Wedge opening osteotomy plate
View Patent ↗An orthopedic plate is designed for opening osteotomies and includes a contoured double tabbed or butterfly shaped plate portion which can accommodate selective fixation including locking, variable locking and non-locking. The plate also includes a centrally located osteotomy support that maintains the opening between bone segments at a spaced relationship. The support can be integral to the plate, or can be modular, i.e. a separate and adjustable segment which can be changed to accommodate the desired geometry of the osteotomy site.
1. An orthopedic opening osteotomy plate having a plate portion which has a butterfly shaped outline defining a long axis and a transverse short axis and exhibiting bilateral mirror symmetry about the short axis and comprising a central portion joined to a first pair and a second pair of longitudinally spaced tabs, the first pair of tabs on one side of the long axis and the second pair of tabs on the other side of the long axis, wherein the first set of longitudinally spaced tabs flank the second pair of longitudinally spaced tabs such that the respective tabs of each of the first and second pair of tabs are medially offset relative to each other, each of the tabs including a threaded screw hole having an axis, the plate further having a curve in the z direction about the long axis of the plate portion whereby the axes of the screw holes of the respective tabs on either side of the long axis converge but do not impinge and the plate further includes an osteotomy support that extends from the plate.
2. The orthopedic plate as set forth in claim 1 in which the osteotomy support is integral to the plate.
3. The orthopedic plate as set forth in claim 2 in which the osteotomy support comprises a block that extends from the plate transverse to the long axis of the plate portion.
4. The orthopedic plate as set forth in claim 3 in which the osteotomy support comprises a pair of flanges that further extend in the direction of the long axis of the plate portion and which define a channel therebetween.
5. The orthopedic plate as set forth in claim 3 in which the osteotomy support comprises a pair of flanges that further extend transverse to the direction of the long axis of the plate portion and which define a channel therebetween.
6. The orthopedic plate as set forth in claim 5 wherein the bend defines an angle between the flange members of between about 3° and about 15°.
7. The orthopedic plate as set forth in claim 1 in which the osteotomy support is modular to the plate.
8. The orthopedic plate as set forth in claim 7 in which the plate portion includes a central opening and the osteotomy support comprises a support member and a stop member where the stop member is captured in the central opening of the plate portion to join the osteotomy support to the plate portion.
9. The orthopedic plate as set forth in claim 8 in which the central opening includes a keyway having an opening with a wider diameter that opens to passage having a narrower diameter, and the stop includes a wider diameter member joined by a necked portion to the support member and the wider diameter member fits through the wider diameter opening in the central opening but not through the narrower diameter portion, and the necked portion is narrower than the narrower diameter passage so that the support can slide in the passage.
10. The orthopedic plate as set forth in claim 8 in which the osteotomy support comprises an ellipse.
11. The orthopedic plate as set forth in claim 8 in which the stop member further includes a high friction surface.
12. The orthopedic plate as set forth in claim 11 in which the high friction surface comprises teeth.
13. The orthopedic plate as set forth in claim 12 wherein the teeth are ratcheting teeth, and the central opening also forms an ellipse.
14. The orthopedic plate as set forth in claim 1 wherein the central portion of the plate includes a bend along the long axis in the z axis when viewed from the top.
15. The orthopedic plate as set forth in claim 14 wherein the length of the bend is limited to less than 75% of the length of the plate along the long axis.
16. The orthopedic plate as set forth in claim 15 wherein the length of the bend is limited to less than 66% of the length of the plate along the long axis.
17. The orthopedic plate as set forth in claim 15 wherein the length of the bend is limited to less than 50% of the length of the plate along the long axis.