- Front view (coronal plane): The body is even from right-to-left / left-to-right. The axis of the hip, knee, and ankle joints are directly aligned, with joints forming right angles (like a box). The shoulders are level. The head sits evenly between the shoulders and the hips are level, thus the spine maintains a centrally aligned vertical position between the pelvis up to the base of the skull
- Side view (sagittal plane): The body is even from front-to-back / back-to-front. The ear sits directly over the shoulder joint and the shoulder, hip, knee, and ankle joints should be vertically aligned and falling in the plumb-line (line of gravity), again the joints form right angles (like a box), with the hips in the proper tilt allowing for the spine to maintain its correct S-curve
- Bird’s-eye view (transverse plane): There should be no rotation of the torso from right-to-left or left-to-right, neither should there be a rotation of the pelvic girdle in either direction. There should be no rotation of the arms, therefore the view from the front should see only the thumb and index finger (and perhaps middle finger), and both hands should appear even. There should be no rotation of the thighs, therefore both kneecaps face directly straight ahead, and also no rotation of the lower legs, therefore feet should be pointed directly straight
"Posture is defined as the relative arrangement of the parts of the body. Good posture is that state of muscular and skeletal balance which protects the supporting structures of the body against injury or progressive deformity irrespective of the attitude (erect, lying, squatting, stooping) in which these structures are working or resting. Under such conditions the muscles will function most efficiently and the optimum positions are afforded for the thoracic and abdominal organs. Poor posture is a faulty relationship of the various parts of the body, which produces increased strain on the supporting structures and in which there is less efficient balance of the body over its base of support. Postural faults can give rise to discomfort, pain or disability. The range of effect from discomfort to incapacitating disability is related to the severity and persistence of the faults."
PTX would further add to the Committee’s position:
Posture is determined by stabilizer/fixator muscles (postural muscles) that dictate the relative arrangement of the parts of the body. These muscles and muscle groups attempt to maintain adequate tonicity in keeping the body’s center of gravity over its base of support in a standing static position. Upon movement, these same muscles attempt to act in accordance with the inert structures (i.e. thoracic and abdominal organs) by allowing optimum positions to be afforded. Therefore, the relevance of posture, with and without postural faults, is paramount in dictating biomechanics.