Risk factors for stress fractures among Israeli infantry recruits

Area of Science:

• Orthopedics
• Sports Medicine
• Military Health

Background:

• Stress fractures are a common injury in military recruits, particularly infantry soldiers.
• High morbidity rates of stress fractures among Israeli infantry recruits necessitate investigation into underlying risk factors.
• Understanding these factors is crucial for developing targeted prevention strategies.

Purpose of the Study:

• To prospectively identify risk factors associated with high stress fracture morbidity in Israeli infantry recruits.
• To differentiate risk factors for tibial versus femoral stress fractures.

Main Methods:

• Prospective evaluation of 392 infantry recruits prior to military training.
• Detailed pre-training assessment of potential risk factors.
• Multivariate analysis to identify statistically significant predictors of tibial stress fractures.

Main Results:

• Five significant risk factors for tibial stress fractures were identified: shorter tibial length, greater valgus knee alignment, right leg dominance, hip external rotation exceeding 65 degrees, and training in specific subunits.
• Statistical significance (p < 0.0001 to p < 0.03) was established for these tibial fracture risk factors.
• Multivariate analysis did not identify any specific risk factors for femoral stress fractures in this cohort.

Conclusions:

• Specific anatomical and biomechanical factors, along with unit-specific training, contribute to tibial stress fracture risk in infantry recruits.
• Targeted interventions focusing on these identified risk factors may help reduce stress fracture incidence.
• Further research is needed to understand femoral stress fracture etiology in this population.