has part has part characteristic of inheres in has modifier Abnormal morphology of the radius Radial ray deficiency Radial club hand Radial ray anomaly Abnormal radial ray morphology Dysplastic radii HP:0006420 Radial dysplasia, also known as radial longitudinal deficiency, includes radial clubhand and is a disfiguring, and potentially disabling, congenital limb anomaly. The entire upper limb may be involved, although the defect is most evident in the forearm and hand. Affected children suffer a variable degree of hypoplasia or absence of the preaxial skeleton and soft tissues, in particular the thumb, radius, and dorsoradial soft tissues. The hand is usually radially deviated and subluxated off the distal aspect of the ulna, the ulna may be shortened and have a bow-shaped deformity, and there is no true wrist (radiocarpal) joint in Bayne2 type-III and IV radial dysplasia. UMLS:C4025046 HP:0410049 HP:0006433 Bayne et al. classified radial ray deficiency into four types based on the radiographic severity of the radial ray deficiency: Type I, short distal radius (radius is slightly shorter than ulna, distal growth plate is present); Type II, hypoplastic radius (radius is smaller/thinner than ulna, no growth plate is present); Type III, partial absence of the radius (only a small proximal radial segment is present); and Type IV, total absence (radius is completely absent, ulna may be curved). HP:0004059 Radial longitudinal deficiency Deformity of radial ray Radial ray deformity Radial dysplasia abnormal dysplastic radius bone