Anatomical distal radius fracture fixation plate
View Patent ↗A fixation plate includes a set of threaded peg holes adapted to individually receive fixation pegs therethrough and non-threaded alignment holes having a relatively smaller diameter than the peg holes and preferably sized to closely receive a K-wire. The alignment holes are located between the peg holes. One peg hole is configured for aligning the plate during an osteotomy procedure, while other peg holes are configured for use after fracture reduction and receive K-wires to temporarily secure the plate to the bone and determine whether pegs inserted through adjacent respective peg holes will be properly located before drilling relatively larger holes for such pegs.
1. A fixation plate for use with a plurality of fixation pegs having threaded heads and a K-wire, comprising:
a substantially rigid plate defining a first set of peg holes each structurally adapted to engage the threaded head of one of the fixation pegs, and a non-threaded first alignment hole, each of said peg holes having a first diameter, and said first alignment hole having a second relatively smaller diameter sized to closely receive the K-wire in a predetermined axial orientation which is oblique relative to a bone contacting surface of said plate immediately surrounding said alignment hole, said first alignment hole being located within proximal-distal and medial-lateral boundaries defined between edges of two adjacent peg holes,
said rigid plate has a proximal end and a distal end, and said two adjacent peg holes each have a circumference and a distalmost point located on said circumference, and
said first alignment hole having a circumference and a distalmost point located on said circumference at which a tangent line is defined that is substantially parallel to a line tangent to said distalmost points on said circumferences of said two adjacent peg holes of said first set of peg holes.
2. A fixation plate according to claim 1 , wherein:
said plate has a body and a head, with said head angled upward relative to said body, and said first set of peg holes is provided in said head.
3. A fixation plate according to claim 2 , wherein:
said head has a lower surface, and said lower surface is non-planar.
4. A fixation plate according to claim 2 , wherein:
said head includes medial and lateral sides, and said medial side extends distally extended relative to said lateral side.
5. A fixation plate according to claim 2 , wherein:
said head includes a second set of peg holes having means to engage fixation pegs with threaded heads, said first set being longitudinally arranged, said second set being longitudinally arranged, and said second set being longitudinally offset relative to said first set.
6. A fixation plate according to claim 5 , wherein:
said head includes a distal non-threaded alignment hole between two adjacent pegs holes of said second set of peg holes.
7. A fixation plate according to claim 6 , wherein:
said distal alignment hole has an upper circular opening and a lower laterally oblong opening.
8. A fixation plate according to claim 2 , wherein:
said head and body together generally form a T-shaped plate configuration, and said head includes a lower surface, a lateral side, a medial side and a central portion, and said lower surface at said lateral and medial sides is directed upward relative to said lower surface at said central portion.
9. A fixation plate according to claim 1 , wherein:
each of said peg holes is structurally adapted to engage a fixation peg by including an internal thread.
10. A fixation plate according to claim 1 , wherein:
for n peg holes in said first set, a substantially linear arrangement of n−1 first alignment holes is provided, said peg holes and said first alignment holes provided in an alternating arrangement.
11. A fixation plate for use with a plurality of fixation pegs each having a shaft and a threaded head, and a K-wire, comprising:
a substantially rigid plate having a body and a head, with said head angled upward relative to said body, said head defining a first set of laterally displaced peg holes each structurally adapted to engage the threaded head of one of the fixation pegs, and a first non-threaded alignment hole substantially smaller in diameter than said peg holes and laterally displaced between two adjacent peg holes of said first set of peg holes wherein said first alignment hole is located within proximal-distal and medial-lateral boundaries defined between edges of two adjacent peg holes, each peg hole having a circumference and a distalmost point located on said circumference, such that a distalmost point on a circumference of the alignment hole defines a tangent line substantially parallel to a line tangent to said distalmost points on said circumferences of said two adjacent peg holes of said first set of peg holes, said first non-threaded alignment hole sized to closely receive the K-wire in a predetermined axial orientation which is oblique relative to a bone contacting surface of said plate immediately surrounding said alignment hole.
12. A fixation plate according to claim 11 , wherein:
said head defines a second set of peg holes each structurally adapted to engage the threaded head of one of the fixation pegs, wherein said first set is arranged substantially along a first line, and said second set is arranged substantially along a second line, and said first and second lines are longitudinally displaced relative to each other, said head further including a second non-threaded alignment hole substantially smaller in diameter than each peg hole of said second set of peg holes and laterally displaced between two peg holes of said second set of peg holes, said second non-threaded alignment hole sized to closely receive the K-wire in a predetermined axial orientation which is oblique relative to said bone contacting surface of said plate immediately surrounding said alignment hole.
13. A fixation plate according to claim 11 , wherein:
said first set of peg holes and said first alignment hole are all obliquely orientated in two dimensions relative to each other.
14. A fixation plate according to claim 11 , wherein:
said plate said first alignment hole has an upper circular opening and a lower laterally oblong opening.
15. A fixation plate according to claim 11 , wherein:
said at least one first alignment hole defines a tangent line which is substantially coincident with a line tangent to one of threaded peg holes.
16. A fixation plate according to claim 11 , wherein:
said head defines a distal taper.
17. A fixation plate according to claim 11 , wherein:
said plate includes a second alignment hole, and said at least one first alignment hole and second alignment hole are longitudinally displaced along said head.
18. A fixation plate according to claim 11 , wherein:
said body of said plate defines a shaft having a plurality of screw holes.
19. A fixation plate according to claim 11 , wherein:
a longitudinal axis through said plate extends through said first non-threaded alignment hole.
20. A fixation plate for use with a plurality of fixation pegs having threaded heads and a K-wire, comprising:
a substantially rigid plate having a shaft that longitudinally extends between proximal distal ends, and a head oriented relatively transverse to said shaft and located at said distal end of said shaft,
a plurality of peg holes located in said head, each structurally adapted to engage the threaded head of one of the fixation pegs, each of said peg holes having a first diameter and defining a circumference and a distalmost point on said circumference,
a non-threaded first alignment hole in said head, said first alignment hole having a second relatively smaller diameter than said first diameter and sized to closely receive the K-wire in a predetermined axial orientation which is oblique relative to a bone contacting surface of said plate immediately surrounding said alignment hole, said first alignment hole being located within proximal-distal and medial-lateral boundaries defined between edges of two adjacent peg holes of said plurality of peg holes, said first alignment hole having a circumference which has a distalmost point thereon and a tangent line to said distalmost point on said circumference of said first alignment hole is substantially parallel to a line tangent to said distalmost points on said circumferences of said two adjacent peg holes, and
a non-threaded second alignment hole in said head, said second alignment hole having an upper circular opening with said second diameter, and a lower laterally oblong opening that opens wider in a medial to lateral dimension than in a proximal to distal dimension that is relatively transverse to the medial to lateral dimension, said second alignment hole constraining a predetermined axial orientation of the K-wire in one dimension and permitting relative displacement of the plate and K-wire in a transverse dimension.
21. A fixation plate according to claim 20 in combination with said K-wire, wherein said K-wire has an outer diameter substantially corresponding to said second diameter.