Fig. 4

A. A type B1 fracture with a smaller distal fragment and oblique fracture line. The transverse K-wire (a) prevents radioproximal redisplacment of fragment and radioproximal wire shift. The arrow shows the direction that the fragment and K-wire tend to displace. B. A type A2 fracture with a volar displaced fragment is reduced and fixed. The proximal transverse K-wire (a) and oblique K-wire (b) prevent the fragment rotated volarly. The arrow shows the direction that the fragment and K-wire tend to displace. C. A type A3 fracture with a dorsally displaced fragment is reduced and fixed. The K-wires (a and b) prevent the fragment rotated dorsally. The arrow shows the direction that the fragment and K-wire tend to displace