Guidance system for hallux valgus correction
A guidance system comprises a first guide configured to be detachably mounted to a first portion of a bone. The first guide has a first axis for alignment with a longitudinal axis of the first portion of the bone. A second guide is mountable on the first guide. The second guide is slidably translatable in a transverse direction relative to the first axis. A third guide is mountable on the second guide. The third guide is selectively positionable along a curved path extending at least part way around the longitudinal axis.
1. A method for using a guidance system, comprising:
fixing a first guide to a bone;
cutting the bone to provide a first bone portion and a second bone portion, the first bone portion having a first longitudinal axis, wherein a first axis of the first guide is aligned with the first longitudinal axis;
mounting a second guide to the first guide, wherein the second guide is slidably translatable at a selected position relative to the first guide along a transverse direction normal to the first longitudinal axis;
mounting a third guide to the second guide such that the third guide is translatable along a curved path extending at least part way around the first longitudinal axis; and
moving the third guide around the first longitudinal axis to rotate the second portion of the bone to a target angle relative to the first portion of the bone.
2. The method of claim 1 , wherein the third guide includes a plate defining a slot therein, and the method further comprises sliding the third guide relative to a post extending through the slot.
3. The method of claim 2 , further comprising inserting at least one fixation device through an aperture in the third guide and into the second portion of the bone.
4. The method of claim 1 , further comprising sliding the second guide along a transverse edge of the first guide, and locking the second guide to the first guide.
5. The method of claim 1 , further comprising:
attaching a fourth guide to the first guide;
inserting a fixation device through the fourth guide and into the first and second portions of the bone in a direction having a longitudinal component, the longitudinal component parallel to a second longitudinal axis of the second bone portion.
6. The method of claim 5 , further comprising removing the fourth guide by moving the fourth guide in a transverse direction relative to a third longitudinal axis of the fixation device.
7. The method of claim 6 , wherein the fixation device is a rod or wire and the fourth guide has a longitudinal slot through which the fixation device extends, the method further comprising inserting the fixation device through the longitudinal slot, the method further comprising moving the fourth guide so the fixation device passes out through the longitudinal slot in a direction transverse to the second longitudinal axis of the second bone portion.
8. The method of claim 1 , further comprising attaching a cut guide to the first guide, and cutting the bone through the cut guide.
9. A guidance system, comprising:
a first guide configured to be detachably mounted to a first portion of a bone, the first guide having a first axis for alignment with a longitudinal axis of the first portion of the bone and a first planar surface arranged in perpendicular relation to the first axis;
a second guide mountable on the first guide, the second guide movable in a transverse direction relative to the first axis and having a second planar surface arranged to slide transversely relative to the first planar surface; and
a third guide mountable on the second guide with the third guide being selectively translatable along a path around the longitudinal axis.
10. The guidance system of claim 9 , wherein the third guide has a lock for fixing a position of the third guide along the curved path.
11. The guidance system of claim 10 , wherein the lock comprises a threaded post or a spring loaded device.
12. The guidance system of claim 10 wherein the lock comprises a threaded post, and further wherein the second and third guides each include a plate configured to receive the threaded post.
13. The guidance system of claim 12 , wherein the plates of the second and third guides each further define at least one aperture for receiving a fixation element therethrough.
14. The guidance system of claim 12 , wherein the plate of the third guide is curved.
15. The guidance system of claim 9 , further comprising a fourth guide attachable to the first guide, the fourth guide defining an aperture for receiving a fixation element aligned with the second portion of the bone.
16. The guidance system of claim 15 , wherein the fourth guide has a slot continuous with the aperture of the fourth guide.
17. The guidance system of claim 9 , further comprising a cut guide attachable to the first guide, the cut guide having a slot for receiving a cutting tool.
18. The guidance system of claim 10 , wherein:
the first guide is a T-shaped member having apertures for receiving fixation elements and a planar surface, rail or channel for guiding the second guide;
the second guide includes a plate configured to move in a tangential direction along the surface, rail or channel; and
the third guide is a curved plate having a slot therethrough, the guidance system further comprising a threaded post or a spring loaded device extending through the slot of the third guide, for locking the third guide relative to the second guide.