Tennis Elbow (Lateral Epicondylitis): Clinical Evaluation and Surgical Management

What Is Tennis Elbow?

Tennis elbow, medically known as lateral epicondylitis, primarily involves degeneration at the tendon attachment of the extensor carpi radialis brevis (ECRB) on the lateral epicondyle of the humerus. About one-third of patients also have involvement of the extensor digitorum communis (EDC) tendon, while less commonly, the extensor carpi radialis longus (ECRL) or extensor carpi ulnaris (ECU) tendons may be affected.

Though the tendon attachments of ECRB and EDC are anatomically close, they can be distinguished several centimeters distal to the elbow joint. Modern research has clarified that tennis elbow is a degenerative tendinopathy rather than an inflammatory condition, meaning that tendon tissue breaks down over time instead of being acutely inflamed.

Patients usually experience pain around the lateral epicondyle, particularly slightly below and anterior to it. Pain worsens during wrist extension and forearm pronation against resistance. Other provocative maneuvers, such as wrist flexion or resisted forearm supination, may also exacerbate discomfort. Because symptoms can mimic radial tunnel syndrome, a precise clinical evaluation is essential.

MRI scans may show increased signal at the tendon insertion and tendon-bone separation, but imaging is mainly supportive; clinical diagnosis remains key.

Common Causes of Tennis Elbow

1. Repetitive Overuse

Repetitive wrist extension and forearm rotation are the leading causes of lateral epicondylitis. Activities like tennis, manual screwdriver use, and repetitive kitchen tasks can overstress the elbow tendons. Microtrauma accumulates over time, gradually causing tendon degeneration.

2. Tendon Degeneration

Contrary to the misconception of acute inflammation, tennis elbow is fundamentally a degenerative process. Chronic stress disrupts the tendon’s collagen architecture, reducing its elasticity and load-bearing capacity, making the tendon more susceptible to injury even with mild activity.

3. Biomechanical Imbalances

Weakness or imbalance in forearm muscles, particularly the wrist extensors, can overload the ECRB tendon. Improper movement patterns and repetitive stress further accelerate tendon wear.

Typical Symptoms

1. Lateral Elbow Pain

Persistent dull pain at the outer elbow, sometimes radiating down the forearm or wrist. Pain worsens with activity and improves with rest.

2. Tenderness on Palpation

Direct pressure over the lateral epicondyle or ECRB tendon attachment elicits clear tenderness—an important diagnostic sign.

3. Reduced Grip Strength

Patients often report difficulty gripping objects, lifting, or performing repetitive wrist motions.

4. Stiffness and Mild Swelling

Stiffness may occur after rest, particularly in the morning, and mild swelling can appear in severe cases.

Clinical Evaluation

1. Patient History

A detailed history identifies repetitive motions, occupational risks, and symptom characteristics. Key points include pain location, severity, and triggers.

2. Palpation

Examination focuses on the lateral epicondyle and ECRB tendon, assessing for tenderness and identifying the exact site of tendon degeneration.

3. Special Tests: Cozen Test

The Cozen test is a standard diagnostic maneuver:

1. Patient sits with elbow flexed and forearm pronated.

2. Examiner stabilizes the elbow, palpates the lateral epicondyle, and resists wrist extension.

3. Reproduction of lateral epicondyle pain indicates a positive test and confirms tennis elbow.

Surgical Treatment

Surgery is considered after at least 6 months of failed conservative treatment. The procedure aims to remove degenerative tendon tissue while preserving elbow stability.

Surgical Steps

1. Make a small incision over the lateral epicondyle, slightly anteriorly if necessary.

2. Identify the interval between ECRL and EDC muscles.

3. Expose and excise the degenerated portion of the ECRB tendon, which typically appears white or gray and brittle.

4. Perform limited debridement of the affected lateral epicondyle bone using a small burr or K-wire drilling.

5. If necessary, repair the ECRL tendon attachment.

6. Close the incision in layers, protecting the lateral ulnar collateral ligament.

Postoperative Care

• Initial immobilization with a sling for 2–3 days.

• Gradual elbow movement within tolerable range.

• Optional wrist splint in extension for 1–2 weeks to reduce stress on the repaired tendon.

• Full activity resumes once wound healing and range of motion are satisfactory.

Conclusion

Tennis elbow (lateral epicondylitis) is a common, degenerative tendon disorder triggered by repetitive stress and biomechanical imbalances. Early recognition, clinical evaluation, and conservative care are crucial. Surgery is reserved for chronic, non-responsive cases, focusing on precision tendon debridement and anatomical repair to restore function and alleviate pain.

Keywords: tennis elbow, lateral epicondylitis, ECRB tendon, elbow pain, Cozen test, surgical treatment, tendon degeneration