Index MCP flexion isometric
Resisted isometric flexion at the index MCP (no visible motion)
Goal
Resisted isometric movement (RIM) dosing at the MCP builds co-contraction without joint translation.
Motion taxonomy (reference)
Also called: RIM · resisted isometric · index MCP iso
Setup
- Forearm supported; index MCP near 70–90° flexion with adjacent fingers relaxed.
Steps
- 1Place the other hand on the proximal phalanx of the index finger.
- 2Try to flex the MCP further while blocking all motion.
- 3Ramp to ~30–40% effort, then relax fully.
Cues
- No collapsing into ulnar drift.
- Breathe out during the effort.
Common mistakes
- Shrugging the shoulder or squeezing the whole fist.
Stop if you feel
Stop rules
- Sharp pain (≥ 4/10)
- Increasing swelling during or after
- New or worsening numbness or tingling
- Color change in fingers (pale, blue, red)
- Wound opens, drains, or feels hot
- Next morning is worse than the day before
Progressions
- Slightly longer holds if 24–48 h response is calm.
Regressions
- Visualize pressure without measurable force.
Used in(2 guided demos)
Search the exercise library with this motion's clinical label for additional guided drills that may match your plan.
What to do next — not a dead end
Suggestions use body region, goal, motion type, and allowed phases — not your medical record. After surgery or a flare, follow your clinician first.
~1 min if held as written
6 reps · 2 sets · 5s hold · 2×/day
None required — table or bodyweight only.
Phases 2, 3, 4
Generally lower load — still respect pain and swelling.
Avoid if this sounds like you
Acute MCP collateral ligament injury
Unstable MCP joint
Reread best-for context ↑Where this shows up clinically
How phases map to healingNext best movements
Later phase or richer progression when you are ready.
Prerequisite / gentler lane
Same region and intent — usually earlier phase or lower risk.
Commonly paired with
Different primary goal, same region — typical mixed sessions.
Related movements
Similar mechanics, goals, or anatomy.
- Middle MCP flexion isometricstrength
- Ring MCP flexion isometricstrength
- Small-finger MCP flexion isometricstrength
- Thumb isometric into fingerstrength
- Finger spread wall isometricstrength
- Rubber band finger extensionstrength
- Towel bunchingstrength · moderate risk
- Wall weight bearingstrength · moderate risk
Guided exercises that use this
Step-by-step sessions that embed this movement pattern.
Keep momentum without overdoing it
Log a short check-in to protect your streak — even one quality set counts.