Bridging massive acetabular defects with the Triflange Cup - 2- to 9-year results

An unresolved issue in total hip arthroplasty is acetabular reconstruction when there is bone loss that results in pelvic discontinuity, that involves radiation-compromised bone stock, or that is significant enough to exceed the limits of jumbo hemispherical cups. Achieving pain relief and initial a nd long-term implant stability on host bone are the major goals of this typ e of reconstruction. Seventy-eight hips in 76 patients in whom a large acet abular defect was bridged using a custom-designed, flanged component were r eviewed retrospectively. The preoperative deficiency was classified as a co mbined deficiency in 39 hips and as a pelvic discontinuity in the other 39 hips. Six patients died before a minimum 2 years followup. With five patien ts considered lost to follow,up, there were 67 hips in 65 patients with an average followup of 53 months (range, 24-107 months). No Triflange Cup has been removed. Harris hip scores improved from a preoperative mean of 33.3 p oints to a postoperative mean of 82.1 points. Radiographically there are tw o patients with incompletely healed discontinuities but both are asymptomat ic. Reoperation for recurrent dislocation occurred in six patients (7.8%). The Triflange Cup offers an alternative method of repair that reliably prov ides pain relief, initial implant stability, potential long-term implant st ability, and pelvic stability in cases of discontinuity.