Most fractures of the distal radius can be treated with volar locking plates (VLPs) including the majority (89.6%) of AO C3-type fractures.1 VLP has recently gained widespread acceptance as the primary option for the treatment of this trauma.2 However, dorsally displaced fractures accompanied by the following conditions are not easy to treat using a single VLP 3,4 : when a significant dorsal die-punch is present, which sometimes involves the displacement of the distal radioulnar joint (DRUJ); or when a volar fracture line is distal to the watershed line or associated with dorsal communicated fractures. In these situations, the ulnar corner fragment occasionally cannot be held by a VLP or the distal edge of VLP can impinge on flexor tendons and cause injury. The displaced dorsal wall is involved with an elevated large roof, a rotated rim fragment, or impaction of the articular surface, which may cause arthritis of the wrist, or irritation of extensor tendon. These displacements seemed to be difficult to correct by a single volar approach.
Keywords► dorsally displaced distal radius fractures ► low-profile dorsal locking plates ► surgical strategy and technique ► fracture type ► indication and clinical results
AbstractBackground The low-profile dorsal locking plating (DLP) technique is useful for treating dorsally comminuted intra-articular distal radius fractures; however, due to the complications associated with DLP, the technique is not widely used.Methods A retrospective review of 24 consecutive cases treated with DLP were done. Results All cases were classified into two types by surgical strategy according to the fracture pattern. In type 1, there is a volar fracture line distal to the watershed line in the dorsally displaced fragment, and this type is treated by H-framed DLP. In type 2, the displaced dorsal die-punch fragment is associated with a minimally displaced styloid shearing fracture or a transverse volar fracture line. We found that the die-punch fragment was reduced by the buttress effect of small L-shaped DLP after stabilization of the styloid shearing for the volar segment by cannulated screws from radial styloid processes. At 6 months after surgery, outcomes were good or excellent based on the modified Mayo wrist scores with no serious complications except one case. The mean range of motion of each type was as follows: the palmar flexion was 50, 65 degrees, dorsiflexion was 70, 75 degrees, supination was 85, 85 degrees, and pronation was 80, 80 degrees; in type 1 and 2, respectively. Conclusion DLP is a useful technique for the treatment of selected cases of dorsally displaced, comminuted intra-articular fractures of the distal radius with careful soft tissue coverage.