Intramedullary implant with proximal plate and method for its use
An orthopedic implant is specifically configured for use in osteotomies, in which part of the implant extends into an intramedullary portion of a first bone segment and a plate portion is external to the cortical surface of an adjacent bone segment to fix the segments to allow them to fuse. The body of the implant has a first end and a second end where the end which is inserted into the bone has a chamfer and a through hole having a hole axis optionally at an oblique angle to the longitudinal axis of the implant, and which can receive a screw, peg or pin. The second end of the implant includes a plate portion with at least two offset screws.
1. An implant for an osteotomy of an associated long bone, comprising:
a plate fastener and a body fastener;
a plate configured to cooperate with a cortical surface of a bone, and including one or more through holes suitable for receiving the plate fastener; and
a body having a chamfered first end and a second end joined by a continuous curved exterior surface with a through hole in the body that defines an angle for the body fastener that is perpendicular to the long axis of the body, configured to lodge within the intramedullary channel of a long bone so as to avoid rotation (i) within the channel and (ii) about the osteotomy site, the first end being tapered and the second end extending into the plate so as to form an integral two member implant.
2. An implant as set forth in claim 1 , wherein the first end includes a counterbore.
3. An implant as set forth in claim 1 , wherein the plate includes two through holes each arranged so as to receive at least one fastener.
4. An implant as set forth in claim 3 , wherein the through holes are locking through holes and the fasteners are locking fasteners.
5. An implant as set forth in claim 4 , wherein the plate is a separate portion of the implant that is joined to the body in advance of a surgery.
6. An implant as set forth in claim 5 , wherein the plate is offset from the long axis of the body.
7. An implant as set forth in claim 6 , further comprising a system having at least two plate portions.
8. An implant as set forth in claim 1 , wherein the through hole in the plate is offset from the long axis.
9. An implant as set forth in claim 1 , wherein the bottom surface of the plate defines a longitudinal axis and includes a radius of curvature defined along the longitudinal axis.
10. An implant as set forth in claim 9 , wherein the plate is defined by a portion of a cylinder.
11. A surgical procedure for a metatarsal bone comprising:
making at least one incision to a head of a metatarsal so as to form a 0.5-1.5 cm incision down a neck of the metatarsal;
translating the head of the metatarsal laterally;
reaming a proximal portion of the metatarsal so as to form a recess having a base in a intramedullary channel;
placing a k-wire in the metatarsal at the base of the recess and leaving the guide wire in position while an implant, having a body and a plate with a screw hole, into position over the guiding k-wire and into the intramedullary channel; and
inserting at least one screw through the screw hole in the plate and into the cortical surface of the metatarsal head.
12. The surgical procedure as set forth in claim 11 , wherein the body includes a through hole with a screw placed through the through hole.
13. An implant for an osteotomy of a long bone, comprising:
a plate configured to cooperate with a cortical surface, including one or more through holes arranged and configured for receiving a fastener; and
a body having a first end and a second end joined together by a curved exterior surface formed along a long axis, configured to lodge within an intramedullary channel of a long bone, the curved exterior surface including at least one of grooves, flutes and flanges that are arranged in parallel relation to one another so as to provide for inhibition of implant rotation within the bone, the first end being sharpened to facilitate insertion into the long bone and defining a threaded through hole adjacent to the sharpened portion of the first end and configured to receive a threaded fastener, wherein the second end extends into the plate so as to form an integral two member implant.
14. An implant for an osteotomy of a long bone comprising:
a first portion configured to cooperate with a cortical surface of a bone, and including at least one through hole; and
a cannulated body having a first end and a second end joined by a curved exterior surface formed along a long axis, configured to lodge within an intramedullary channel of a long bone, the curved exterior surface including at least one of grooves, flutes and flanges that spiral around the body and arranged in tapering, spaced circumferential relation to the cannulation so as to inhibit the implant from rotating within the bone, the first end being tapered to facilitate insertion into the long bone with a threaded through hole defined adjacent to the taper and configured to receive a threaded fastener, and the second end extending into the first portion so as to form an integral two member implant.