Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Minimally Invasive Surgery - Hip
Abstract number: 26512
THE BIOACTIVE HYDROXYAPATITE COATED SL-PLUS TIHA MIA STEM IN MIS.
Gerald PFLUEGER
Orthopeadic Clinic, Vienna (AUSTRIA)
Aim of this study was to investigate the advantages of the bioactive coated SL-Plus
TiHA MIA stem in comparison to the uncoated SL-MIA stem for minimally invasive
THR. We examined a cohort of 576 patients after 6 to 12 month postoperatively (465
patients with the uncoated and 111 patients with the bioactive coated stem). Patients
were operated in supine position via MIS-approach (modified Watson Jones),
followed by early and full weight loading mobilization starting on the first
postoperative day. Follow-up included the clinical (HHS, VAS) and radiological
evaluation in terms of 6 weeks, 3 and 6 month and after one year. The main focus of
the radiological evaluation was osseointegration of the stem, axial migration and the
appearance of radiolucent lines. In both groups the clinical parameters (HHS,VAS)
showed no significant differences. Axial migration from 2 to 4 mm was nearly equal in
both groups. Over 5 mm we examined a remarkable difference in favour of the
coated group (uncoated: 5%; coated: 1%). Radiolucent lines (Gruen-zones) were
observed in only 0.9% of the coated group versus 23% in the uncoated. With the
introduction of the bioactive coated SL-Plus TiHA MIA stem in our department the
appearance of radiolucent lines became remarkable rare. The incidence of extreme
axial migration (>5 mm) declined. According to our results we expect that long-term
studies will also show a lower rate of aseptic loosening of the stem and increased
durability of the prosthesis. Statistical results will be presented.
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