الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
Revision total hip arthroplasty in the presence of major acetabularbonydefects especially pelvic discontinuity continues to constitute a great challenge and controversy. This incidence of such big defects is likely to increase with the increase of the number of total hip arthroplasty being performed every year.
- The success rate of reconstruction of AAOS type IIIdefects is good ( 85%) and comparable to the literature using other reinforcement rings and cages, trabecular metal and triflange cups
- Our results for the use of the Ganz reinforcement ring for reconstruction of type IV defects entails a high rate of failure (45%).
- Significantly lower failure rate (11-19%) reported for trabecular metal and triflange cups at comparable follow-up for reconstructing type IV defects (pelvic discontinuity). These implants maybefavorable for management of such severe defects.
- The incidence of complications was much higher in type IV then in typeIII.
- The most common complication was dislocation the aseptic loosening then septic loosening.
- Using the multivariate Cox regression statistical analysis, the following factors were found to significantly affect survival of the reconstruction: age, type IVdefect, duration of surgery, the presence of co-morbidities, and complications.
- The use of Ganz reinforcement ring for reconstructing acetabular defects in revision total hip arthroplasty is considered a successful method in comparison with other available methods especially in AAOS type IIIdefects.
- In case of pelvic discontinuity, other methods like tantalum cups and custom components are preferred.