DOS 2017

122

· DOS Abstracts

Custom Triflanged Implant in Reconstruction of Severe

Acetabular Bone loss and Pelvic discontinuity after To-

tal Hip Arthroplasty.

Nikolaj Winther, Michael Mørk Petersen, Poul Torben Nielsen, Jens Stürup

Department of Orthopaedic Surgery, Rigshospitalet, University of Copenhagen;

Deptment of Orthopaedic Surgery, Aalborg University Hospital; Department of

Orthopaedic Surgery, Rigshospitalet, University of Copenhagen

Background:

Revision of a failed total hip arthroplasty (THA) with massive ac-

etabular bone loss and pelvic discontinuity is a reconstructive challenge. Treat-

ment options includes morselized bone graft and structural allograft used with

uncemented hemispherical acetabular components, cages, porous metal aug-

ments, and cup- cage reconstruction.

Purpose / Aim of Study:

The purpose of this study was to evaluate the use of

a new custom-made triflanged implant for acetabular reconstruction.

Materials and Methods:

We reviewed 31 patients, mean age 63.7 (48-86)

years) with a failed THA and severe bone loss or pelvic discontinuity, that un-

derwent revision THA from 2010 to 2017. Mean follow-up was 44 (10-84)

months. The implant for acetabular reconstruction was custom- manufactured

from Zimmer Biomet on the basis of a three-dimensional model of the hemi-

pelvis created from computed tomography (CT). Preoperative radiological eval-

uation was made by x-ray and CT-scan and postoperative evaluation by x-ray.

The Harris Hip score was performed and the acetabular bone defects were all

classified as type IV/V according to the Gross classification.

Findings / Results:

The mean outer diameter of the cup was 56 (52 to 62)

mm. No significant intraoperative complications occurred. Mean Harris Hip score

was 81 (68-97). Survivorship defined by implant failure was 100% Twenty-

eight patients (90%) were free of revision. Four patients experienced disloca-

tion (12%), two treated with a constrained liner. One re-infection (3%) revised

and treated with life-long antibiotic.

Conclusions:

The Custom made triflange implant for pelvic discontinuity pro-

vides a stable and rigid fixation on host bone with overall low early revision rate.

No conflicts of interest reported

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