Modular fracture fixation plate system

1. A fracture fixation plate system for use on a long bone having a metaphysis and a diaphysis, comprising:

a) at least one end plate having a head portion for the metaphysis defining a plurality of fixation holes for receiving fixation elements that extend into the bone, a bone contacting first surface and an opposite second surface;

b) at least one fragment plate having a first end and a second end with a plurality of bone screw holes therebetween, wherein

said at least one end plate defines a socket that receives at least one end of said at least one fragment plate, a non-threaded oblong first hole in said second surface intersecting said socket, and a post formed within said socket and extending from a floor of the socket and away from said second surface and toward the bone on which said first surface is positioned, and

said at least one end of said fragment plate has a threaded second hole and a third hole, said at least one end is dimensioned to fit into said socket with said threaded second hole being at least partially aligned with said non-threaded first hole of said end plate and said third hole is dimensioned to receive said post; and

c) a set screw dimensioned to enter said non-threaded oblong first hole in said end plate and engage said threaded second hole in said fragment plate, wherein driving said set screw along its axis into said second hole causes longitudinal displacement of said end of said fragment plate relative to said end plate in a direction transverse to the axis of said set screw and results in forcing said post against a periphery of said third hole and rigidly locking the fragment plate into engagement with the end plate.

2. A system according to claim 1 , wherein:

said at least one end plate is a plurality of plates having head portions of different sizes,

said at least one fragment plate is a plurality of different length fragment plates,

said end plates and said fragment plates adapted to be mixed and matched and coupled to each other.

3. A system according to claim 1 , wherein:

said fixation holes are threaded to receive fixation elements which lock relative to said head portions of said at least one end plate.

4. A system according to claim 1 , wherein:

said end plate includes a stem angled relative to said head portion, and said socket and post are integrated into said stem.

5. A system according to claim 1 , wherein:

said socket and said at least one end of said fragment plate each have portions which are stepped in width and include flats along the lateral sides thereof.

6. A system according to claim 1 , wherein:

said end plate defines a non-threaded fourth hole intersecting the socket, and

said at least one end of said fragment plate has a threaded fifth hole, wherein when said fragment plate is mated with said end plate said threaded fourth hole is aligned with said non-threaded fifth hole.

7. A system according to claim 6 , wherein:

said non-threaded fourth hole is oblong.

8. A system according to claim 1 , wherein:

said fragment plate includes a threaded fourth hole defined by two spaced apart cantilevers.

9. The system according to claim 8 , further comprising:

c) a second screw dimensioned to enter said threaded fourth hole, wherein when said second screw is inserted into said threaded fourth hole, the rigidity of said fragment plate surrounding said threaded fourth hole is increased.

10. A system according to claim 1 , wherein:

said fragment plate includes a longitudinal midpoint, and for each bone screw hole, a threaded set screw hole is provided on a side of the bone screw hole closer to an end of the fragment plate than the midpoint.

11. A system according to claim 1 , wherein:

said head portion is sized and shaped for the distal volar radius bone.