Summary
This study aims to establish a normal database of carpal postero-anterior radiographic measurements that might be a useful alternative to lateral film measurements in clinical practice. Selected landmarks were digitised on 80 postero-anterior wrist radiographs of asymptomatic volunteers. Carpal bone dimensions, ulnar variance, carpal height ratios, radial slope and various carpal angles were computed. Moreover, we describe two new parameters, the scapho-lunate ratios, that may prove useful in the diagnosis of carpal instability. Average values for carpal height, length of metacarpal III, capitate length, ulnar variance, radial slope and classical and revised carpal height ratios agreed with previous findings. Scaphoid length averaged 22 ± 3 mm, lunate anterior and posterior horn lengths 11 ± 1 mm and 16 ± 2 mm respectively. Except for carpal height and length of metacarpal III, standard deviations did not exceed 3 mm. Some of the variation coefficients reached 30% of the average dimension, so that variations, compared to means were not negligible. The standard deviations of angular measurements ranged from 3° to 13°. Further investigations are needed to confirm the usefulness of scapho-lunate ratios.
Résumé
Cette étude présente une base de données normales des mesures radiographiques postéro-antérieures du poignet qui pourrait être une alternative utile aux mesures sur cliché en incidence latérale en pratique clinique. Des repères choisis ont été numérisés sur 80 radiographies en incidence postéro-antérieure du poignet de volontaires asymptomatiques. Les dimensions carpiennes, la variance ulnaire, les rapports de hauteur carpienne, la pente radiale et plusieurs angles carpiens ont été calculés. En outre, nous décrivons deux nouveaux paramètres, les rapports scapho-lunaires, qui pourraient s'avérer utiles dans le diagnostic de l'instabilité carpienne. Les valeurs moyennes de la hauteur carpienne, de la longueur du troisième métacarpien, de la longueur du capitatum, de la variance ulnaire, de la pente radiale et des rapports de hauteur carpienne étaient en accord avec les observations antérieures. La longueur du scaphoïde valait en moyenne 22 ± 3 mm, les longueurs des cornes ventrale et dorsale du lunatum 11 ± 1 mm et 16 ± 2 mm respectivement. Hormis la hauteur carpienne et la longueur du troisième métacarpien, les écarts-type n'excédaient pas 3 mm. Certains des coefficients de variation atteignaient 30% de la dimension moyenne, de sorte que les variations, par rapport aux moyennes, n'étaient pas négligeables. Les mensurations angulaires présentaient un écarttype compris entre 3 et 13°. Des investigations complémentaires sont nécessaires pour confirmer l'utilité des rapports scapho-lunaires.
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Feipel, V., Rinnen, D. & Rooze, M. Postero-anterior radiography of the wrist normal database of carpal measurements. Surg Radiol Anat 20, 221–226 (1998). https://doi.org/10.1007/BF01628899
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DOI: https://doi.org/10.1007/BF01628899