The optimal technique for acetabular revision surgery in the face of major bone stock deficiency remains controversial. One subset of these problem cases consists of hips that are amenable to reconstruction using a large, hemispherical cementless acetabular component, the so-called jumbo acetabular component. We report the intermediate-term experience of 24 hips in 24 patients who underwent an uncemented acetabular revision using a hemispherical acetabular component of > or = 66 mm diameter. In 16 hips, the femoral component was replaced as well. Of the 18 hips in patients alive after 5 years, 15 were assessed at a mean follow-up of 7.0 years (range, 5.0-10.3 years). The mean final Harris Hip Score was 86 points (range, 45-100 points). No acetabular component had been revised, and none were loose radiographically. In this difficult group, a bimodal distribution resulted. The complication rate was high. In those without infection, the results were excellent.