n International SportMed Journal - Increasing incidence of hamstring injuries in Major League Baseball pitchers : original research article

Volume 15, Issue 3
  • ISSN : 1528-3356



Baseball pitching involves coordinated movements between the upper extremity, trunk, and lower extremity. Among pitchers, hamstring injuries are the second most common lower extremity injury.

Investigate the 10-year incidence and demography of hamstring injuries in Major League Baseball pitchers.
Descriptive study.
The Major League Baseball Disabled list from 2001 to 2010 identified 61 pitchers with hamstring injuries. Age, body mass index, throwing hand dominance, and days on the Disabled list were analysed.
The annual incidence of hamstring injuries increased over time. Mean age at injury was 30.6 ± 5.1 years, mean height 188.7 ± 5.8 cm, mean weight 99.8 ± 12.1 kg, and mean BMI 28.0 ± 2.8 kg/m2. Mean length of stay on the disabled list was 27.7 ± 20.0 days. There was a correlation between age and BMI (p < 0.010). There was no correlation between days on the Disabled list and age (p = 0.275) or BMI (p = 0.908). There was no difference in age (p = 0.381), BMI (p = 0.736), or days on the Disabled list (p = 0.530) between pitchers with injured hamstrings ipsilateral versus contralateral to their throwing arm.
The incidence of hamstring injuries in Major League Baseball pitchers increased over time. Number of disabled days averaged 4 weeks, but was variable. Injuries contralateral to the throwing arm were more common but not more debilitating. These findings can be useful for preventive strengthening programmes and rehabilitation techniques in pitchers.

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