Cp. Delaunay et Ai. Kapandji, PRIMARY TOTAL HIP-ARTHROPLASTY WITH THE KARL-ZWEYMULLER FIRST-GENERATION CEMENTLESS PROSTHESIS - A 5-YEAR TO 9-YEAR RETROSPECTIVE STUDY, The Journal of arthroplasty, 11(6), 1996, pp. 643-652
A consecutive series of 72 primary total hip arthroplasties were perfo
rmed in 70 patients using the first-generation Zweymuller cementless t
itanium press-fit femoral and threaded acetabular components (AlloPro,
Baar, Switzerland). Twelve hips were excluded from the study because
of insufficient follow-up evaluation, including one patient who underw
ent a socket revision within the first 2 weeks. Sixty total hip arthro
plasties with an average follow-up period of 80 months (range, 60-108
months) were retrospectively reviewed. Clinical results were graded ex
cellent or good in 54 cases (90%), fair in 3 (5%), and poor in 3 (5%)
with 2 early implant failures (1 acetabular cup and 1 femoral stem in
2 hips). Cumulative survival rates at the 6- to 7-year interval, with
failure defined as revision and/or loosening are 98.47% (SD, 2.0%) for
the femoral component (1 single septic and loose stem, revised at 5 y
ears), 97.08% (SD, 2.72%) for the screw ring (2 unstable but only 1 re
vised), and 95.56% (SD, 3.36%) for both components. This encouraging e
xperience with the first-generation prosthesis supports the rationale
for continued use of the new Zweymuller Alloclassic stem and open-back
screw ring available since 1988.