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 guidance system for hallux valgus correction, 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;
a second guide mountable on the first guide, the second guide slidably translatable in a transverse direction relative to the first axis; and
a third guide mountable on the second guide such that the third guide is translatable along a curved path extending at least part way around the longitudinal axis.
2. The guidance system for hallux valgus correction of claim 1 , wherein the third guide has a lock for fixing a position of the third guide along the curved path.
3. The guidance system for hallux valgus correction of claim 2 , wherein the lock comprises a threaded post or a spring loaded device.
4. The guidance system for hallux valgus correction of claim 2 , wherein the lock comprises a threaded post, and further wherein the second and third guides include plates configured to receive the threaded post extending through respective slots in the second and third guides.
5. The guidance system for hallux valgus correction of claim 4 , wherein the plates of the second and third guides further define at least one aperture for receiving a fixation element therethrough.
6. The guidance system for hallux valgus correction of claim 4 , wherein the plate of the third guide is curved.
7. The guidance system for hallux valgus correction of claim 1 , wherein the first guide has a first planar surface perpendicular to the first axis, and the second guide has a second planar surface arranged to slide in the transverse direction relative to the first planar surface.
8. The guidance system for hallux valgus correction of claim 1 , further comprising a fourth guide attachable to the first guide, the fourth guide defining an aperture for receiving a fixation element aligned with a second portion of the bone.
9. The guidance system for hallux valgus correction of claim 8 , wherein the fourth guide has a slot continuous with the aperture of the fourth guide, wherein the slot is configured for removal of the fourth guide from the first guide and the fixation element while the fixation element is inserted in the second portion of the bone.
10. The guidance system for hallux valgus correction of claim 1 , further comprising a cut guide attachable to the first guide, the cut guide having a slot for receiving a cutting tool configured to separate a second portion of the bone from the first portion of the bone.
11. The guidance system for hallux valgus correction of claim 1 , 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.