Rotational alignment femoral sizing guide
AssigneeSmith & Nephew, Inc.
InventorRoger Ryan Dees, Jr.
Life of this patent
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Abstract
Embodiments of the present invention allow unlimited rotational alignment between two boundaries for alignment with anatomic landmarks while still referencing both posterior condyles for A/P sizing of the distal femur. In particular embodiments, the system provides at least one movable paddle that provides a reference point from the condyles so that the measuring assembly can be aligned to be parallel with the epicondylar axis. Once the measuring assembly is properly angled, the A/P length of the bone can then be measured from a proper reference point.
Claims15
A rotational alignment femoral sizing guide assembly, comprising:
- (a) a body comprising an upper surface, a lower surface, an anterior portion, a posterior portion, and an actuator member located on the upper surface of the body;
- (b) a stable condylar reference point or member on the body;
- (c) a movable condylar referencing member having an actuator member cooperating portion that cooperates with the actuator member of the body;
- and
- (d) a rotational actuator that cooperates with the actuator member of the body and the actuator member cooperating portion of the movable condylar referencing member to provide varying degrees of angulation between the movable condylar referencing member and the body, wherein the stable condylar reference point or member on the body and the movable condylar reference member reference independently from one another.
A method for measuring the rotation and size of a bone area, comprising:
- (a) providing an assembly comprising a body with a stable condylar reference member and a movable condylar referencing member adapted to cooperate with the body via an actuator, wherein the stable condylar reference point or member and the movable condylar reference member reference independently from one another, further comprising angle measuring markings located on one or more of the body, the one or more condylar referencing members, or the actuator;
- (b) placing the assembly on the bone to be measured;
- and
- (c) actuating the actuator to cause the body to rotate with respect to a reference point marked by the movable condylar referencing member.
Dependencies are inferred from the claim text.