[6] In medicine and occupations concerned with physical fitness, the concept of good posture is referred to as "neutral spine".
[8] In the anterior/posterior view, deviation from vertical results in abnormal lateral curvature of the spine called scoliosis.
From the sagittal view the plumb line should bisect the ear, odontoid process of C2, the cervical vertebral bodies, the center of the glenohumeral joint, the lumbar vertebral bodies, the center of the acetabulum, just posterior to the patella, and through the tarsals of the feet.
[9] This sagittal line of reference theoretically indicates even distribution of weight between the front and the back of the body.
[8] Most recently, 3D imaging techniques using computed tomography (CT) and magnetic resonance (MR) have been attempted.