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Published on: September 7, 2022
Periacetabular reconstruction with a new endoprosthesis.
Lawrence R Menendez1, Elke R Ahlmann, Yuri Falkinstein
1Department of Orthopedics, Keck School of Medicine, University of Southern California + Los Angeles County Medical Center, USC University Hospital, 1510 San Pablo Street, Suite 634, Los Angeles, CA, 90033, USA.
The periacetabular reconstruction (PAR) endoprosthesis shows improved stability and longevity for Type II pelvic resection compared to older models. This novel implant offers better function and reduced complications, enhancing patient outcomes in complex pelvic reconstructions.
Area of Science:
- Orthopedic surgery
- Reconstructive surgery
- Biomedical engineering
Background:
- Type II pelvic resections present significant reconstructive challenges.
- Existing methods often lead to graft/implant failure, pain, poor function, and high complication rates.
Purpose of the Study:
- To evaluate the efficacy and safety of the periacetabular reconstruction (PAR) endoprosthesis for Type II pelvic resection.
- To compare the outcomes of PAR endoprosthesis with the Mark II saddle endoprosthesis in the literature.
Main Methods:
- Retrospective review of 25 patients undergoing Type II pelvic resection and reconstruction with the PAR endoprosthesis.
- Analysis of patient function (MSTS score), complications, and implant survivorship.
- Comparison with historical data for the Mark II saddle endoprosthesis.
Main Results:
- The PAR endoprosthesis demonstrated an average MSTS score of 67%.
- Major complications occurred in 56% of patients.
- Implant survivorship was 84% at 2 years and 60% at 5 years, with lower ilium-saddle interface failure rates than the Mark II.
Conclusions:
- The PAR endoprosthesis is recommended for reconstructing large defects after Type II pelvic resection.
- Its modified saddle design offers improved stability, faster rehabilitation, and better longevity.
- The PAR represents an advancement over existing saddle prostheses for pelvic reconstruction.
