The quest to identify injury risk factors in sports has been an ongoing and well-researched field in the world of sports medicine. Knowing some of these factors helps keep sports participation safe. Both intrinsic and extrinsic factors have been studied. Body mass index (BMI) is widely known to contribute to several medical conditions. Its association with some sports injuries has been established but the information is vast, with few studies that are randomized controlled trials. It is important to analyze these studies and confirm whether BMI is a predictor of lower-extremity injuries. Such knowledge allows for better effective treatment and prevention strategies. This article will summarize current evidence of association between BMI and lower-extremity injuries in athletes and whether BMI is a predictor of lower-extremity injuries.