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The aim of the study was to compare a novel infrared optoelectronic system (Perometer) of limb volume measurement with water displacement and two indirect measurement techniques.

A prospective experimental study.

In 10 healthy male volunteers (20 limbs) we compared limb volume measurements obtained by water displacement, infrared perometry, the disc model method and the frustrum method. In a further 17 patients with swollen limbs due to lymphatic (9 limbs) or venous (11 limbs) disease, perometry was compared to the disc model method and the frustrum method only.

In normal limbs, mean ± s.d. limb volume using water displacement was 1802 ± 268 ml. Perometer values agreed almost exactly (1809 ± 262 ml, r = 0.97, variation ± 7% by limits of agreement) but both the disc (1923 ± 306 ml, r = 0.90, variation ± 14%) and frustrum (1905 ± 372 ml, r = 0.72 …