With the metaphorical term “clinical picture”, we want to highlight the importance of “how the patient appears”. According to the convention adopted in this text, the flexion pattern is, therefore, that of the patient who finds relief in trunk flexion (or in general in “de-lordotization” of the lumbar spine) or who does not feel a worsening in flexion while feeling pain, or who worsens, in extension. As mentioned above, this patient typically has pain with the maintenance of prolonged postures that favour venous stasis and even more typically when getting up from bed in the morning and in general in postural changes as long as after periods of immobility (supine-sitting, sitting-standing). Therefore, the mechanism that generates pain is narrowing the lumbar canal through the vicious circle between compression (nervous and venous), epidural venous dilation and further compression.