📖 Static demo — read-only snapshot
You’re browsing a static build of the Body IQ knowledge graph, so everything loads with no backend. A few things that need the live server are turned off here:
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- The JSON API and the API “Try it” playgroundaren’t included.
- The data is a snapshot — it refreshes only when the demo is rebuilt, not live from the database.
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Thumb Opposition
First Carpometacarpal Joint • Hand
Complex movement bringing the thumb pad to contact the finger pads. Combines flexion, abduction, and medial rotation.
Normal Range of Motion
Opposition is a composite motion not measured with a goniometer. Standard clinical recording: full opposition = pad of thumb touches the pad or base of the fifth finger; deficits are recorded as the ruler distance (cm) from the thumb tip (or IP crease) to the fifth MCP joint or distal palmar crease, with 0 cm considered normal. The Kapandji score (0-10, where 10 = thumb tip to distal palmar crease) is an alternative published scale.
Source: AAOS Joint Motion / AMA Guides
Muscles (5)
| Muscle | Role | Notes |
|---|---|---|
| Opponens Pollicis | Primary | — |
| Abductor Pollicis Brevis | Synergist | Assists early opposition |
| Flexor Pollicis Brevis | Synergist | MCP flexion component |
| Adductor Pollicis | Synergist | Assists late opposition and power pinch |
| Opponens Digiti Minimi | Synergist | Cupping/opposition of 5th metacarpal |
Exercises (5)
Sources
- Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation — Biomechanics of Thumb Opposition