Extensor Digitorum

The Pointer Plus is an easy to use trigger point (TP) locator which
incorporates a push button stimulation feature to immediately treat
Trigger point pain.
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The Extensor Digitorum is a superficial posterior muscle of the forearm.

Anatomical Attachments:
- Origin: Attaches to the lateral epicondyle of the humerus by the common extensor tendon.
- Insertion: Attaches to the 4 tendons of the distal phalanges and the extensor expansions of the medial 4 digits.
Action: Extends all of the fingers with the exception of the thumb, and aids in the extension of the wrist.
Synergist: Brachioradialis, Supinator, Extensor Carpi radialis brevis and longus, Abductor pollicis longus, Extensor pollicis brevis and longus, Extensor digiti minimi, Extensor carpi ulnaris, Extensor indicis.
Antagonist: Pronator teres, Flexor carpi radialis, Palmaris longus, Flexor carpi ulnaris, Flexor digitorum superficialis, Flexor digitorum profundus, Flexor pollicis longus, Pronator quadratus.
Click for Muscle Test
Nerve Supply: Radial nerve (C6, C7, C8).
Vascular supply: Posterior interosseus of the ulnar artery.
Travell and Simons Trigger Point Pain Referral:
- Primary: The pain extends down the dorsum of the forearm, the wrist and the hand including the middle finger. Occasionally it may cause pain on the volar side of the wrist.
- Satellite or associated triggers: Supinator, Brachioradialis, Extensor carpi radialis longus, Extensor carpi ulnaris.
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Trigger Point Signs and Symptoms: Weakness of grip, stiffness and tenderness of the IP joints, cramping of the fingers, soreness in the finger joints.
Trigger Point Activating and Perpetuating Factors: Repetitive finger movements, typing, playing a musical instrument, repetitive tapping of the fingers, playing video games.
Differential Diagnosis: Lateral Epicondylitis (tennis elbow), (Segmental, Subluxation, Somatic dysfunction) C7 radiculopathy, DE Quervain’s stenosing tenosynovitis, Ganglion cyst, Systemic infections or inflammation, Nutritional inadequacy, Metabolic imbalance, Toxicity, Side effects of medication.
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