Surgeon Volume Doesn’t Impact TKA Infection Risk, Study Finds

The focus on comprehensive infection control protocols, rather than surgeon experience alone, appears to be a key driver in minimizing post-operative infections following total knee arthroplasty (TKA), according to research presented at the American Academy of Orthopaedic Surgeons (AAOS) Annual Meeting in New Orleans earlier this month. The findings challenge the long-held belief that higher surgeon volume directly translates to lower infection rates in this common orthopedic procedure.

Beyond Volume: A Multifaceted Approach to Infection Prevention

Researchers at Hospital for Special Surgery retrospectively analyzed data from over 33,700 primary TKA procedures performed between January 2018 and December 2024. The study, led by Geoffrey H. Westrich, MD, FAAOS, categorized surgeons based on their annual TKA case volume – low (under 50 cases), high (50-250 cases) and ultra-high (over 250 cases). Surprisingly, the analysis revealed no statistically significant difference in rates of superficial surgical site infections or periprosthetic joint infections (PJI) across these volume groups, despite variations in surgical duration. Healio reports on the findings.

“Surgeon volume at our institution was not predictive of periprosthetic joint infection and superficial surgical site infection,” Dr. Westrich explained. “It was all of our infection prevention work that is done through the Infection Control Committee and everything we do while the patient is in the hospital.” This suggests that a robust, hospital-wide infection prevention program—encompassing patient assessment, preparation, and meticulous surgical protocols—is more impactful than individual surgeon experience.

Modifiable Risk Factors and Patient Optimization

The study highlighted the importance of addressing modifiable patient risk factors. Researchers found that interventions like smoking cessation counseling, optimized diabetes management, and weight loss programs for obese patients were significantly associated with reduced infection risk. This underscores the need for a holistic approach to patient care, extending beyond the surgical procedure itself.

Effective infection control measures within the hospital setting too played a crucial role. These included stringent wound sterilization techniques, careful staff training, minimizing traffic in operating rooms, and a dedicated infection control program. These elements, when implemented consistently, appear to be the primary determinants of post-TKA infection rates, according to the research team.

Understanding Periprosthetic Joint Infection (PJI)

PJI is a serious complication following joint replacement surgery. It occurs when bacteria infect the area around the new joint, leading to pain, swelling, and potentially requiring further surgery to remove the infected implant. The Mayo Clinic provides detailed information on PJI, including symptoms, causes, and treatment options. Superficial surgical site infections, while less severe, can still delay recovery and require antibiotic treatment.

Study Details and Limitations

The retrospective nature of the study is an important consideration. Retrospective studies analyze existing data, which can be subject to biases and confounding factors. While the large sample size (over 33,000 patients) strengthens the findings, it’s crucial to acknowledge that the results may not be generalizable to all healthcare settings. The study was presented at the AAOS Annual Meeting and further peer-reviewed publication is pending, which will provide a more detailed assessment of the methodology, and results. The abstract of the study is available through Healio.

Implications for Hospitals and Surgical Practices

The findings have significant implications for hospitals and orthopedic surgical practices. Rather than solely focusing on recruiting high-volume surgeons, institutions should prioritize investing in comprehensive infection prevention programs. This includes allocating resources to staff training, implementing evidence-based protocols, and optimizing patient care pathways to address modifiable risk factors.

The emphasis on a “robust program” as described by Dr. Westrich suggests a multi-layered approach. This could involve enhanced environmental cleaning protocols, improved surgical instrument sterilization techniques, and the apply of antimicrobial coatings on implants. Proactive patient education regarding post-operative wound care and early signs of infection is essential.

What Comes Next: Ongoing Surveillance and Protocol Refinement

Continued surveillance of TKA infection rates is crucial to monitor the effectiveness of implemented infection prevention strategies. Hospitals should regularly analyze their data to identify trends and areas for improvement. The findings from this study will likely prompt further research into the specific components of effective infection prevention programs, as well as the development of standardized protocols for TKA surgery. The American Academy of Orthopaedic Surgeons (AAOS) regularly updates its guidelines on joint replacement surgery, incorporating the latest evidence-based practices.

Future research may also explore the role of emerging technologies, such as artificial intelligence and machine learning, in predicting and preventing PJI. These technologies could potentially identify patients at high risk of infection and personalize preventative interventions.