Motor and Physical Assessment

Motor and physical assessment in occupational therapy evaluates the sensorimotor body functions that underpin doing: muscle strength, range of motion, coordination, dexterity, and the recovery of movement after neurological injury. These measures form a bottom-up complement to occupation-based evaluation, quantifying the physical capacities that enable or constrain task performance.

Definition

Motor and physical assessment is the standardised measurement of sensorimotor body functions and structures, including strength, joint range of motion, coordination, manual dexterity, and motor impairment after injury, that contribute to a person's ability to perform activities.

Scope

This topic covers standardised measures of strength, range of motion, manual dexterity, and post-stroke motor recovery used in occupational therapy, together with the norms and psychometrics that make them interpretable. It explains what these tests measure and how they are scored as reference knowledge; it does not specify which assessment to apply to, or how to treat, any individual.

Core questions

• What are the person's strength, range of motion, and dexterity relative to normative values?
• How much motor impairment or recovery is present after a neurological event?
• How do measured physical capacities relate to the demands of the person's valued tasks?

Key concepts

• Muscle strength and grip strength
• Range of motion
• Manual dexterity
• Motor impairment and recovery
• Normative reference values
• Test-retest reliability and standardisation

Mechanisms

Physical capacities are quantified with standardised procedures and instruments: dynamometry for grip strength interpreted against published norms, goniometry for joint range of motion, and timed peg- or block-manipulation tasks for manual dexterity. After stroke, ordinal motor scales such as the Fugl-Meyer Assessment grade reflexes, voluntary movement, coordination, and sensation to characterise impairment and track recovery. Because tests are administered with defined positioning and instructions and compared to reference values, they yield reproducible scores that can be related to the physical demands of occupations within the ICF framework of body functions and structures.

Clinical relevance

Quantified motor and physical findings help describe the impairments that may limit activity and provide objective baselines against which change can be judged. As reference content this topic describes how the measures work; it is not a basis for diagnosing or selecting treatment for any particular person, which require professional clinical judgement.

Evidence & guidelines

The Fugl-Meyer Assessment is a widely used and extensively validated measure of post-stroke motor impairment, and standardised dexterity and grip-strength procedures with adult norms support reliable measurement of hand function. These measures map onto the body-function and structure components of the ICF.

History

Standardised physical measurement in rehabilitation expanded through the 1970s and 1980s, with the Fugl-Meyer Assessment introduced in 1975 to grade post-stroke motor recovery and normative studies of dexterity and grip strength published through the 1980s that gave occupational therapists reproducible reference values.

Debates

How well do impairment measures predict everyday activity?

Strength, range of motion, and impairment scales quantify body functions reliably, but their relationship to real-world occupational performance is imperfect, which is why bottom-up motor measures are usually combined with occupation-based assessment.

Key figures

• Axel Fugl-Meyer
• Virgil Mathiowetz

Seminal works

• fugl-meyer-1975
• mathiowetz-1985-bbt

Frequently asked questions

What does the Fugl-Meyer Assessment evaluate?

It is an ordinal scale that grades motor impairment after stroke, examining reflexes, voluntary movement, coordination, sensation, and other components to characterise impairment and track recovery.

Why are normative values important in grip and dexterity testing?

Norms let a therapist judge a person's measured strength or dexterity against expected values for age and hand dominance, so that a single score can be interpreted as typical or impaired.