Joint osteotomy system and method

A method for preparing a bone comprising:

• inserting a drill guide mount into a resected joint space of a bone, the drill guide mount having a body with a front side defining a recess and a bottom side including a dovetail joint having a cavity defined between rails;
• coupling a shim to the drill guide mount by inserting a dovetail extension, extending from an upper surface of the shim, into the cavity of the dovetail joint;
• positioning the shim that is configured to fill a space between the bottom side of the drill guide mount and a resected surface of the bone;
• and
• slidably inserting a drill guide cartridge into the recess of the drill guide mount.

A conversion instrument for coupling a guide to a bone during a surgical procedure, the conversion instrument comprising:

• an elongate body extending from a proximal end to a distal end, wherein the proximal end defines a fixation region and the distal end defines an instrument attachment region;
• a first oblong section and a second oblong section extending transversely from the elongate body, each oblong section defining a respective plurality of interconnected holes;
• a dovetail joint at the distal end of the elongate body, the dovetail joint defining a cavity between a first rail and a second rail, the cavity sized and oriented so as to receive a dovetail extension of a guide;
• a locking wedge sized and oriented so as to be received within the cavity of the dovetail joint;
• a through-hole extending from a first side to a second side of the distal end, the through-hole sized and oriented so as to receive a locking bolt therein;
• and
• a locking bolt configured to press the locking wedge against the dovetail extension of the guide so as to prevent movement of the guide.

A method of coupling a guide to a bone during a surgical procedure, comprising:

• inserting one or more pins into a bone;
• sliding a conversion instrument over the one or more pins, the conversion instrument having an elongate body with a proximal end defining a fixation region, a distal end defining a dovetail joint with a cavity defined between a first rail and a second rail, a locking wedge within the cavity, and a through-hole sized to receive a locking bolt;
• receiving a dovetail extension of the guide within the cavity of the dovetail joint;
• inserting the locking bolt into the through-hole;
• and
• rotating the locking bolt to axially move the locking bolt such that the locking wedge is pressed against the dovetail extension to frictionally lock the guide to the conversion instrument.

A telescoping spacer assembly for positioning bones of a joint in a corrected alignment, the telescoping spacer assembly comprising:

• a first spacer having a body with a first surface configured to abut a first bone, and a second surface, the body defining a channel extending from the second surface into the body, the body further defining a first plurality of height adjustment holes extending from a third surface of the body into the channel;
• a second spacer having a body with a first surface configured to abut a second bone and a second surface from which an adjustment body extends, the adjustment body including a perimeter wall defining a hollow interior, the adjustment body sized and oriented for insertion into the channel of the first spacer, the perimeter wall defining a second plurality of height adjustment holes extending from a surface of the perimeter wall to the hollow interior;
• wherein a spacing between the first spacer and the second spacer is adjustable by sliding the adjustment body within the channel and further wherein the first plurality of height adjustment holes and the second plurality of height adjustment holes are positioned such that at least one of the first plurality of height adjustment holes is alignable with at least one of the second plurality of height adjustment holes when the first spacer and the second spacer are positioned at one or more predetermined distances.

A method of adjusting spacing between bones of a joint, the method comprising:

• positioning a first spacer adjacent to a first bone, the first spacer having a body defining a channel extending from a surface into the body, the body further defining a first plurality of height adjustment holes extending into the channel;
• positioning a second spacer adjacent to a second bone, the second spacer having an adjustment body extending from a surface, the adjustment body including a perimeter wall defining a hollow interior and a second plurality of height adjustment holes;
• inserting the adjustment body of the second spacer into the channel of the first spacer to couple the first spacer to the second spacer in a telescoping arrangement;
• adjusting a spacing between the first spacer and the second spacer by sliding the adjustment body within the channel until at least one of the first plurality of height adjustment holes is aligned with at least one of the second plurality of height adjustment holes, wherein adjusting the spacing includes increasing a distance between the first spacer and the second spacer by sliding a portion of the adjustment body out of the channel;
• and
• inserting a fixation element through the aligned height adjustment holes to maintain the first spacer and the second spacer in a selected spacing.