📖 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:

  • Global search (sidebar) is disabled — it queries the API.
  • 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.

Everything else — the body map, progression ladders, coverage heatmap, exercise finder, and all anatomy/exercise/source pages — works fully. The full app (live search + API + database) runs from the source on GitHub.

Thumb Extension (IP)

Thumb Interphalangeal Joint • Hand • sagittal plane

Draft80%

Straightening the thumb at the interphalangeal joint.

Axis: medial-lateral

Normal Range of Motion

AROM
0–20°
Active range
PROM
0–20°
Passive range

AAOS lists thumb IP hyperextension of approximately 20 degrees beyond neutral. Extension beyond 0 degrees is variable between individuals; some references simply record extension as return to 0 with hyperextension noted separately (passive hyperextension up to about 30 degrees can be normal).

Source: AAOS Joint Motion

Muscles (1)

MuscleRoleNotes
Extensor Pollicis LongusPrimary—

Exercises (1)

Thumb IP and MCP Strengthening

Sources