Apparatuses and methods for implanting glenoid prostheses
Various apparatus and methods for implanting glenoid prostheses are disclosed. In various embodiments, a method for performing shoulder surgery can include guiding a guide pin into the glenoid surface along a reaming axis. A partial reaming guide can be placed in contact with the glenoid surface over the guide pin. A reamer can be guided over the guide pin to ream the glenoid surface. The reamer can be further advanced over the guide pin until the reamer contacts the partial reaming guide, whereby such contact limits reaming to only a portion of the glenoid surface.
1. A method for performing a shoulder surgery involving preparation of a glenoid surface of a patient's shoulder, comprising:
guiding a guide pin into the glenoid surface along a reaming axis;
placing a partial reaming guide in contact with the glenoid surface over the guide pin, wherein the partial reaming guide comprises:
a guide body including a patient-matched surface shaped to conform to a portion of a scapula of a patient;
a reamer depth stop surface at a first height above the patient-matched surface, the reamer depth stop surface positioned to serve as a depth stop for a reaming device to control a depth of reaming; and
a first hole through the guide body extending from the reamer depth stop surface to the patient-matched surface, the first hole aligned with a reaming axis;
advancing a reamer over the guide pin to ream the glenoid surface;
further advancing the reamer over the guide pin until the reamer contacts the partial reaming guide, whereby such contact limits reaming to only a portion of the glenoid surface.
2. The method of claim 1 , further comprising forming a channel in the scapula medially from the glenoid surface, the channel configured to receive an anchor peg of a glenoid baseplate.
3. The method of claim 2 , further comprising advancing a drill over the guide pin to form an anchor peg channel centered on the reaming axis.
4. The method of claim 2 , further comprising advancing an anchor peg channel forming guide toward the glenoid surface, the anchor peg channel forming guide comprising a body and an aperture formed inward of a periphery of the body and securing the anchor peg channel forming guide against the glenoid surface with the aperture off-set from the reaming axis.
5. The method of claim 1 , wherein advancing the reamer and further advancing the reamer comprises reciprocating a reaming surface of the reamer about an angle of less than 180 degrees relative to the reamer axis.
6. The method of claim 1 , further comprising inserting an anchor peg of a glenoid baseplate into an anchor peg channel formed in the glenoid surface.
7. The method of claim 6 , further comprising coupling a screw trajectory guide with the baseplate and forming one or more screw holes in the scapula through the screw trajectory guide and the baseplate.
8. The method of claim 7 , further comprising controlling a depth of the one or more screw holes with a corresponding depth control surface of the screw trajectory guide.
9. The method of claim 1 , further comprising defining a reaming axis based on image data responsive to a scan of a scapula of a patient.
10. A method for performing shoulder surgery involving preparation of a glenoid surface of a patient's shoulder, comprising:
guiding a guide pin into the glenoid surface along a reaming axis;
placing a partial reaming guide in contact with the glenoid surface over the guide pin, wherein the partial reaming guide comprises:
a guide body including a patient-matched surface shaped to conform to a portion of a scapula of a patient;
a reamer depth stop surface at a first height above the patient-matched surface, the reamer depth stop surface positioned to serve as a depth stop for a reaming device to control a depth of reaming; and
a first hole through the guide body extending from the reamer depth stop surface to the patient-matched surface, the first hole aligned with a reaming axis;
selecting a tip connector based on patient-specific image data;
connecting a reaming device to a handle by way of the selected tip connector; and
advancing the reaming device over the guide pin until the reaming device contacts the partial reaming guide, whereby such contact limits reaming to only a portion of the glenoid surface.
11. The method of claim 10 , further comprising, after the advancing, placing a guide pin guide over the at least partially reamed glenoid surface to verify the at least partial reaming, the guide pin guide having a patient-matched bone-facing surface.
12. The method of claim 10 , further comprising installing a glenoid assembly in the glenoid surface after the advancing.
13. The method of claim 10 , wherein selecting the tip connector comprises selecting the tip connector from a plurality of differently-sized tip connectors.
14. The method of claim 10 , wherein selecting the tip connector comprises forming the tip connector based on the patient-specific image data.
15. The method of claim 10 , further comprising a plurality of tip connectors with distally-extending projections having different lengths.