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"Acute" means that something has happened to cause an injury, like an accident, trauma, etc. Examples of trauma can include twisting your knee, sliding into base incorrectly, and direct impacts with other players or the ball.

Acute injuries in softball and baseball include:

• ACL injuries
  Twisting your knee or running into another player can result in an injury to your anterior cruciate ligament (ACL).

• Meniscus tears
  Twisting the knee can also cause tears of a cartilage in your knee, called the meniscus.

• Contusions
  Deep bruises from running into another player or getting hit by an errant ball.

• Ankle sprains
  Twisting your ankle while running causes a sprain with significant pain and swelling.

Baseball and softball are notoriously hard on the shoulders and knees. Typical problems include:

• Rotator cuff tendonitis
  Rotator cuff tendonitis is an irritation of the tendons and muscles of your shoulder. Learn more here.

• Knee tendonitis
  Knee tendonitits is an irritation of the tendons and muscles of your knee.