EXTENSOR CARPI RADIALIS LONGUS

• Origin

 
Lateral supracondylar ridge of the humerus (just above the lateral epicondyle)

• Insertion

 
Base of the 2nd metacarpal (dorsal side)

• Agonist(s)

- Extensor carpi radialis brevis

- Extensor carpi ulnaris

- Flexor carpi radialis (synergist in wrist abduction)

• Antagonist(s)

- Flexor carpi ulnaris (for wrist abduction)

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

• Function

 
Extends and abducts the wrist (radial deviation).

Assists in stabilizing the wrist during gripping motions.

Contributes slightly to elbow flexion when the forearm is pronated

TRIGGER POINT(S)

• Location

 
Trigger points are commonly found in the muscle belly approximately one-third of the way down the lateral forearm from the elbow.
 

Palpation along the lateral supracondylar ridge and proximal third of the forearm often reveals tenderness and taut bands.

• Pain Referral Pattern

 
Pain is typically referred along the lateral aspect of the forearm and may extend down to the dorsum of the hand near the base of the index and middle fingers.
 

Pain can mimic lateral epicondylitis (tennis elbow) and may be mistaken for radial nerve irritation.

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Potential Causes

 
• Repetitive wrist extension or gripping activities (e.g., typing, racquet sports, lifting).

• Poor ergonomics or overuse of a computer mouse.

• Excessive tension from lifting, especially with poor wrist alignment.

• Trauma to the lateral elbow or prolonged pressure on the forearm.

• Muscle imbalances between wrist flexors and extensors.

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 Prevention Tips

 
• Use ergonomic tools and maintain neutral wrist alignment during activities.

• Stretch and strengthen wrist extensors and flexors regularly.

• Take breaks during repetitive hand or forearm tasks.

• Avoid overloading the wrist during lifting or pushing activities.

• Treat early signs of overuse to prevent chronic strain and inflammation.