Abstract: Disclosed herein is an implant assembly including an alignment guide for aligning the engagement between a glenosphere and baseplate via a central screw engaged to the baseplate. The glenosphere includes first and second recess portions. The first recess portion of the glenosphere is configured to engage a tapered side surface of the baseplate and the second recess portion of the glenosphere is configured to engage a portion of a head of the central screw projecting outwardly from a top surface of the baseplate when engaged thereto. The portion of the head of the central screw projecting outwardly from the baseplate is slip-fit into the second recess of the glenosphere. This engagement aids the alignment of the glenosphere and the baseplate and helps to ensure the accurate alignment of the tapered engagement of the side surface of the baseplate and the first recess of the glenosphere.

Abstract: Trials for a reverse shoulder system are described. The trials generally include an insert housed within a humeral cup. The insert has a proximal end and a distal end, the proximal end having a concave recess therein adapted to receive a glenosphere prosthesis. The distal end of the insert includes a shaft, the shaft is substantially housed within the confines of the humeral cup. A distal end of the humeral cup is inserted in a humeral stem.

Abstract: An impactor for connection to a concave surface of an implant has a shaft extending along a first axis from a first end to a second end. The shaft first end includes a pivot surface surrounding an internal shaft bore. The internal bore extends along the first axis and is open at the first end and extends towards the second end about the first axis. The internal bore has a pin extending through the shaft and intersecting the bore. A resilient element is mounted in the shaft bore spaced towards the shaft second end. A post is mounted in the shaft bore along the first axis. The post has a first end engaging a threaded bore in the concave surface of the implant. The post has a second end engaging the resilient element and a slot therein slidably engaging the pin and a collar pivotally mounted on the shaft.

Abstract: A bone screw apparatus is provided for threaded engagement with a bone and, optionally, a medical device such as a bone plate. The bone screw has a shaft having a first end, a second end, and a first thread having a first pitch. The screw further includes a head having a proximal end, a distal end adjacent the shaft first end, and a second thread having a second pitch. The second thread has a variable pitch that increases in a proximal direction, but never exceeds the magnitude of any portion of the first pitch. Upon threaded engagement of the head with bone or a medical device, a compression force is generated which continuously decreases as the screw is further inserted.

Abstract: An impactor for connection to a concave surface of an implant has a shaft extending along a first axis from a first end to a second end. The shaft first end includes a pivot surface surrounding an internal shaft bore. The internal bore extends along the first axis and is open at the first end and extends towards the second end about the first axis. The internal bore has a pin extending through the shaft and intersecting the bore. A resilient element is mounted in the shaft bore spaced towards the shaft second end. A post is mounted in the shaft bore along the first axis. The post has a first end engaging a threaded bore in the concave surface of the implant. The post has a second end engaging the resilient element and a slot therein slidably engaging the pin and a collar pivotally mounted on the shaft.

Abstract: Trials for a reverse shoulder system are described. The trials generally include an insert housed within a humeral cup. The insert has a proximal end and a distal end, the proximal end having a concave recess therein adapted to receive a glenosphere prosthesis. The distal end of the insert includes a shaft, the shaft is substantially housed within the confines of the humeral cup. A distal end of the humeral cup is inserted in a humeral stem.

Abstract: Disclosed herein is an implant assembly including an alignment guide for aligning the engagement between a glenosphere and baseplate via a central screw engaged to the baseplate. The glenosphere includes first and second recess portions. The first recess portion of the glenosphere is configured to engage a tapered side surface of the baseplate and the second recess portion of the glenosphere is configured to engage a portion of a head of the central screw projecting outwardly from a top surface of the baseplate when engaged thereto. The portion of the head of the central screw projecting outwardly from the baseplate is slip-fit into the second recess of the glenosphere. This engagement aids the alignment of the glenosphere and the baseplate and helps to ensure the accurate alignment of the tapered engagement of the side surface of the baseplate and the first recess of the glenosphere.

Abstract: An instrument for holding a surgical tool or bone implant includes a handle with a bearing surface formed in one end for engaging the surgical tool. An elastically deformable plate is mounted on the handle body the plate having a catch element formed on a leading end thereof adapted to engage a coupling element formed on the surgical tool. The elastically deformable plate includes a cam follower formed in a recess thereon and includes a deformable spring section intermediate the can elements and the plate end with the catch element. An elongated pivotable loading member is rotatably mounted on the handle body. The loading member includes a cam surface for engaging the cam follower surface on the deformable plate. The cam surface on the loading member is shaped to elastically deform the elastically deformable plate section in a direction away from the plate catch element to thereby load and maintain a connecting force between the plate and the surgical tool or bone implant.

Abstract: An instrument for holding a surgical tool or bone implant includes a handle with a bearing surface formed in one end for engaging the surgical tool. An elastically deformable plate is mounted on the handle body the plate having a catch element formed on a leading end thereof adapted to engage a coupling element formed on the surgical tool. The elastically deformable plate includes a cam follower formed in a recess thereon and includes a deformable spring section intermediate the can elements and the plate end with the catch element. An elongated pivotable loading member is rotatably mounted on the handle body. The loading member includes a cam surface for engaging the cam follower surface on the deformable plate. The cam surface on the loading member is shaped to elastically deform the elastically deformable plate section in a direction away from the plate catch element to thereby load and maintain a connecting force between the plate and the surgical tool or bone implant.