The Incidence and Incubation Period of False Positive Cultures in Shoulder Surgery

Study Overview
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Brief Summary
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This study will describe the time point at which a positive culture from a patient who has undergone shoulder surgery should be treated as an infection versus a false positive result that should be disregarded. Intraoperative biopsies will be taken and cultured from 50 subjects who have undergone an open surgical procedure and 50 from subjects undergoing an arthroscopic procedure.

Detailed Description
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Postoperative infection is a significant complication that requires timely identification and treatment. Indolent infections, such as those involving Propionibacterium acnes (P. acnes), pose a diagnostic dilemma as they present differently than the acute symptoms typically associated with most postoperative bone and joint infections. The workup of these suspected infections is also somewhat difficult, as these colonies are slow growing, necessitating that cultures be kept for an extended period of time. Previous studies have shown that positive cultures are typically identified between 7 and 13 days. In a recent study of patients undergoing primary shoulder arthroplasty, 41.8% of patients were found to have P. acnes growth from their joint fluid at a mean of 7 days (range 5-9 days). All of these patients were then treated immediately with 4 weeks of dual oral antibiotic therapy1. As the incubation of laboratory cultures increases, there is the potential concern of false positive growth. Timely identification is critical in order to avoid performing unnecessary treatments on patients in whom no infection is actually present. The investigators will enroll patients undergoing primary shoulder surgery for a clearly identified mechanical dysfunction, in which there is no clinical suspicion for infection. Infection should not exist in this population, making it an appropriate clinical sample in which to study results that the investigators would consider to be false positives.

Official Title
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The Incidence and Incubation Period of False Positive Cultures in Shoulder Surgery Study Protocol: A Pilot Study

Conditions
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Infection

Intervention / Treatment
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* Other: Culture


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients undergoing primary open and arthroscopic shoulder surgery in which there is a clear diagnosis of a mechanical problem that is felt to be amenable to surgical intervention and there is no suspicion of infection. Examples include, but are not limited to: rotator cuff tear, labral tear, instability, impingement, and osteoarthritis. Exclusion Criteria: Prior shoulder surgery Prior glenohumeral injection within the last 6 months Systemic or shoulder inflammatory disorder Any clinical, imaging, or laboratory findings that raise suspicion of infection Minors Erythrocyte sedimentation rate (ESR) >15 mm/hr for males less than 50 years old, >20 mm/hr for males greater than 50 years old and females less than 50 years old, and >30 mm/hr for females greater than 50 years old C reactive protein (CRP) >1 mg/d, Procalcitonin (PCT) >0.05 ng/ml.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Open Shoulder Surgery<br>Culture | Other: Culture<br>* Specimens will be obtained and sent to the lab for cultures.<br>|
| Arthroscopic Shoulder Surgery<br>Culture | Other: Culture<br>* Specimens will be obtained and sent to the lab for cultures.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of positive cultures |  | 28 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incubation time clarification for culture growth if it occurs |  | Less than or equal to 28 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Propionibacterium acnes, shoulder surgery, infection