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Acetabular revision with a modular anti-protrusio acetabular component.
Christopher L Peters1, Michael Miller, Jill Erickson
1University of Utah Orthopedic Department, Salt Lake City 84132-2302, USA.
The Journal of Arthroplasty
|October 1, 2004
Summary
A new modular porous-coated anti-protrusio cage (MAPC) shows promising short-term results for acetabular revisions. This implant offers potential for bone ingrowth and improved surgical flexibility compared to traditional designs.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
- Medical Device Design
Background:
- Current anti-protrusio cages are typically non-porous-coated, one-piece designs.
- These limitations restrict bone ingrowth, intraoperative trial fitting, and modularity.
- This necessitates alternative solutions for complex acetabular revisions.
Purpose of the Study:
- To evaluate the short-term clinical outcomes of a novel, completely modular, porous-coated anti-protrusio component (MAPC).
- To assess the implant's survivorship, complications, and functional performance in acetabular revision surgery.
Main Methods:
- A prospective study involving 63 acetabular revisions using MAPC performed between 1998 and 2001.
- Patients with challenging bone defects (Paprosky type 3A/B) were included.
- Follow-up averaged 29 months, with clinical and radiographic assessment.
Main Results:
- 87% of MAPC implants remained in situ at a mean follow-up of 29 months.
- Complications included infection (4), loosening (3), malposition (1), and dislocation (8, requiring 6 reoperations).
- Two implants showed asymptomatic radiographic loosening.
Conclusions:
- The modular porous-coated anti-protrusio component demonstrates short-term efficacy comparable to conventional cages.
- Potential advantages include enhanced bone ingrowth, improved fixation, surgical adaptability, and modularity.
- MAPC offers a viable alternative for complex acetabular reconstructions.