Objective: To determine whether biceps femoris long head (BFlh) fascicle length (FL) is related to hamstring injury (HSI) risk in collegiate football athletes. Design: Retrospective cohort. Setting: University athletic medical center. Participants: Division I Collegiate football athletes (n = 129, age = 20.03 ± 1.68 years, body mass index = 29.50 ± 5.06 kg/m2). Interventions: Biceps femoris long head FL measurements were previously taken on the nondominant leg of each athlete. Presence or absence of HSI for 2 playing seasons and training camps was evaluated through retrospective review of medical records. Main Outcome Measures: Whether a shorter BFlh FL was associated with increased risk for any HSI. Results: Biceps femoris long head FL was not associated with HSI risk. Body mass index =30 kg/m2 was incidentally found to be protective (odds ratio = 0.27, 95% confidence interval, 0.08-0.84, P = 0.03). Conclusions: Biceps femoris long head FL is not an ideal measurement for predicting risk of HSI in American football athletes.
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