EXTENSOR CARPI

ULNARIS

• Origin

 
Lateral epicondyle of the humerus (via the common extensor tendon)
Posterior border of the ulna (via the aponeurosis).

• Insertion

 
Base of the 5th metacarpal (dorsal surface).

• Agonist(s)

- Extensor carpi radialis longus,

- Extensor carpi radialis brevis,

- Flexor carpi ulnaris (synergist in ulnar deviation).

• Antagonist(s)

- Flexor carpi radialis,

- Abductor pollicis longus,

- Extensor carpi radialis longus and brevis (in radial deviation).

• Function

 
Extends and adducts the wrist (ulnar deviation).
Helps stabilize the wrist during gripping and other hand movements.
Assists in wrist extension during various upper body activities.

TRIGGER POINT(S)

• Location

 
Trigger points are most commonly found in the proximal part of the muscle, near the lateral epicondyle of the humerus and along the ulnar side of the forearm.

Additional trigger points can develop at the muscle's insertion on the base of the 5th metacarpal.

• Pain Referral Pattern

 
Pain can radiate along the ulnar side of the forearm, down the pinky side of the hand, and sometimes into the 5th digit.

Referral pain may mimic conditions like lateral epicondylitis, ulnar nerve compression, or wrist tendonitis.

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Potential Causes

 
• Repetitive wrist extension or ulnar deviation (e.g., sports like tennis, weightlifting, or manual labor).

• Overuse of tools or activities requiring gripping with the wrist extended.

• Strain from compensating for weak wrist flexors.

• Inadequate warm-up or stretching before physical activity.

• Chronic muscle tension due to poor posture or body mechanics during manual work.

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Prevention Tips

 
• Perform wrist stretches and strengthening exercises to prevent imbalances between wrist flexors and extensors.

• Use proper ergonomics during repetitive tasks to minimize strain on the wrist.

• Warm up the wrists before engaging in sports or heavy lifting.

• Regularly alternate tasks to reduce the risk of overuse injuries.

• Pay attention to wrist alignment and avoid extreme ulnar deviation during prolonged activities.