Osteomyelitis Risk Factors Related to Combat Trauma Open Tibia Fractures: A Case-control Analysis

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Abstract

Objectives:

We assessed osteomyelitis risk factors in U.S. military personnel with combat-related open tibia fractures (2003-2009).

Methods:

Patients with open tibia fractures who met diagnostic criteria of osteomyelitis were identified as cases using Military Health System data and verified through medical record review. Controls were patients with open tibia fractures who did not meet osteomyelitis criteria. Gustilo-Andersen (GA) fracture classification scheme was modified to include transtibial amputations (TTAs) as the most severe level. Logistic regression multivariable odds ratios (OR; 95% confidence interval [CI]) were assessed.

Results:

A total of 130 tibia osteomyelitis cases and 85 controls were identified. Excluding patients with TTAs, osteomyelitis cases had significantly longer time to radiographic union compared to controls (median: 210 versus 165 days). Blast injuries, antibiotic bead utilization, ≥GA-IIIb fractures (highest risk with TTA [OR: 15.10; CI: 3.22-71.07]) and foreign body at fracture site were significantly associated with developing osteomyelitis. In a separate model, the Orthopaedic Trauma Association Open Fracture Classification muscle variable was significant with increasing risk from muscle loss (OR: 5.62; CI: 2.21-14.25) to dead muscle (OR: 8.46; CI: 3.31-21.64). When TTAs were excluded, significant risk factors were similar and included sustaining an injury between 2003 and 2006.

Conclusions:

Patients with severe blast trauma resulting in significant muscle damage are at the highest risk for osteomyelitis. The time period association coincides with a timeframe when several trauma system practice changes were initiated (e.g., increased negative pressure wound therapy, decreased high pressure irrigation, and reduced crystalloid use).

Level of Evidence:

Prognostic Level III

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