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Isolated Small-Finger Abduction

Draftstrength65%beginnerlimited evidence
View FHIR resourceFHIR R4 ActivityDefinition — the interoperable form of this exercise

Positions & Range of Motion

Start
seated with the forearm and hand supported, fingers extended and the small finger held adducted alongside the ring finger, a rubber band or manual resistance across the finger
End
small finger abducted sideways away from the ring finger against the resistance and held ~3 s before controlled return
Range of Motion
5th-MCP abduction from neutral to end range and back, isolated to the small finger

How to Perform

Abduct the small finger away from the ring finger against a rubber band or manual resistance. Targets ADM.

Watch on YouTube

Opens a YouTube search for “Isolated Small-Finger Abduction

Equipment:resistance band
Starting position: seated

Coaching Cues

  1. 1

    Long, straight pinky — abductor digiti minimi opens it sideways

    (verbal)
  2. 2

    Reach the pinky toward the outside wall

    (verbal)
  3. 3

    Hold the abducted position for three seconds

    (verbal)
  4. 4

    Free hand on hypothenar eminence to confirm activation

    (tactile)

Evidence-Based Dosing & EMG Data

Recommended Dosing

10–15 reps × 3×/week (extrapolated; no dosing in EMG study).

EMG Activation Data

Increased ADM activation with rubber-band resistance [Boudreau 2022].

Muscles Involved (4)

Primary Movers

Abductor Digiti MinimiEMG-validated activation [Boudreau 2022]

Secondary Movers

Dorsal Interossei (Hand)3rd and 4th DI

Stabilizers

Lengthened / Stretched

Palmar InterosseiAUDIT: Small-finger MCP abduction lengthens the digit-5 palmar interosseus (adductor), which is a pure antagonist here, not a contributor.

Easier Variations ↓

1

Active Abduction

Unresisted abduction.

Harder Variations ↑

1

Heavier Band

Increase band tension.

2

Combined Abduction + MCP Flexion

Add intrinsic-plus component.

Target Movements (1)

Finger Abduction (MCP)Metacarpophalangeal Joints