1) Elbow (strike):(commonly referred to as simply an "elbow") is a strike with the point of the elbow, the part of the forearm nearest to the elbow, or the part of the upper arm nearest to the elbow. Elbows can be thrown sideways similarly to a hook, upwards similarly to an uppercut, or downwards with the point of the elbow. Elbowing is a disallowed practice in most combat sports. ...

1) Elbow (strike):(commonly referred to as simply an "elbow") is a strike with the point of the elbow, the part of the forearm nearest to the elbow, or the part of the upper arm nearest to the elbow. Elbows can be thrown sideways similarly to a hook, upwards similarly to an uppercut, or downwards with the point of the elbow. Elbowing is a disallowed practice in most combat sports.

2)Tennis elbow is a condition where the outer part of the elbow becomes painful and tender, usually as a result of a specific strain or overuse. Although it is called "tennis elbow", it should be noted that it is not restricted to tennis players. If one hyperextends(too much stretching)an elbow in any sport, this may be classified as tennis elbow. Anyone who does a lot of work involving lifting at the elbow or repetitive movements at the wrist is susceptible to tennis elbow. Golfer's elbow, or medial epicondylitis, is an inflammatory condition of the elbow which in some ways is similar to tennis elbow.

3) Nursemaid's elbow is a dislocation of the elbow joint caused by a sudden pull on the extended pronated arm, such as by an adult tugging on an uncooperative child.In radial(forearm bone) head subluxation(slipping), there is little complaint of pain, and the patient generally reports pain in the distal forearm. Radial head subluxation is a common pediatric(childhood) presentation generally occurring between the ages of 1 and 3 years. The mean age of presentation is just older than 2 years.

And many other types of injuries and disorders of the elbow joint can exist, by birth or by injury.