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Outcomes of Modular Knee Arthrodesis for Challenging Periprosthetic Joint Infections
Alexandra I Stavrakis1, Erik N Mayer1, Sai K Devana1
1Department of Orthopaedic Surgery, University of California Los Angeles, Los Angeles, CA, USA.
Background:
Modular knee arthrodesis (MKA) is a salvage treatment option for patients with challenging periprosthetic joint infections (PJI). The purpose of this study was to investigate the outcomes of patients who underwent MKA for PJI with a single technique and determine if specific factors are associated with MKA failure.
Methods:
This was a retrospective review of 81 patients who underwent MKA at a single institution. Knee Society Scores were recorded before MKA and at the final follow-up (mean 52 months). Poisson regression was used to calculate rate ratios for MKA failure secondary to infection.
Results:
The mean patient age was 67 years; most patients were McPherson B hosts (56.8%) and had type 3 extremities (53.1%), and all had a type III infection (chronic, >4 wks). Forty-six percent of patients had a prior explantation (59.5% failed 2-stage, 40.5% failed spacer). Staphylococcus epidermidis and Staphylococcus aureus were the most common organisms, 22.2% and 18.5%, respectively. Thirty percent of patients had at least one reoperation, excluding reimplantation (14.8% irrigation and debridement/wound closure, 9.9% MKA exchange, and 7.4% amputation). Of 82.7% of MKA patients with no evidence of infection, 82.1% (56 patients) underwent reimplantation endoprosthetic reconstruction, and 67.3% of these remained infection-free at the final follow-up.
Discussion:
MKA is a salvage option for challenging PJI cases that may serve as definitive surgical management or as a bridge to endoprosthetic reconstruction for patients who have failed prior infection control procedures.
Insights
Modular knee arthrodesis (MKA) is a salvage treatment for periprosthetic joint infections (PJI). This study found MKA can be definitive or a bridge to reconstruction, with many patients remaining infection-free after further procedures.
Area of Science:
- Orthopedic Surgery
- Infectious Disease
- Arthroplasty
Background:
- Periprosthetic joint infection (PJI) presents significant challenges in knee arthroplasty.
- Modular knee arthrodesis (MKA) serves as a critical salvage procedure for complex PJI cases.
- Understanding MKA outcomes is vital for optimizing treatment strategies.
Purpose of the Study:
- To evaluate the outcomes of modular knee arthrodesis (MKA) in patients with challenging periprosthetic joint infections (PJI).
- To identify factors associated with MKA failure in the context of PJI.
- To assess the efficacy of MKA as a definitive treatment or a bridge to further reconstruction.
Main Methods:
- Retrospective review of 81 patients undergoing MKA for PJI at a single institution.
- Analysis of Knee Society Scores pre-MKA and at mean 52-month follow-up.
- Poisson regression to determine rate ratios for MKA failure due to infection.
Main Results:
- The study included patients with chronic PJI (type III), often with prior explantation failures.
- Common pathogens included Staphylococcus epidermidis and Staphylococcus aureus.
- While 30% required reoperation, 82.7% achieved infection control, with 67.3% remaining infection-free after subsequent endoprosthetic reconstruction.
Conclusions:
- Modular knee arthrodesis (MKA) is a viable salvage option for severe periprosthetic joint infections (PJI).
- MKA can function as definitive management or a successful bridge to endoprosthetic reconstruction.
- Successful outcomes are achievable even in complex cases with prior treatment failures.
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