- See:
-
DCP and LC-DCP, 3.5 mm
-
DCP, 4.5 mm
-
LC-DCP, 4.5 mm in Pure Titanium:
- Discussion:
- compression is appied by eccentric insertion of
screws;
- slot for compression has a sloping surface at one end;
- when the spherical head of the screw impinges on this surface, plate moves
away from the fracture, thereby compressing fracture plane;
- if more compression is necessary, subsequent
screws may be inserted in
compression mode, but it is rarely necessary for more than two
screws to be loaded;
- when additional compression is added, the tension on initially
inserted
screws must be released by backing off 1-2 turns;
- each scew is then tightened in turn when all screws have been inserted;
- usage of two load
screws in the main fragments for axial compression;
- after one scew has been inserted in load position in each main fragment,
producing 1 mm of displacement, horizontal track in main fragment
still permits 1.8 mm of displacement;
- second screw, therefore, can be inserted in the next hole w/o being
blocked by the first screw;
- first screw, however, must be slightly loosened before further
1 mm compression can be produced by the second screw;
- note: that the first screw is inserted in the fragment whose spike is
farthest from the plate;
- following this, after axial compression is applied, oblique lag
screw is inserted for interfragment compression;
- follwing placement of at least two
screws on each side of frx,
(4 cortices on each side of the fracture), a screw should be placed
thru one cortex only in the most proximal and distal palte holes;
- this prevents a stress riser;
- note: stratedgy for plating frx may be dictated by frx configuration
- transverse fractures are stronger in compression than oblique frx
- oblique fractures are stronger in rotation than transverse frx;
