# US 2014/0155902 A1 · Tibial Resurfacing System and Method

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- Number: US 2014/0155902 A1
- Document ID: US20140155902A1
- Status: Published application
- Kind: A1
- Application number: 14/133,943
- Filed: 2013-12-19
- Published: 2014-06-05
- Earliest claimed: 2006-07-17
- Assignees: Arthrosurface Incorporated
- Applicants: Arthrosurface, Inc.
- Inventors: George Sikora; Steven W. Ek
- Web page: https://patentgrep.com/patent/US20140155902A1

## CPC

- A61F 2/389: {Tibial components (A61F2/3868 takes precedence)}
- A61B 17/157: {Cutting tibia}
- A61B 17/1637: {Hollow drills or saws producing a curved cut, e.g. cylindrical (A61B10/025, A61B17/1695 take precedence)}
- A61B 17/1675: {for the knee}
- A61B 17/1764: {for the knee}
- A61B 2090/062: {penetration depth}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

An implant resection system for preparing an implant site to replace a defect in an articular surface of a first bone includes a guide configured to be coupled generally perpendicular to the first bone proximate to the defect. The guide includes a body portion defining a plurality of excision passageways. The excision passageways each define a generally cylindrical core pathway configured to extend generally perpendicular to the first bone which partially overlaps with an adjacent generally cylindrical core pathway. A projection associated with each of the plurality of the generally cylindrical core pathways defines a truncated cylindrical excision site extending through a portion of the articular surface. Each truncated cylindrical excision site partially overlaps with at least one adjacent truncated cylindrical excision site.

## Claims

### Claim 1

An implant system comprising an implant for replacing a defect in an articular surface of a bone, said implant including:
a load bearing surface having a contour substantially corresponding to a contour of the articular surface corresponding to an implant site in the bone; and
a bone facing surface including a first and a second truncated cylindrical protrusion extending along a length of said bone facing surface, wherein said first and said second truncated cylindrical protrusion are defined by a first and a second different truncated cylindrical projection.

### Claim 2 (depends on 1)

The implant system of claim 1, wherein said first and said second truncated cylindrical protrusion define a first and a second generally opposite side of said bone facing surface, respectively.

### Claim 3 (depends on 1)

The implant system of claim 1, wherein said first and said second truncated cylindrical protrusion have the same diameter.

### Claim 4 (depends on 1)

The implant system of claim 1, wherein said first and said second truncated cylindrical protrusion have the different diameters.

### Claim 5 (depends on 1)

The implant system of claim 1, wherein said first and said second truncated cylindrical protrusion are spaced apart such that said first and said second different truncated cylindrical projections do not overlap.

### Claim 6 (depends on 1)

The implant system of claim 1, further comprising at least one keel extending generally downwardly from said bone facing surface generally perpendicularly from said length.

### Claim 7 (depends on 1)

The implant system of claim 1, wherein said bone facing surface further comprises a plurality of relief cavities configured secure said implant to said bone.

### Claim 8 (depends on 1)

The implant system of claim 1, wherein said implant includes a “D” shaped cross-section.

### Claim 9 (depends on 1)

The implant system of claim 1, wherein said implant comprises an upper portion configured to be secured to a lower portion, said upper portion comprising said load bearing surface and said lower portion comprising said bone facing surface.

### Claim 10 (depends on 1)

The implant system of claim 1, wherein said implant is a unitary component.

### Claim 11 (depends on 10)

The implant system of claim 10, wherein said implant is made from ultra-high molecular weight polyethylene.

### Claim 12 (depends on 1)

The implant system of claim 1, wherein said load bearing surface has a concaved contour.

### Claim 13 (depends on 12)

The implant system of claim 12, wherein said implant has a height along a first side which is less than a height of a second side.

### Claim 14 (depends on 13)

The implant system of claim 13, wherein said first side is a medial side of said bone and said second side is a lateral side of said bone.

### Claim 15 (depends on 1)

The implant system of claim 1, wherein said first and said second truncated cylindrical protrusion generally extend along an anterior to posterior plane of said bone.

### Claim 16 (depends on 15)

The implant system of claim 15, wherein said bone is a tibia bone, and wherein said implant includes a modified “D” shaped cross-section including a notched region corresponding the posterior face of the tibia which is not removed proximate to a nerve bundle.

### Claim 17 (depends on 1)

The implant system of claim 1, further comprising a third truncated cylindrical protrusion along said length of said bone facing surface, said third truncated cylindrical protrusion partially overlapping said first and said second truncated cylindrical protrusions and being defined by a third truncated cylindrical projection different than said first and said second truncated cylindrical projections.

### Claim 18 (depends on 1)

The implant system of claim 1, further comprising a guide configured to be coupled generally perpendicular to said bone proximate to said defect, said guide comprising a body portion defining a first and a second excision passageway, said first and said second excision passageways each defining a generally cylindrical core pathway configured to extend generally perpendicular to said bone, wherein projections associated with said first and said second generally cylindrical core pathways corresponds to said first and second different truncated cylindrical projection and are adapted to define a first and a second truncated cylindrical excision site extending through a portion of said articular surface.

### Claim 19

An implant system comprising an implant for replacing a defect in an articular surface of a bone, said implant including:
a load bearing surface having a contour substantially corresponding to a contour of the articular surface corresponding to an implant site in the bone; and
a bone facing surface including a first and a second truncated cylindrical protrusion extending along a length of said bone facing surface and defining a first and a second generally opposite side of said bone facing surface, wherein said first and said second truncated cylindrical protrusion are defined by a first and a second different truncated cylindrical projection;
wherein said implant includes a “D” shaped cross-section.

### Claim 20

An implant system comprising an implant for replacing a defect in an articular surface of a patient's tibia bone, said implant including:
a load bearing surface having a contour substantially corresponding to a contour of the articular surface corresponding to an implant site in the bone; and
a bone facing surface including a first and a second truncated cylindrical protrusion extending along a length of said bone facing surface and defining a first and a second generally opposite side of said bone facing surface, wherein said first and said second truncated cylindrical protrusion are defined by a first and a second different truncated cylindrical projection;
wherein said implant includes a modified “D” shaped cross-section including a notched region corresponding the posterior face of the tibia bone which is not removed proximate to a nerve bundle.