Zero method

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(Physics) a method of comparing, or measuring, forces, electric currents, etc., by so opposing them that the pointer of an indicating apparatus, or the needle of a galvanometer, remains at, or is brought to, zero, as contrasted with methods in which the deflection is observed directly; - called also null method.

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Secondary target variables included the girth of the ankle (swelling) (recorded by the figure-of-eight method), pain scaling using a visual analog scale (VAS), evaluation of the limitation of movement by the neutral zero method, the use of emergency medication (paracetamol tablets), the final global evaluation of efficacy (physician's and patient's judgment, 4-step scale), and evaluations of cosmetic properties (patient's judgment).
Limitation of movement (plantar flexion, dorsiflexion as well as abduction/adduction) was determined by the neutral zero method (Zippel, 1996).
This applied both to the functional limitations measured by the neutral zero method (Zippel, 1996) and the joint swelling.