Thomas Test
Definition
A clinical test performed supine at the edge of a table. The client pulls one knee to their chest (flexing the hip maximally) while the other leg hangs off the edge. The position of the hanging leg reveals tightness in the iliopsoas (thigh rises above horizontal), rectus femoris (knee extends), and IT band/TFL (thigh abducts or externally rotates). Named after Hugh Owen Thomas.
Clinical Significance
The modified Thomas test is one of the most information-dense single tests in biomechanical assessment. It simultaneously evaluates three muscle groups and their influence on pelvic position. A positive Thomas test (restricted hip extension) is the direct measurement behind the common complaint of 'tight hip flexors' -- though the cause is often sustained sitting rather than true muscle shortening. The test result determines whether the intervention should target the iliopsoas, rectus femoris, or TFL specifically.
How AKMI Assesses This
AKMI performs the modified Thomas test bilaterally and records the angle of the thigh relative to horizontal (hip flexor length), the angle of the knee (rectus femoris length), and any lateral deviation (IT band/TFL). Left vs. right comparison identifies asymmetry. Cross-referenced with pelvic tilt measurement to confirm the functional impact.
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A biomechanical assessment measures thomas test and its relationship to the rest of your structural chain. 18 tests, objective data, personalized programming.