Dr. Kevin Yip

Dr Kevin Yip
Orthopaedic Surgeon
MBBS(UK), FRCS(EDIN), FAM(SING), FHKCOS(ORTHO)

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Muscles controlling the fingers-Resisted extension of each finger separately

Positioning and procedure.

The subject presents his hand palm downwards. The examiner stabilizes
the wrist with one hand. With the other, he applies resistance to the distal phalanx of each finger respectively.

Common mistakes.

None.

Anatomical structures tested:

Muscle function:

• Extension of the index finger:

– Extensor indicis proprius
– Tendon to the index finger of the extensor digitorum commun.is muscle

• Extension of the middle finger:

– Tendon to the middle finger of the extensor digitorum communis muscle

• Extension of the ring finger:

– Tendon to the ring finger of the extensor digitorum communis muscle

• Extension of the little finger:

– Extensor digiti minimi
– Tendon to the little finger of the extensor digitorum communis muscle.

Common pathological situations:

• Pain occurs in tendinitis of the extensor indicis proprius or of one of the tendons of the extensor digitorum communis.
• Weakness may occur in a lesion of the radial nerve.

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