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Pinch Strength

Additional Devices are required for this instrument. Please Consult the Links below for additional information on the devices

Laffayette Evaluation Strength Testing Link
B and L Engineering Strength Testing Link

Supplemental: Amyotrophic Lateral Sclerosis (ALS), Congenital Muscular Dystrophy (CMD), Duchenne Muscular Dystrophy (DMD), Facioscapulohumeral Muscular Dystrophy (FSHD), Neuromuscular Diseases (NMD) and Spinal Muscular Atrophy (SMA).
Note: Motor Strength Testing is Core: investigators must choose either Manual Muscle Testing (MMT) or a Quantitative Dynamometer measure as a part of any study.
The individual tests for muscle strength testing are listed as Supplemental.
Short Description of Instrument

Pinch Strength is a measurement of strength generated by the thumb and forefinger, of one pound. The amount of muscle strength loss can be determined.
To create more quantitative assessments of hand muscle strength, dynamometers have been developed. These dynamometer measurements are more sensitive to change compared to manual muscle testing and render outcome on a continuous scale.


Test should be performed at least three times. Record the result of each trial in the nearest pound or kilogram. Difference in scores should be within 6.6 lbs or 3 kg. If not, test should be repeated. Results are compared to published age and sex-specific norms.

Comments/Special Instructions


Andres PL, et al. Quantitative motor assessment in amyotrophic lateral sclerosis. Neurology 1986;36:937-941.
Muscle Study Group. Randomized pilot trial of betaINF1a in patients with IBM. Neurology 2001; 57:1566-1570.
Muscle Study Group. Randomized pilot trial of high-dose beta INF1a in patients with IBM Neurology 2004; 63:718-720.
Personius, K.E.; Pandya ,S.; King, W.M.; et al (1994). Facioscapulohumeral Dystrophy Natural History Study: Standardization of Testing Procedures and Reliability of Measurements, Physical Therapy, Vol 74, pp 253-263.


Document last updated July 2018