Absent Radius - Classification

Classification

Classification of radial dysplasia is practised through different models. Some only include the different deformities or absences of the radius, where others also include anomalies of the thumb and carpal bones. The Bayne and Klug classification discriminates four different types of radial dysplasia. A fifth type was added by Goldfarb et. al describing a radial dysplasia with participation of the humerus. In this classification only anomalies of the radius and the humerus are taken in consideration. James and colleagues expanded this classification by including deficiencies of the carpal bones with a normal distal radius length as type 0 and isolated thumb anomalies as type N.
Type N: Isolated thumb anomaly
Type 0: Deficiency of the carpal bones
Type I: Short distal radius
Type II: Hypoplastic radius in miniature
Type III: Absent distal radius
Type IV: Complete absent radius
Type V: Complete absent radius and manifestations in the proximal humerus