Traction is a modality that applies mechanical forces to the body to separate joint surfaces and decrease pressure. The force can be applied manually by the therapist or mechanically by a machine. Traction is indicated for many diagnoses and allows for variation and adjustment of the established protocol based on individual patient need. Traction affects many of the body's systems and requires ongoing monitoring and reassessment of treatment parameters. Mechanical traction, self-traction, manual traction and positional traction are commonly utilized techniques.