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Patient and procedure-specific risk factors for deep infection after primary shoulder arthroplasty.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Richards, Jason Inacio, Maria C. S. Beckett, Michael Navarro, Ronald A. Singh, Anshuman Dillon, Mark T. Sodl, Jeff F. Yian, Edward H.
Spatial Coverage	United States
Description	Country affiliation: United States Author Affiliation: Richards J ( Southern California Permanente Medical Group, Orange, CA, USA.)
Abstract	BACKGROUND: Deep infection after shoulder arthroplasty is a diagnostic and therapeutic challenge. The current literature on this topic is from single institutions or Medicare samples, lacking generalizability to the larger shoulder arthroplasty population. QUESTIONS/PURPOSES: We sought to identify (1) patient-specific risk factors for deep infection, and (2) the pathogen profile after primary shoulder arthroplasty in a large integrated healthcare system. METHODS: A retrospective cohort study was conducted. Of 4528 patients identified, 320 had died and 302 were lost to followup. The remaining 3906 patients had a mean followup of 2.7 years (1 day-7 years). The study endpoint was the diagnosis of deep infection, which was defined as revision surgery for infection supported clinically by more than one of the following criteria: purulent drainage from the deep incision, fever, localized pain or tenderness, a positive deep culture, and/or a diagnosis of deep infection made by the operating surgeon based on intraoperative findings. Risk factors evaluated included age, sex, race, BMI, diabetes status, American Society for Anesthesiologists (ASA) score, traumatic versus elective procedure, and type of surgical implant. For patients with deep infections, we reviewed the surgical notes and microbiology records for the pathogen profile. Multivariable Cox regression models were used to evaluate the association of risk factors and deep infection. Adjusted hazard ratios and 95% CI are presented. RESULTS: With every 1-year increase in age, a 5% (95% CI, 2%-8%) lower risk of infection was observed. Male patients had a risk of infection of 2.59 times (95% CI, 1.27-5.31) greater than female patients. Patients undergoing primary reverse total shoulder arthroplasty had a 6.11 times (95% CI, 2.65-14.07) greater risk of infection compared with patients having primary unconstrained total shoulder arthroplasty. Patients having traumatic arthroplasties were 2.98 times (95% CI, 1.15-7.74) more likely to have an infection develop than patients having elective arthroplasties. BMI, race, ASA score, and diabetes status were not associated with infection risk (all p > 0.05). Propionibacterium acnes was the most commonly cultured organism, accounting for 31% of isolates. CONCLUSIONS: Younger, male patients are at greater risk for deep infection after primary shoulder arthroplasty. Reverse total shoulder arthroplasty and traumatic shoulder arthroplasties also carry a greater risk for infection. Propionibacterium acnes was the most prevalent pathogen causing infection in our primary shoulder arthroplasty population. LEVEL OF EVIDENCE: Level II, prognostic study. See the Instructions for Authors for a complete description of levels of evidence.
File Format	HTM / HTML
ISSN	0009921X
e-ISSN	15281132
DOI	10.1007/s11999-014-3696-5
Journal	Clinical Orthopaedics and Related Researchtextregistered
Issue Number	9
Volume Number	472
Language	English
Publisher	Springer
Publisher Date	2014-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Orthopaedics Arthroplasty, Replacement Adverse Effects Joint Diseases Surgery Joint Prosthesis Prosthesis-related Infections Epidemiology Risk Assessment Shoulder Joint Prognosis Proportional Hazards Models Prosthesis Failure Retrospective Studies Risk Factors Time Factors Multicenter Study
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Surgery Sports Science

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