Tennis elbow, also known as lateral epicondylitis

Tennis elbow, also known as lateral epicondylitis, is a condition in which the lateral part of the elbow becomes painful and tender. The pain may also extend into the back of the forearm and grip strength may be weak. The onset of symptoms is generally gradual. ​If left untreated lateral epicondylitis can lead to chronic pain that degrades the quality of daily living.

It is due to excessive use of the muscles of the back of the forearm. Typically this occurs as a result of work or sports classically racquet sports.  About 2% of people are affected. Those 30 to 50 years old are most commonly affected. 

Signs and symptoms

• Pain on the outer part of the elbow (lateral epicondyle)
• Point tenderness over the lateral epicondyle—a prominent part of the bone on the outside of the elbow
• Pain from gripping and movements of the wrist, especially wrist extension (e.g. turning a screwdriver) and lifting movements

Symptoms associated of tennis elbow include, radiating pain from the outside of the elbow to the forearm and wrist, pain during extension of wrist, weakness of the forearm, a painful grip while shaking hands or torquing a doorknob, and not being able to hold relatively heavy items in the hand. The pain is similar to the condition known as golfer's elbow, but the latter occurs at the medial side of the elbow.

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Tennis elbow is a type of repetitive strain injury resulting from tendon overuse and failed healing of the tendon. the extensor carpi radialis brevis muscle plays a key role.
Early experiments suggested that tennis elbow was primarily caused by overexertion. However, studies show that trauma such as direct blows to the epicondyle, a sudden forceful pull, or forceful extension cause more than half of these injuries. Repeatedly mis-hitting a tennis ball in the early stages of learning the sport causes shock to the elbow joint and may contribute to contracting the condition

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Treatment
Nonsurgical Treatment
Approximately 80% to 95% of patients have success with nonsurgical treatment.
Rest. The first step toward recovery is rest. This means  stop participation in sports or heavy work activities for several weeks.
Non-steroidal anti-inflammatory medicines. Drugs like aspirin or ibuprofen reduce pain and swelling.

Wrist stretching exercise
Wrist stretching exercise with elbow extended.
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Physical therapy. Specific exercises are helpful for strengthening the muscles of the forearm Along with  massage techniques to improve muscle healing.

Brace. Using a brace centered over the back of your forearm may also help relieve symptoms of tennis elbow. This can reduce symptoms by resting the muscles and tendons.

References

• Tennis Elbow (Lateral Epicondylitis)". OrthoInfo. July 2015. Retrieved 21 June 2018.
• Tennis Elbow: Clinical Management. Springer. p. 1. ISBN 9781489975348.
  
• Elbow Pain, Cleveland Clinic, 2018. Accessed 23 January 2018.