Howmedica Osteonics Corporation

Michael Florentino

Michael A McGovern

An improvement in a trialing system and method for use in connection with the implant of a prosthetic joint component having a first part for engaging bone at an implant site to secure the component at the implant site, and a second part for enabling articulation of the prosthetic joint. A trial first member corresponds to the first part of the component, a trial second member corresponds to the second part of the component, and an offset adapter facilitates selective coupling and uncoupling of the trial first member and the trial second member with the trial second member offset from the trial first member and placed at a selected angular orientation relative to the offset adapter. Thus, during a trialing procedure the trial second member is selectively released readily for replacement of the trial second member with alternate trial second members, and replacement of the offset adapter with alternate offset adapters, as well as facilitating the selected angular orientation of a trial second member relative to an offset adapter, as required in order to expedite an accurate trialing procedure.

Trialing system and method utilizing offset

An angle measurement device is provided for determining the version angle for the prosthetic humeral head during shoulder replacement surgery. The device has a first collar for contacting the forearm and has a first coupling element in the form of a rod aligned with the ulna. The device has a second collar for contacting the upper arm when the elbow is flexed to 90&#xb0;. The second collar has a second coupling element coupled thereto extending in a direction generally perpendicular to the humerus. The second coupling element is pivotally coupled to the first coupling element for rotation about a pivot point axis. An angle indicator having angle indicia is located at said pivot point and fixed to one of said first or second arm contacting collars for indicating the angle between the ulna and the humerus during external rotation of the forearm.

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Ocean Grove, NJ, United States of America

Michael Florentino