Cp. Delaunay et Ai. Kapandji, SURVIVORSHIP OF ROUGH-SURFACED THREADED ACETABULAR CUPS - 382 CONSECUTIVE PRIMARY ZWEYMULLER CUPS FOLLOWED FOR 0.2-12 YEARS, Acta orthopaedica Scandinavica, 69(4), 1998, pp. 379-383
We studied prospectively 382 cementless (Zweymuller stem) and hybrid (
cemented stem) primary total hip replacements and used a cementless gr
it-blasted titanium alloy threaded cup. After a median 5 (0.2-12)-year
follow-up, 1 cup was exchanged, 2 cups were removed for deep sepsis,
and 3 cups showed definite loosening; of these, 2 subsequently require
d revision. Actuarial calculation methods indicated a 10-year survivor
ship of 99% with cup retrieval for any cause (clinical failure), defin
ite cup-loosening (radiographic failure), and revision for aseptic cup
-loosening as endpoints, These intermediate results exceed those from
smooth-surfaced screw rings and compare favorably with those from ceme
nted cups and cementless, press-fit, metal-backed cups.