Which assessment test measures hip flexor flexibility?

The Thomas test is specifically designed to assess hip flexor flexibility. During this test, an individual lies on a table and brings one knee up towards their chest while allowing the other leg to hang off the side. This position highlights tightness in the hip flexors; if the leg that is hanging off the table does not remain flat, it indicates a limitation in flexibility of the hip flexors. The primary focus here is on the iliopsoas muscle group, which is crucial for hip flexion.

The other options are unrelated to hip flexor flexibility. The Apley's scratch test primarily assesses shoulder mobility and flexibility, particularly in the areas of the shoulder's range of motion. Tests for shoulder internal rotation and shoulder flexion also focus on shoulder joint movements rather than the hip area. Thus, the Thomas test stands out as the appropriate choice for measuring hip flexor flexibility.