Reamer and guide for glenoid augment preparation

A reaming system comprising:

• a plurality of base guides, each of the plurality of base guides defining a base guide through bore, a base guide locking member, and a base guide articulating surface, the base guide articulating surface oriented at an angle relative to the base guide through bore, wherein the angle the base guide articulating surface is oriented relative to the base guide through bore is different for each of the plurality of base guides;
• a reamer defining a reamer through bore and including a first surface defining a reamer gear, a second surface defining a plurality of reamer teeth, and a reamer articulating surface operable to allow rotation of the reamer on the base guide articulating surface;
• a reamer driver defining a reamer driver through bore and a reamer driver gear, the reamer driver gear sized to mesh with the reamer gear;
• and
• a guide shaft defining a reamer driver receiver and a guide shaft locking member operable to engage the base guide locking member thereby securing the guide shaft to the base guide,
• wherein upon assembly of a reaming apparatus the base guide through bore of one of the plurality of base guides, the reamer through bore, and the reamer driver through bore are coaxial.

A reaming apparatus comprising:

• a base guide including a base guide through bore having a bore axis, a base guide articulating surface, and a base peg having a peg axis, the base guide articulating surface oriented perpendicular to the bore axis, the peg axis oriented at an angle relative to the bore axis;
• a reamer defining a reamer socket and a reamer articulation surface, the reamer including a reamer peg sized to be received in the base guide through bore and extending from the reamer articulation surface, and a plurality of cutting arms arranged perpendicular to the reamer peg;
• and
• a reamer driver defining a reamer drive ball configured to be received in the reamer socket and upon rotation of the reamer driver, cause the reamer to rotate.