• Origin

Lateral epicondyle of the humerus (via the common extensor tendon).

• Insertion

Base of the 3rd metacarpal (dorsal side).

• Agonist(s)

- Extensor carpi radialis longus

- Extensor carpi ulnaris

- Flexor carpi radialis (synergist in radial deviation).

• Antagonist(s)

- Flexor carpi ulnaris (for radial deviation)

- Flexor carpi radialis and flexor carpi ulnaris (for wrist extension).

• Function

Extends and abducts the wrist (radial deviation).
Plays a key role in stabilizing the wrist during finger flexion (gripping).
Supports wrist extension under load and repetitive motion.

TRIGGER POINT(S)

• Location

Trigger points are typically located in the proximal portion of the muscle, just distal to the lateral epicondyle, and may extend along the muscle belly down the lateral forearm.

Frequently tender where the muscle transitions to tendon near the lateral elbow.

• Pain Referral Pattern

Pain commonly radiates from the lateral epicondyle down the lateral forearm to the dorsum of the hand, particularly around the third metacarpal and wrist joint.

Referral pain may mimic or contribute to lateral epicondylitis (tennis elbow).

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Potential Causes

• Repetitive wrist extension or resisted gripping (e.g., using tools, typing, racquet sports),

• Poor ergonomics during computer or manual tasks,

• Overuse of the common extensor group, particularly in sports or jobs with repetitive arm movement,

• Tightness or imbalance in the wrist extensor group.

• Chronic stress or inflammation at the lateral epicondyle.

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Prevention Tips

• Use ergonomic wrist support and maintain neutral wrist posture during work.

• Strengthen and stretch wrist extensors and flexors to prevent overuse injuries.

• Rest adequately between high-repetition tasks.

• Warm up before activity and cool down with stretching.

• Avoid excessive gripping with extended wrist posture.