Full ROM against gravity but cannot tolerate added resistance. Full ROM only when gravity is eliminated. Trace (1) Palpable contraction but no visible joint movement. Zero (0) No palpable or visible contraction. Key Clinical Tests
Unlike other systems that test movements, Kendall emphasizes isolating individual muscles to pinpoint specific weaknesses or tightness.
Precise patient positioning is required to eliminate "substitution" or compensatory movements from other muscles during a test. The Kendall Muscle Grading System
The book by Florence Peterson Kendall is considered the "gold standard" in physiotherapy and manual muscle testing. This manual provides a systematic framework for evaluating muscle strength and length, focusing on how imbalances lead to faulty posture and chronic pain. Core Principles of the Kendall Method
Kendall's muscles : testing and function with posture and pain
The Kendall approach is built on the belief that is a direct reflection of musculoskeletal balance.
The manual details hundreds of tests, but some are fundamental to daily clinical practice: