Radial ray anomaly
Congenitally deformed upper limbs with deviated hands bilaterally
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Complete absence of the radius bilaterally, with absent thumb on left side. Absence of multiple carpal bones bilaterally. Bowing hypoplastic ulna with poor support to wrist joint bilaterally, resulting in radial deviation and hyperflexion of both hands. Findings are suggestive of Type IV Radial Ray Anomaly.
2 case question available
Radial ray anomalies can be classified according to its severity into four main sub types :
- type I: slightly (>2 mm) short radius and sideways bending of hands at the wrist (often associated with a hypoplastic thumb); proximal radius is usually unaffected.
- type II: very short radius and sideway curving of ulna which supports the wrist poorly
- type III: partial absence of radius
- type IV: complete absence of radius
- 1. Pakkasjärvi N, Koskimies E, Ritvanen A, Nietosvaara Y, Mäkitie O. Characteristics and associated anomalies in radial ray deficiencies in Finland--a population-based study. Am J Med Genet A. 2013 Feb;161A(2):261-7. doi: 10.1002/ajmg.a.35707. Epub 2013 Jan 15.