Osteotomy guide

• US 20070083214A1
• Filed: 09/19/2005
• Published: 04/12/2007
• Est. Priority Date: 09/19/2005
• Status: Active Grant

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Vankoski, Stephen, Duncan, Clive, Cook, Laban, Krebs, Robert
• Granted Patent: US 7,582,091 B2
• Time in Patent Office: Days
• US Class Current: 606/102
• CPC Class Codes: A61B 17/15 Guides therefor arrangements for guiding straight saw blades in general B23D51/025

Abstract

An osteotomy guide for indicating the femoral neck resection on a femur and its method of use are presented. The osteotomy guide includes an indexing feature for aligning the guide with an anatomic landmark and a resection guide for indicating the resection relative to the indexing feature.

Claims

1. An osteotomy guide for indicating the femoral neck resection on a femur having a shaft, a neck extending from the shaft, and a head arising from the neck at the proximal end of the femur, the femoral shaft extending along an anatomic axis from its proximal end to its distal end, a greater trochanter defining the superior-lateral aspect of the femur, the neck and greater trochanter defining a trochanteric fossa between them, the osteotomy guide comprising:

a first indexing feature alignable with a first anatomic landmark;

a second indexing feature connected to the first indexing feature and alignable with a second anatomic landmark;

an extension extending from the first indexing feature; and

a resection guide connected to the extension and spaced from the first indexing feature for indicating the resection relative to the indexing features.

2. The osteotomy guide of claim 1 wherein the resection guide is mounted for rotation between a first position suitable for a left femur and a second position suitable for a right femur.

3. The osteotomy guide of claim 1 wherein the first indexing feature comprises an elongated handle alignable parallel to the anatomic axis of the femur outside of the femur.

4. The osteotomy guide of claim 3 wherein the second indexing feature comprises a probe alignable with an anatomic landmark.

5. The osteotomy guide of claim 4 wherein the probe extends posteriorly from the handle to engage the trochanteric fossa.

6. The osteotomy guide of claim 4 wherein the resection guide and probe are spaced from the handle by the extension extending from the handle at an angle such as to facilitate insertion of the resection guide and probe into an incision while maintaining the handle externally of the incision.

7. The osteotomy guide of claim 1 wherein the resection guide includes a reference surface for indicating a desired resection level on the femoral neck, the resection guide being mounted relative to the indexing features to position the reference surface in known relationship to the indexing features.

8. The osteotomy guide of claim 7 wherein the resection guide is angled to indicate the angle of the neck resection.

9. The osteotomy guide of claim 7 wherein the resection guide is mounted for selective movement between multiple positions relative to at least one of the indexing features.

10. The osteotomy guide of claim 9 wherein the resection guide includes markings to indicate the spacing of the resection guide from the at least one indexing feature in each of the multiple positions.

11. An osteotomy guide for indicating the femoral neck resection on a femur having a shaft, a neck extending from the shaft, and a head arising from the neck at the proximal end of the femur, the femoral shaft extending along an anatomic axis from its proximal end to its distal end, a greater trochanter defining the superior-lateral aspect of the femur, the neck and greater trochanter defining a trochanteric fossa between them, the osteotomy guide comprising:

an elongated handle;

an outrigger extending at an angle from the handle;

a paddle mounted on the outrigger for indicating the resection level; and

a probe extending beyond the paddle and being engageable with the trochanteric fossa.

12. The osteotomy guide of claim 11 wherein the outrigger extends at an angle of approximately 90 degrees such that with the handle positioned on the anterior side of the femur and positioned parallel to the femoral axis, the outrigger extends posteriorly toward the hip joint.

13. The osteotomy guide of claim 11 wherein the paddle is mounted to the osteotomy guide for vertical translation relative to the probe

14. The osteotomy guide of claim 13 further comprising a locking mechanism for selectively preventing vertical translation of the paddle relative to the probe.

15. The osteotomy guide of claim 14 wherein the locking mechanism comprises a thumb screw threaded into a first hole communicating with the opening such that by tightening the thumb screw against the first leg the paddle is locked in a fixed position relative to the probe.

16. The osteotomy guide of claim 15 wherein the locking mechanism includes a second hole, opposite the first hole, communicating with the opening such that the thumb screw may be alternatively positioned in the first and second holes to accommodate left and right handed users.

17. The osteotomy guide of claim 11 wherein the paddle includes a first leg and a second, the first and second legs defining an angle, the second leg having a top surface defining a reference surface spaced a known distance from the probe

18. The osteotomy guide of claim 17 wherein the angle between the first and second legs is approximately 45 degree.

19. The osteotomy guide of claim 17 wherein the first leg further including a scale that indicates the vertical spacing of the reference surface relative to the probe.

20. The osteotomy guide of claim 17 wherein the first leg slides within an opening in the outrigger.

21. The osteotomy guide of claim 20 wherein the first leg and opening have complimentary non-round cross sections such that the paddle is constrained to vertical translation within the housing.

22. The osteotomy guide of claim 20 wherein the paddle includes a notch, the notch permitting the paddle to be rotated 180 degrees when the paddle is raised such that the notch clears the top of the opening.

23. The osteotomy guide of claim 22 wherein the paddle further comprises tabs extending outwardly from the top of the first leg, the tabs engaging the guide adjacent the opening to prevent the paddle from sliding out of the opening.

24. The osteotomy guide of claim 23 wherein the paddle further comprises notches formed inboard of the tabs and extending from the top of the first leg downwardly such that the tabs are cantilevered and can be sprung inwardly to allow the paddle to be removed from the opening.

25. A method for determining the resection level for the femoral neck in hip surgery on a femur having a shaft, a neck extending from the shaft, and a head arising from the neck at the proximal end of the femur, the femoral shaft extending along an anatomic axis from its proximal end to its distal end, a greater trochanter defining the superior-lateral aspect of the femur, the neck and greater trochanter defining a trochanteric fossa between them, the method comprising:

providing an osteotomy guide having a first indexing feature alignable with a first anatomic landmark, a second indexing feature connected to the first indexing feature and alignable with a second anatomic landmark, an extension extending from the first indexing feature, and a resection guide connected to the extension and spaced from the first indexing feature for indicating a resection level relative to the indexing features;

inserting the second indexing feature and resection guide into a surgical opening;

engaging the second indexing feature with the trochanteric fossa;

aligning the first indexing feature parallel to the anatomic axis of the femur outside of the surgical opening; and

cutting the femoral neck at the resection level indicated by the resection guide.

26. The method of claim 25 further comprising marking the femoral neck for a subsequent cut.

27. The method of claim 25 wherein cutting the femoral neck comprises using the resection guide to guide a cutter.

28. The method of claim 25 wherein providing an osteotomy guide comprises adjusting the relationship between the indexing features and the resection guide to match a predetermined distance from the trochanteric fossa to the desired neck resection.