Hip Extension
Definition
The movement of the thigh behind the trunk, increasing the angle at the hip joint. Normal hip extension range is approximately 10-20 degrees beyond neutral. Measured using the Thomas test position (supine, edge of table) or in prone. Limited by hip flexor tightness, anterior hip capsule restriction, or lumbar compensation.
Clinical Significance
Hip extension is one of the most commonly restricted movements in sedentary populations. Sitting places the hip in sustained flexion, shortening the iliopsoas, rectus femoris, and TFL. When hip extension is restricted, the lumbar spine compensates with increased lordosis during walking and running. This is a primary mechanism for exercise-related low back pain. The Thomas test is one of the most informative single tests in a biomechanical assessment.
How AKMI Assesses This
AKMI measures hip extension using the modified Thomas test, quantifying iliopsoas length, rectus femoris length, and IT band/TFL length in a single position. The test also identifies lumbar compensation (excessive arch during the test) which indicates the true functional hip extension is less than the measured value.
Get your hip assessed
A biomechanical assessment measures hip extension and its relationship to the rest of your structural chain. 18 tests, objective data, personalized programming.