What is the correct LOD when palpating the lower thoracic vertebral flexion?

When palpating the lower thoracic vertebrae for flexion, the correct line of drive (LOD) is superior-inferior (S-I). This LOD is appropriate because, during flexion of the thoracic spine, the vertebral bodies move anteriorly and superiorly relative to their inferior neighbors. Therefore, to assess this motion effectively, the practitioner applies the palpation force in a direction that aligns with the normal kinematics of the thoracic spine during flexion.

Using a S-I line of drive allows for direct engagement with the segment being assessed and improves the ability to identify changes in motion or restrictions that may indicate dysfunction. In this context, applying pressure from a superior position toward the inferior part of the vertebra supports the natural movement patterns of the spine during flexion, making it an effective technique for evaluating spinal mechanics in this area.