Modular center pegged glenoid
AssigneeBiomet Manufacturing, LLC
InventorsBrian K. Berelsman, Russell M. Parrott, Bryce A. Isch
Life of this patent
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Abstract
A glenoid component used for shoulder arthroplasty is adapted to be implanted into a scapula and engaged by a head of a humeral component. The glenoid component includes a body having a first articulating surface and a second medial surface opposite to the first articulating surface. The first articulating surface is adapted to engage with a humeral head. A plurality of fixed pegs each have a first end adapted to engage a cavity formed in the scapula and a second end extending from the medial surface. A central peg fixation mechanism is provided that is configured to couple an optional central fixation peg to the medial surface.
Claims24
A system for use during shoulder arthroplasty, said system having a glenoid component adapted to be implanted into a scapula and engaged by a head of a humeral component, said glenoid component comprising:
- a body having a first articulating surface and a second medial surface opposite said first articulating surface, said first articulating surface adapted to be engaged by a humeral head and said second medial surface adapted to be secured to the scapula, a generally cylindrical coupling mechanism protruding from said second medial surface, said coupling mechanism having a first flat bearing surface;
- a metal bushing integrally molded within the coupling mechanism, said metal bushing defining a threaded central bore;
- at least one fixed peg, each of said fixed pegs having a first end adapted to engage a cavity formed in the scapula and a second end extending from said medial surface;
- and
- a removable central stem, said central stem further having a second exterior flat bearing surface, the second exterior flat bearing surface configured to interface with the first flat bearing surface when the removable central stem is engaged with the threaded central bore before the body is engaged with the scapula, said central stem being configured to be non-rotatably engaged with a hole defined in the scapula.
A system for use in shoulder arthroplasty, said system having a glenoid component adapted to be implanted into a scapula, said system comprising:
- a body having a first articulating surface and a second medial surface opposite said first articulating surface, said second medial surface adapted to be secured to the scapula;
- a central cylindrical stem coupling mechanism having a fixed metal bushing integrally molded within the central cylindrical stem coupling mechanism and defining a threaded aperture disposed therein, said central cylindrical stem coupling mechanism protruding from the second medial side;
- and
- a plurality of central stems removably and selectively couplable to the central cylindrical stem coupling mechanism, wherein the stems vary in size, one of said plurality of stems having a flat exterior bearing surface configured to engage the central cylindrical stem coupling mechanism.
A method for implanting a medical device, the method comprising:
- shaping a scapula to receive a glenoid prosthetic;
- selecting a center fixation peg from a plurality of pegs;
- coupling the center fixation peg to a bore defined by a fixed metal bushing integrally molded within a generally cylindrical coupling mechanism of a glenoid prosthetic so as to position a coupling mechanism bearing surface on the center fixation peg against a center fixation peg bearing surface on the coupling mechanism, said glenoid prosthetic having a plurality of fixed fixation pegs;
- and
- coupling the glenoid prosthetic to the scapula after coupling the center fixation peg to the bore,
- wherein coupling a center fixation peg to the glenoid prosthetic further includes determining at least one of an appropriate central peg fixation surface and a central peg fixation size.
Dependencies are inferred from the claim text.