Sprains and Strains. Sprains and strains are among the most common injuries in sports. Learn about these injuries from information provided by the American Academy of Orthopaedic Surgeons (AAOS).

Ligament Injuries. The stability of the knee mostly depends on the ligaments and muscles around it. Therefore, injuries to knee ligaments are common. The AAOS provides an overview of these ligaments and the ways they are most commonly injured.

Meniscal Injuries. The meniscus helps the knee joint carry weight, glide, and turn in many directions. It also keeps your femur (thighbone) and tibia (shinbone) from grinding against each other. Learn why athletes frequently experience meniscal tears.

Prepatellar (Kneecap) Bursitis. Athletes who participate in sports in which direct blows or falls on the knee are common often suffer from prepatellar bursitis. The AAOS offers advice on prevention and treatment.

Ankle Sprains. Ankle sprains happen when the foot twists, rolls or turns beyond its normal motions. The AAOS explains how these common injuries are diagnosed and treated.

Shoulder Separation and Dislocation. The body's most mobile joint is also the one that is most frequently dislocated. Learn what shoulder dislocation/separation and instability are and what causes them.

Stress Fractures of the Foot and Ankle. Small cracks in bones often develop from overuse, such as from high-impact sports. Learn about their causes, symptoms, and treatment.

Burners and Stingers. These injuries, named for the burning pain that spreads from the shoulder to the hand, are common in contact or collision sports. The AAOS explains how they happen.

Heat Exhaustion. Heat exhaustion is a serious illness most often brought on by overexertion or profuse sweating in a hot, humid, poorly ventilated environment. Learn how to avoid it and how to recognize it and respond.

Muscle Cramps. The AAOS provides advice about how to prevent the sudden, tight, and intense pain caused by a muscle locked in spasm.

Creatine Supplements. Many athletes, including some children and adolescents, take creatine supplements to increase strength and improve sports performance. The AAOS discusses the pros and cons.

Steroids Don't Work Out. If you think anabolic steroids can improve your athletic performance or help you look good, think again. Learn why taking these drugs will not accomplish what you want from them.

Sports Nutrition. Athletes who want a winning edge need the right nutrition. The AAOS explains how sufficient hydration and a balanced diet help your body to make energy efficiently and fuel top performance.

Beginning a Weight Training Program. Weight training encourages muscles to become stronger. The AAOS offers advice on getting started.