Devices and methods for performing knee arthroplasty

Patent metadata

Field	Value
Publication number	US-9433425-B2
Application number	US-201213661470-A
Country	US
Kind code	B2
Filing date	Oct 26, 2012
Priority date	Oct 27, 2011
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Methods and devices for performing knee arthroplasty including but not limited to bicruciate retaining knee arthroplasty are provided. Methods and devices for preparing a proximal tibia for a tibial implant are also provided. These methods and devices, in at least some embodiments and uses, facilitate decreasing the complexity of knee arthroplasty procedures such as bicruciate retaining procedures while maintaining, if not improving on, the safety, accuracy and/or effectiveness of such procedures.

First claim

What is claimed is:

1. Instrumentation for performing arthroplasty on a knee joint including a proximal tibia, comprising:
a datum instrument configured to provide a reference foundation to which other devices or instruments are releasably attached, comprising:
a main body configured for attachment to the proximal tibia, the main body including an elongate slot extending therethrough in an anterior-posterior direction and having a slot length extending generally in a superior-inferior direction; and
a reference bench extending from the main body and configured for releasable engagement with at least one other device or instrument adapted for performing arthroplasty on the knee joint; and

a provisional attachment pin including a distal bone anchoring portion and a proximal portion, the provisional attachment pin extending through the elongate slot in the main body of the datum instrument with the distal bone anchoring portion anchorable within bone and the proximal portion positioned within the elongate slot to provisionally attach the datum instrument to the proximal tibia, the proximal portion of the provisional attachment pin slidably engaged within the elongate slot to adjust the position and/or orientation of the datum instrument relative to the proximal tibia prior to terminal attachment of the datum instrument to the proximal tibia.

2. The instrumentation of claim 1 , wherein prior to terminal attachment of the datum instrument to the proximal tibia the datum instrument is translatable along the provisional attachment pin in a superior-inferior direction to adjust a superior-inferior position of the reference bench, rotatable about the provisional attachment pin in a medial-lateral direction to adjust a varus-valgus angle of the reference bench, and rotatable along a length of the provisional attachment pin in an anterior-posterior direction to adjust an anterior-posterior slope angle of the reference bench.

3. The instrumentation of claim 1 , wherein the proximal end portion of the provisional attachment pin includes an enlarged head having a transverse cross section sized larger than a width of the elongate slot in the main body of the datum instrument to prevent disengagement of the datum instrument from the provisional attachment pin.

4. The instrumentation of claim 1 , wherein the provisional attachment pin includes external threads along the distal bone anchoring portion configured for anchoring in bone tissue, and wherein the proximal end portion includes one or more drive features configured to drive the distal bone anchoring portion into the bone tissue.

5. The instrumentation of claim 1 , further comprising at least one terminal attachment pin configured to terminally attach the datum instrument to the proximal tibia, the terminal attachment pin including a distal bone anchoring portion and a proximal portion;
wherein the main body of the datum instrument includes at least one pin-receiving opening extending therethrough generally in an anterior-posterior direction;
wherein the terminal attachment pin extends through the pin-receiving opening in the main body of the datum instrument with the distal bone anchoring portion anchorable within bone and the proximal portion positioned within the pin-receiving opening to terminally attach the datum instrument to the proximal tibia; and
wherein the pin-receiving opening and the terminal attachment pin are oriented at an oblique angle relative to the elongate slot and the provisional attachment pin.

6. The instrumentation of claim 1 , further comprising a plurality of the terminal attachment pins configured to terminally attach the datum instrument to the proximal tibia, the terminal attachment pins each including a distal bone anchoring portion and a proximal portion;
wherein the main body of the datum instrument includes a plurality of pin-receiving openings extending therethrough generally in an anterior-posterior direction; and
wherein the terminal attachment pins extend through respective ones of the pin-receiving openings in the main body of the datum instrument with the distal bone anchoring portions anchorable within bone and the proximal portions positioned within the pin-receiving openings to terminally attach the datum instrument to the proximal tibia; and
wherein each of the pin-receiving openings and the terminal attachment pins are oriented at an oblique angle relative to the elongate slot and the provisional attachment pin.

7. The instrumentation of claim 1 , wherein the reference bench comprises a plate portion including substantially planar superior and inferior surfaces arranged generally parallel with one another.

8. The instrumentation of claim 1 , further comprising a cutting guide instrument configured for releasable engagement with the reference bench, the cutting guide instrument including at least one cutting guide surface extending along a cutting plane and structured to guide a cutting device generally along the cutting plane to facilitate formation of a resection cut in the proximal tibia.

9. The instrumentation of claim 8 , wherein the reference bench includes a first substantially planar cutting guide surface and the cutting guide instrument includes a second substantially planar cutting guide surface, the first and second cutting guide surfaces spaced apart from one another to define a cutting guide channel therebetween extending along the cutting plane when the cutting guide instrument is releasably engaged to the reference bench, the cutting guide channel dimensioned to guide the cutting device generally along the cutting plane to facilitate formation of the resection cut in the proximal tibia.

10. The instrumentation of claim 9 , wherein the cutting guide instrument is releasably engaged to the reference bench by a compression lock mechanism incorporated into the main body.

11. The instrumentation of claim 10 , wherein the cutting guide instrument includes a mounting flange positioned between the main body and the reference bench of the datum instrument, the mounting flange compressingly engaged against the reference bench by the compression lock mechanism to releasably attach the cutting guide instrument to the datum instrument.

12. The instrumentation of claim 1 , further comprising at least one other device or instrument configured for performing arthroplasty on the knee joint, the at least one other device or instrument including a mounting flange positioned between the main body and the reference bench of the datum instrument, the mounting flange compressingly engaged against the reference bench by a compression lock mechanism incorporated into the main body to releasably attach the at least one other device or instrument to the datum instrument.

13. The instrumentation of claim 1 , wherein the datum instrument further comprises a compression lock mechanism incorporated into the main body and operable to releasably lock the at least one other device or instrument to the reference bench.

14. The instrumentation of claim 13 , wherein the compression lock mechanism comprises a gripper member movably engaged with a lever actuator member, the lever actuator member pivotally engaged to the main body, the gripper member transitioned between locked and unlocked configurations in response to pivotal displacement of the lever actuator member relative to the main body.

15. The instrumentation of claim 13 , wherein the compression lock mechanism comprises a gripper member movably engaged with a threaded actuator member, the threaded actuator member threadedly engaged to the main body, the gripper member transitioned between locked and unlo

Assignees

• Smith & Nephew Inc

Inventors

• Wilkinson Zachary Christopher

Classifications

• A61F2/4684

  Trial or dummy prostheses · CPC title

• A61B17/16

  Instruments for performing osteoclasis; Drills or chisels for bones; Trepans {(arthroscopic bone cutters A61B17/320016)} · CPC title

• A61F2002/4658

  for measuring dimensions, e.g. length · CPC title

• A61B17/17

  Guides {or aligning means} for drills {, mills, pins or wires} · CPC title

• A61B17/1604

  Chisels; Rongeurs; Punches; Stamps · CPC title