normal postural alignment Flashcards
where are the landmarks set
the line of gravity should fall through the following landmarks on a lateral view
landmarks of normal postural alignment
ear lobe
acromion process
through the cervico-thoracic, thoraco-lumbar and lumbo-sacral junctions
the greater trochanter (posterior to the hip joint)
anterior to the knee joint, but posterior to the patella
anterior to the ankle joint
action line
gravity line is anterior to the joint axis
line of gravity is posterior to the joint axis
in the correct standing posture
gravity line is anterior to the joint axis
the torque will tend to cause anterior motion of the proximal segment of the body part supported by the joint
if the line of gravity is posterior to the joint axis
the torque will tend to cause motion of the proximal segment in a posterior direction
in the correct standing posture
the gravitational forces may be balanced by counter torques generated by muscles (hopefully minimal muscle activity) or passive ligamentous tension
