Measurement of ulnar translation and carpal height.

Ulnar translation, carpal height and carpal collapse are methods of measurement described by Youm, by Chamay and by DiBenedetto. The accuracy of these methods has been statistically examined using 65 normal X-rays. The lines of measurement were correlated with each other and more lines were sought to demonstrate better correlation. The validity of these methods was tested on 40 X-ray films from rheumatoid patients. The greater accuracy of the recommended lines of measurement was confirmed.