Relationships of Lung Volume to Height and Arm Span in Normal Subjects and in Patients with Spinal Deformity1,2

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Abstract
The relatively close correlation between arm span and height in normal men and women has again been confirmed. Therefore, it is desirable to substitute arm span measurements for measurements of height in order to predict more accuartely the normal lung volumes in patients whose height has been shortened by spinal deformity. Two approaches may be taken to the prediction of normal lung volumes in patients with spinal deformity: arm span measurements may by utilized directly in the formulas derived from the correlation of vital capacity and arm span; or arm span may be converted to the estimated normal heights and the latter used in whatever prediction formula is preferred,.