This graph shows us what the most common injuries are in the NFL. As we can see the NFL chooses to not disclose a plurality of injuries which may mean a number of things. The next three most common injuries are all leg related. This includes Knee, Ankle, and Knee-ACL. Using this information we know to put more protections on leg related injuries. (specifically involving the knees).
Injuries in the MLB
This pie chart shows us the most common injuries within the MLB. The two most common by far are Elbow and Shoulder related injuries. This makes sense for Baseball since between pitching and swinging, most of the movement within the sport is being done with the arms. The MLB can use this data and put resources into treatment and prevention methods for these injuries.