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Assessment of Severe Extremity Wound Bioburden at the Time of Definitive Wound Closure or Coverage (Bioburden)

This study is ongoing, but not recruiting participants.
United States Department of Defense
Information provided by (Responsible Party):
Major Extremity Trauma Research Consortium Identifier:
First received: November 7, 2011
Last updated: December 22, 2016
Last verified: April 2016
The purpose of this study is to characterize the bacteria in the wound "bioburden" at the time of definitive wound coverage/closure of severe tibia fractures in both the military and civilian populations.

Open Fracture

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Prospective
Official Title: Assessment of Severe Extremity Wound Bioburden at the Time of Definitive Wound Closure or Coverage: Correlation With Subsequent Post-Closure Deep Wound Infection: Bioburden Study

Resource links provided by NLM:

Further study details as provided by Major Extremity Trauma Research Consortium:

Primary Outcome Measures:
  • Infection [ Time Frame: 1 year ]
    The presence of a deep surgical site infection will be defined by the criteria of the Centers for Disease Control. Deep SSI occurs within 30 days after the operation if no implant is left in place, or within one year if implant is in place and the infection appears to be related to the operation.

Secondary Outcome Measures:
  • Classification of Appropriate Antibiotic Care [ Time Frame: 1 year ]
    An expert panel consisting of the study PI, two additional orthopaedic trauma surgeons and at least three infectious disease experts will be convened to develop a classification grid for the most common and/or expected microbial species to be found in this study and the related antibiotic treatment regimens used in the initial care of these patients. For each microbial species, the expert panel will classify a given antibiotic regimen as "appropriate" and "not appropriate", based on the best available published data.

Biospecimen Retention:   Samples With DNA

Estimated Enrollment: 600
Study Start Date: September 2011
Estimated Study Completion Date: June 2017
Primary Completion Date: September 2016 (Final data collection date for primary outcome measure)
severe open fractures of the tibia bone

Detailed Description:

Infection remains the most common and significant complication following high energy fractures. The strategies used in the prevention of deep infection following severe open fracture wounds have remained constant for the past 20 years.

This project is designed to analyze the microbiology profiles of wounds from severe tibia fractures at closure by comparing two methods: routine microbiology techniques and PCR methods using the Ibis T5000 Biosensor System. The results from both identification methods will be compared to the pathogens associated with deep surgical site infections that occur post closure of the wound. Currently it is unknown which of these methods will yield information that can lower complication rates and better function of the leg. Our goal is to perform a multi-center, prospective cohort study of wound bacterial bioburden and associated antibiotic care in severe open lower extremity fractures.

Primary Aim: In a subset of 60 patients, compare the bioburden, as detected by Ibis technology, from each of three sampling techniques (deep tissue; soft tissue composite; composite of tissue from the length and depth of the wound). Samples obtained using the most effective technique identified in this step will be processed using Ibis in subsequent tissue analysis. Effectiveness is defined as the ability to identify key wound infection-causing pathogens.

Primary Hypothesis: The composite sampling approach will be the most effective technique.

Secondary Aim: Characterize the wound bioburden at the time of definitive wound closure or coverage using the Ibis T5000 Biosensor System PCR technology as compared to standard microbiology techniques.

Hypothesis 2: The Ibis technology will detect more species of pathogens than standard microbiology techniques. The percent of patients for whom Ibis will detect all species identified by standard microbiology will be greater than 95%.

Specific Aim 3: Characterize the wound bioburden in the patients who develop deep infection within one year of wound closure, and determine the association between infecting pathogens with initial wound closure bioburden as measured jointly by Ibis and standard microbiology techniques.

Specific Aim 4: Document the variability in antibiotic selection and duration, and examine the impact of this selection on subsequent deep infection.

Hypothesis 4a: Among patients treated with antibiotic regimens that are appropriate for the pathogens identified by standard microbiology, there will be a lower probability of deep infection than among those patients who received inappropriate antibiotic regimens.

Hypothesis 4b: Among patients treated with antibiotic regimens that are appropriate for the pathogens identified by Ibis, there will be a lower probability of deep infection than among those patients who received inappropriate antibiotic regimens.


Ages Eligible for Study:   18 Years to 64 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Particiapting METRC Trauma Centers across the country.

Inclusion Criteria:

  1. All open Grade III tibia fractures (plateau, shaft, pilon) requiring a second procedure following fixation, or traumatic transtibial amputations requiring delayed primary closure, skin grafting and/ or flap coverage.
  2. Ages 18 - 64 years inclusive
  3. Patients may have risk factors for infection including diabetes, immunosuppression from steroids or other medications, HIV, or other infections.
  4. Patients may have a traumatic brain injury.
  5. Patients may have other fractures including spine, upper extremity fractures, contralateral lower extremity injuries, ipsilateral pelvis, hip, femur or foot injuries.
  6. Patients may be treated initially at an outside institution prior to transfer to the study institution, as long as the definitive fixation was not performed prior to entrance into the study.
  7. Patients with bilateral injuries that meet inclusion criteria may be included, but only the limb rated as "more severe" by the treating surgeon will be enrolled in the study.
  8. Patients may have co-existing non-tibial infection, with or without antibiotic treatment.
  9. Patients may have an existing infection of the surgical wound under treatment at the time of wound closure.
  10. Patients may be definitively fixed using any method (nail, plate, ex fix)
  11. Patients may have a fasciotomy

Exclusion Criteria:

  1. Patient speaks neither English nor Spanish
  2. Patient is a prisoner
  3. Patient has been diagnosed with a severe psychiatric condition
  4. Patient is intellectually challenged without adequate family support
  5. Patient lives outside the hospital's catchment area
  6. Patients with planned follow-up at another medical center
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01496014

  Show 40 Study Locations
Sponsors and Collaborators
Major Extremity Trauma Research Consortium
United States Department of Defense
Principal Investigator: Michael J Bosse, MD Carolinas Medical Center
  More Information

Responsible Party: Major Extremity Trauma Research Consortium Identifier: NCT01496014     History of Changes
Other Study ID Numbers: A-15737.5a
Study First Received: November 7, 2011
Last Updated: December 22, 2016

Keywords provided by Major Extremity Trauma Research Consortium:
open fracture wounds
tibia fractures
antibiotic therapies in severe fractures
All severe open fracture of the tibia bone

Additional relevant MeSH terms:
Fractures, Open
Fractures, Bone
Wounds and Injuries processed this record on April 26, 2017