Freeform tri-planar osteotomy guide and method
Systems and methods for performing an osteotomy are presented. Examples include forming a fusion osteotomy at a metatarsocuneiform joint of the first ray of a human foot.
1. An osteotomy system that facilitates performance of an osteotomy between a metatarsus and a cuneiform defining a metatarsocuneiform joint of a human foot, the osteotomy system comprising: an osteotomy guide comprising: a joint alignment feature that facilitates alignment of the osteotomy guide with the metatarsocuneiform joint via insertion of an element into the metatarsocuneiform joint; one or more fixation elements that facilitate fixation of the osteotomy guide to at least one of the metatarsus and the cuneiform; and a first guide feature, spaced apart from the joint alignment feature such that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint, the first guide feature is positioned to guide a first cutter to cut the metatarsus to remove part of the metatarsus, wherein the osteotomy guide further comprises a one-piece guide body shaped to define at least the first guide feature and a second guide feature, spaced apart from the joint alignment feature and the first guide feature.
2. The osteotomy system of claim 1 , wherein the one-piece guide body further defines the joint alignment feature, and the second guide feature that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint, is positioned to guide one of the first cutter and a second cutter to cut the cuneiform to remove part of the cuneiform.
3. The osteotomy system of claim 2 , further comprising a feeler gauge, separate from the one-piece guide body, that is insertable at least partially into a space of the metatarsocuneiform joint between the metatarsus and the cuneiform to align the osteotomy guide with the metatarsocuneiform joint;
wherein:
the first guide feature comprises a first slot;
the second guide feature comprises a second slot; and
each of the first slot and the second slot is sized to receive a cutting blade of at least one of the first cutter and the second cutter; and
the joint alignment feature comprises a third slot, positioned between the first slot and the second slot, that is sized to receive the feeler gauge.
4. The osteotomy system of claim 1 , wherein:
the one or more fixation elements comprise:
a first hole having a first axis that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint, passes through the metatarsus; and
a second hole having a second axis, parallel with the first axis that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint, passes through the cuneiform; and
the osteotomy system further comprises:
a first pin sized to be inserted through the first hole to penetrate the metatarsus; and
a second pin sized to be inserted through the second hole to penetrate the cuneiform.
5. The osteotomy system of claim 4 , wherein the osteotomy guide functions independently of any pin inserted through a hole with an axis nonparallel with the first axis and the second axis.
6. The osteotomy system of claim 1 , wherein the osteotomy guide further comprises one or more indexing features sized and shaped to abut a diaphysis of the metatarsus with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint;
wherein the one or more indexing features comprise:
a first planar surface positioned to abut the diaphysis; and
a second planar surface oriented nonparallel to the first planar surface and positioned to abut the diaphysis simultaneously with the first planar surface.
7. The osteotomy system of claim 1 , wherein the osteotomy guide further comprises a second guide feature that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint and with the first guide feature unobstructed, is positioned to guide one of the first cutter and a second cutter to cut the cuneiform to remove part of the cuneiform.
8. The osteotomy system of claim 1 , further comprising a second guide feature that, with the osteotomy guide positioned to align the joint alignment feature with the metatarsocuneiform joint, is positioned to guide one of the first cutter and a second cutter to cut the cuneiform to remove part of the cuneiform;
wherein the second guide feature is on a guide body comprising an outward flare positioned to accommodates a medial protuberance of the cuneiform when the osteotomy guide is fixed to a medial side of at least one of the metatarsus and the cuneiform.
9. An osteotomy system that facilitates performance of an osteotomy between a metatarsus and a cuneiform defining a metatarsocuneiform joint of a human foot, the osteotomy system comprising: an osteotomy guide comprising: a first guide feature positionable to guide a first cutter to cut the metatarsus to remove part of the metatarsus; and a second guide feature that, with first guide feature positioned to guide the first cutter to cut the metatarsus, is positioned to guide one of the first cutter and a second cutter to remove part of the cuneiform to create a gap between the metatarsus and the cuneiform; wherein the first guide feature and the second guide feature are on a one-piece guide body, wherein the one-piece guide body comprises an outward flare positioned to accommodates a medial protuberance of the cuneiform when the osteotomy guide is fixed to a medial side of at least one of the metatarsus and the cuneiform.
10. The osteotomy system of claim 9 , wherein the one-piece guide body further defines:
a first hole having a first axis that, with the first guide feature positioned to guide the first cutter to cut the metatarsus, passes through the metatarsus; and
a second hole having a second axis, parallel with the first axis that, with the first guide feature positioned to guide the first cutter to cut the metatarsus, passes through the cuneiform; and
the osteotomy system further comprises:
a first pin sized to be inserted through the first hole to penetrate the metatarsus; and
a second pin sized to be inserted through the second hole to penetrate the cuneiform.
11. The osteotomy system of claim 10 , wherein the osteotomy guide functions independently of any pin inserted through a hole with an axis nonparallel with the first axis and the second axis.
12. The osteotomy system of claim 9 , wherein the osteotomy guide further comprises one or more indexing features sized and shaped to abut a diaphysis of the metatarsus with the first guide feature positioned to guide the first cutter to cut the metatarsus;
wherein the one or more indexing features comprise:
a first planar surface positioned to abut the diaphysis; and
a second planar surface oriented nonparallel to the first planar surface and positioned to abut the diaphysis simultaneously with the first planar surface.
13. The osteotomy system of claim 9 , wherein, with the second guide feature positioned to guide the first cutter or the second cutter to remove part of the cuneiform, the first guide feature is unobstructed.
14. An osteotomy system that facilitates performance of an osteotomy between a metatarsus and a cuneiform defining a metatarsocuneiform joint of a human foot, the osteotomy system comprising: an osteotomy guide comprising: a first guide feature that is positionable to guide a first cutter to cut the metatarsus to remove part of the metatarsus; and a second guide feature that, with the first guide feature unobstructed and positioned to guide the first cutter to cut the metatarsus, is positioned to guide one of the first cutter and a second cutter to remove part of the cuneiform to create a gap between the metatarsus and the cuneiform, wherein the first guide feature is on a guide body comprising an outward flare positioned to accommodates a medial protuberance of the cuneiform when the osteotomy guide is fixed to a medial side of at least one of the metatarsus and the cuneiform.
15. The osteotomy system of claim 14 , wherein the osteotomy guide further defines:
a first hole having a first axis that, with the first guide feature positioned to guide the first cutter to cut the metatarsus, passes through the metatarsus; and
a second hole having a second axis, parallel with the first axis that, with the first guide feature positioned to guide the first cutter to cut the metatarsus, passes through the cuneiform; and
the osteotomy system further comprises:
a first pin sized to be inserted through the first hole to penetrate the metatarsus; and
a second pin sized to be inserted through the second hole to penetrate the cuneiform.
16. The osteotomy system of claim 15 , wherein the osteotomy guide functions independently of any pin inserted through a hole with an axis nonparallel with the first axis and the second axis.
17. The osteotomy system of claim 14 , wherein the osteotomy guide further comprises one or more indexing features sized and shaped to abut a diaphysis of the metatarsus with the first guide feature positioned to guide the first cutter to cut the metatarsus;
wherein the one or more indexing features comprise:
a first planar surface positioned to abut the diaphysis; and
a second planar surface oriented nonparallel to the first planar surface and positioned to abut the diaphysis simultaneously with the first planar surface.