A plumb line is often used as a reference of alignment for the body when examining posture. A plumb line is a string suspended overhead with a small weight, or plumb bob, attached at the end near the floor. Position the patient behind the line so you can see the body bisected by the plumb line.
Gait analysis is the systematic study of animal locomotion, more specifically the study of human motion, using the eye and the brain of observers, augmented by instrumentation for measuring body movements, body mechanics, and the activity of the muscles. Gait analysis is used to assess, plan, and treat individuals with conditions affecting their ability to walk.