Structures manual muscle testing and dynamometry with grading and functional correlation. Use when testing muscle strength, grading MMT, or documenting strength assessment.
Structures manual muscle testing (MMT) and dynamometry documentation using the Medical Research Council (MRC) grading scale, handheld dynamometry, and isokinetic testing with functional correlation and effort-consistency analysis.
Strength testing quantifies neuromuscular function and drives every rehabilitation decision from exercise prescription to return-to-work clearance. MMT grades directly influence impairment ratings under the AMA Guides, determine workers compensation benefits, and establish medical necessity for continued therapy. Dynamometry provides objective force data that withstands legal scrutiny. Inaccurate grading, failure to document testing position, or missing effort-consistency data renders strength assessments unreliable for clinical and medicolegal purposes. This skill standardizes testing protocol, grading conventions, and the critical link between strength deficits and functional impairment.
Before beginning strength testing, confirm:
Required clinical questions:
Required documents:
| Clinical Context | Primary Method | Supplemental Method |
|---|---|---|
| Neurological weakness (MMT <3/5) | Manual muscle testing (gravity-eliminated and against gravity) | None — dynamometry unreliable below fair grade |
| Post-surgical strengthening (MMT 3+/5 to 4/5) | MMT with dynamometry | Grip/pinch dynamometry for UE |
| Return-to-work / sport clearance | Handheld dynamometry (HHD) or isokinetic testing | Functional performance testing |
| Impairment rating (AMA Guides) | MMT per AMA Guides tables | Grip dynamometry (Jamar protocol) |
| Pediatric assessment | Modified MMT with age-appropriate positioning | Handheld dynamometry for children ≥6 years |
| Effort consistency / malingering screening | Grip dynamometry (5-position Jamar) | Rapid exchange grip, coefficient of variation analysis |
MRC (Medical Research Council) grading scale:
Testing rules:
Grip dynamometry (Jamar or equivalent):
Five-position grip test (effort consistency):
Handheld dynamometry (HHD):
Pinch dynamometry:
Every documented strength deficit must connect to function:
For all strength testing, document effort indicators:
Document any discrepancies factually without drawing conclusions about intent: "Grip strength trials at position II yielded 35, 22, and 48 lbs (CV = 37%), and patient was observed carrying 10-lb bag in involved hand in waiting room. Effort consistency is rated as inconsistent. [VERIFY]"
Before finalizing the strength testing report: