1 Preliminary remarks topenlarge
Type C fractures are complete articular fractures of the distal radius.
C3 type fractures involve a multifragmentary fracture of the articular surface. They are subdivided according to the extent of the metaphyseal fragmentation, varying from those involving only comminution of the articular surface with a simple metaphyseal fracture (C3.1), to those involving a multifragmentary metaphyseal fracture as well (C3.2), and the most complex, with multifragmentary fracture lines extending into the diaphysis (C3.3).
As these are intraarticular fractures, where possible, they should be treated with anatomic reduction and absolute stability in order to minimize the risk of subsequent degenerative changes in the joint.
Anatomical reduction and stabilization of these articular fractures is also essential because of the functional implications of the involvement of the distal radioulnar joint.
C3 fractures are among the most common fractures seen and treated in the older population, with underlying osteoporosis. When these fractures occur in younger individuals, they are more likely to be the result of high energy trauma, with associated soft-tissue, or skeletal injuries.
It is not possible to make an accurate assessment of the details of these injuries without a CT scan.
In cases of extreme comminution, where it is not felt possible to reconstruct the joint, a joint spanning bridge plate of the distal radial joint surface may be considered.
Reduction is achieved by applying longitudinal traction either manually or using Chinese finger traps.
The reduction is maintained by a temporary splint.
If definitive surgery is planned, but cannot be performed within a reasonable time scale, a temporary external fixator may be helpful.
2 Associated injuries topenlarge
Median nerve compression
If there is dense sensory loss, or other signs of median nerve compression, the median nerve should be decompressed.
Associated carpal injuries
These injuries may be associated with shearing injuries of the articular cartilage, scaphoid fracture and rupture of the scapholunate ligament (SL). Every patient should be assessed for this injury. If present, see carpal bones of the Hand module.
These injuries may be accompanied by avulsion of the ulnar styloid and/or disruption of the DRUJ. If there is gross instability after the fixation of the radial fracture, it is recommended that the styloid and/or the triangular fibrocartilaginous disc (TFC) is reattached (see A1.1). This is not common in simple fractures, but may occur with some high energy injuries.
The uninjured side should be tested as a reference for the injured side.
It may not be possible to assess DRUJ stability until the fracture has been stabilized (as described below).
3 Open reduction topenlarge
The main fragmetnts are reduced to reconstruct the distal radial joint surface as accurately as reasonably possible. The proximal carpal bones may be used as a template against which the fragments are reduced. A dental pick, K- wires or a small periosteal elevator are used for the reduction.
If there are fragments large enough to be secured with a K-wire, these may be used for limited fixation of the fracture.
4 Plate application topenlarge
A straight wrist fusion plate or a standard 3.5 plate is contoured and slightly bent to fit the dorsal side of the distal radius, the carpus and the third metacarpal, holding the wrist in slight extension.
The aim is to hold the carpus in the correct relationship to the radius for the multiple fragments to heal in a reasonable approximation to an anatomic position.
The plate is first fixed on the (third) metacarpal with a screw in the most distal plate hole.
The plate is aligned on the distal radius, with no more than 5 mm distraction at the radiocarpal joint, and held with a fracture reduction clamp.
The forearm is supinated approximately 30° and the reduction assessed.
If the fracture position and forearm rotations are satisfactory, three proximal screws are inserted and two further screw are inserted into the radial shaft.
If a locking plate is applied, locking head screws should be used.
The K wires may be removed at approximately six weeks, but the plate is left in place until bone healing has been confirmed radiologically, usually between three to four months.
It is then removed an active rehabilitation program is initiated.