Table 1 Modified Bayne classification of RLD
From: Hand function in children with radial longitudinal deficiency
Type | Thumb | Carpus | Distal radius | Proximal radius |
|---|---|---|---|---|
N | Hypoplastic or absent | Normal | Normal radius | Normal |
0 | Hypoplastic or absent | Absence, hypolasia or coalition | Normal radius | Normal, radio-ulnar synostosis or congenital dislocation of radial head |
I | Hypoplastic or absent | Absence, hypolasia or coalition | Radius > 2 mm shorter than ulna | Normal, radio-ulnar synostosis or congenital dislocation of radial head |
II | Hypoplastic or absent | Absence, hypolasia or coalition | Hypoplasia | Hypoplasia |
III | Hypoplastic or absent | Absence, hypolasia or coalition | Partial absence of the radius | Variable hypoplasia |
IV | Hypoplastic or absent | Absence, hypolasia or coalition | Absent | Absent |