years. Such results
have been remarkably good, only two septic revisions where required, no cases of
thigh pain ever reported. Radiographic imaging has consistently shown absence of
stress shielding and evidence, at one year, of strengthening in progress of the
trabecular bone around the implant with better periprosthetic bone stock that is
demonstrated also in DXA longitudinal studies.
115