What does a long to short change in the supine to sit test indicate?

A long to short change in the supine to sit test indicates an anterior rotation of the innominate bone on the side that is measured. When performing the supine to sit test, the therapist observes the position of the patient's legs while transitioning from lying to sitting. If one leg appears longer when lying down and then "shortens" when sitting up, it suggests that the corresponding innominate bone is rotating anteriorly.

This anterior rotation can occur due to various factors, such as muscle imbalances, pelvic asymmetries, or hip joint restrictions. An understanding of this change is crucial because it helps in diagnosing potential pelvic dysfunctions that could lead to further musculoskeletal complications or affect kinetic chains during movement.

In contrast, other options refer to different movements or conditions that do not correlate to the observed change from supine to sit. Understanding this relationship is essential for practitioners in addressing and managing pelvic alignment and addressing potential issues affecting the patient's overall function and mobility.