Abstract: Systems and methods are disclosed for maintaining spacing between a superior spinous process and a superior lamina, and an inferior spinous process and an inferior lamina of adjacent vertebrae of a spine. A system may include an implant having a proximal superior surface with a superior concavity shaped to receive the superior spinous process, a proximal inferior surface with an inferior concavity shaped to receive the inferior spinous process, a distal superior surface, distal to the proximal superior surface, that faces the superior lamina, and a distal inferior surface, distal to the proximal inferior surface, that faces the inferior lamina. The implant may further have a threaded member extending along a proximal-distal direction, that rotates to urge the implant to move from a retracted configuration to a deployed configuration by urging the distal superior surface and the distal inferior surface to move apart.

Abstract: A system for attaching first and second bone segments together may include a first component and a second component. The first component may have a first component bone engagement end implantable into a first bore formed in the first bone segment, and a first component attachment end. The second component may have a second component bone engagement end implantable into a second bore formed in the second bone segment, and a second component attachment end with a first projection that is movable, in response to a temperature change of the first projection, between insertion and locking configurations. In the insertion configuration, the first projection may be positioned to avoid interference with withdrawal of the second component attachment end from the first component attachment end. In the locking configuration, the first projection may be positioned to interfere with withdrawal of the second component attachment end from the first component attachment end.

Abstract: Medical implant surface treatments and methods are described. Such a surface treatment may provide an uneven texture that is configured to interlock with adjoining bone and/or an uneven texture on another implant, such as an augment for an acetabular cup for revision hip surgery. At least one of the uneven texture of the cup bone-facing surface and the uneven texture of the augment cup-facing surface may include a web of rods. The rods may be configured to interlock with each other when the two implants are urged together.

Abstract: An expandable intervertebral implant is disclosed for use in between adjacent vertebral bodies in a spine. An expandable intervertebral implant may include an upper plate having a first upper side and a second upper side, a lower plate having a first lower side, a second lower side, and a first lattice that connects the first upper side to the first lower side. The expandable intervertebral implant may further include a second lattice that connects the second upper side of the upper plate to the second lower side of the lower plate and an opening having a longitudinal axis between the upper plate, lower plate, first lattice, and second lattice. The expandable intervertebral implant may further include an expansion mechanism comprising a driver that expands the upper plate and the lower plate away from each other along a cephalad-caudal axis by deforming the first lattice and the second lattice.

Abstract: A method may be used to correct a condition present in a patient. The method may include obtaining a first bone model of a first bone of one or more bones of the patient's foot, and using at least the first bone model to generate a cutting guide model. The cutting guide model may define a first bone engagement surface shaped to match a first contour on the first bone, and a first guide feature that, with the first bone engagement surface overlying the first contour, is positioned to guide resection of the one or more bones as part of a surgical osteotomy for correcting the condition. The surgical procedure may be selected from a first group consisting of a bunion correction osteotomy, an Evans calcaneal osteotomy, and a medializing calcaneal osteotomy. The first bone may be selected from a second group consisting a metatarsus, a cuneiform, and a calcaneus.

Abstract: Systems and methods are disclosed for maintaining spacing between a superior spinous process and a superior lamina, and an inferior spinous process and an inferior lamina of adjacent vertebrae of a spine. A system may include an implant having a proximal superior surface with a superior concavity shaped to receive the superior spinous process, a proximal inferior surface with an inferior concavity shaped to receive the inferior spinous process, a distal superior surface, distal to the proximal superior surface, that faces the superior lamina, and a distal inferior surface, distal to the proximal inferior surface, that faces the inferior lamina. The implant may further have a threaded member extending along a proximal-distal direction, that rotates to urge the implant to move from a retracted configuration to a deployed configuration by urging the distal superior surface and the distal inferior surface to move apart.

Abstract: An acetabular joint prosthesis may be designed to replace an acetabular articular surface. The prosthesis can include an acetabular cup, an augment, and an augment-securing mechanism configured to secure the augment to the cup. The mechanism can be reconfigured between an unlocked configuration in which a slider is slidable along a guide feature and a locked configuration in which the slider or guide feature is in an expanded form such that the slider is fixed in place relative to the guide feature. An unlocked configuration may include the augment-securing mechanism allowing rotation between the augment and the cup, with the augment being securable to the augment in multiple rotational positions. Also, the prosthesis may be configured to facilitate actuation between the unlocked and locked configurations, including moving an instrument to the prosthesis in an access direction that is substantially perpendicular to a rim of the cup.

Abstract: An acetabular joint prosthesis may be designed to replace an acetabular articular surface. The prosthesis can include an acetabular cup, an augment, and an augment-securing mechanism configured to secure the augment to the cup. The mechanism can be reconfigured between an unlocked configuration in which a slider is slidable along a guide feature and a locked configuration in which the slider or guide feature is in an expanded form such that the slider is fixed in place relative to the guide feature. An unlocked configuration may include the augment-securing mechanism allowing rotation between the augment and the cup, with the augment being securable to the augment in multiple rotational positions. Also, the prosthesis may be configured to facilitate actuation between the unlocked and locked configurations, including moving an instrument to the prosthesis in an access direction that is substantially perpendicular to a rim of the cup.

Abstract: A system for attaching a middle phalanx and a proximal phalanx together may include a middle component and a proximal component. The middle component may have a middle component bone fastener implantable into a first bore formed in the middle phalanx, and a middle component attachment end with a first engagement feature with a first shape. The proximal component may have a proximal bone fastener implantable into a second bore formed in the proximal phalanx, and a proximal component attachment end with a second engagement feature with a second shape. The first engagement feature may be movable into engagement with the second engagement feature along an engagement direction that is generally perpendicular to the middle phalanx and/or the proximal phalanx. The second shape may be complementary to the first shape such that the first engagement feature interlocks with the second engagement feature.

Abstract: A system for attaching first and second bone segments together may include a first component and a second component. The first component may have a first component bone engagement end implantable into a first bore formed in the first bone segment, and a first component attachment end. The second component may have a second component bone engagement end implantable into a second bore formed in the second bone segment, and a second component attachment end with a first projection that is movable, in response to a temperature change of the first projection, between insertion and locking configurations. In the insertion configuration, the first projection may be positioned to avoid interference with withdrawal of the second component attachment end from the first component attachment end. In the locking configuration, the first projection may be positioned to interfere with withdrawal of the second component attachment end from the first component attachment end.

Abstract: An acetabular joint prosthesis may be designed to replace an acetabular articular surface. The prosthesis can include an acetabular cup, an augment, and an augment-securing mechanism configured to secure the augment to the cup. The mechanism can be reconfigured between an unlocked configuration in which a slider is slidable along a guide feature and a locked configuration in which the slider or guide feature is in an expanded form such that the slider is fixed in place relative to the guide feature. An unlocked configuration may include the augment-securing mechanism allowing rotation between the augment and the cup, with the augment being securable to the augment in multiple rotational positions. Also, the prosthesis may be configured to facilitate actuation between the unlocked and locked configurations, including moving an instrument to the prosthesis in an access direction that is substantially perpendicular to a rim of the cup.

Abstract: A polyaxial bone anchor assembly, comprising: a threaded screw portion comprising an externally threaded head end; a head body selectively disposed concentrically about the externally threaded head end of the threaded screw portion, wherein the head body defines an internally threaded hole in a bottom portion thereof; and an externally threaded compression saddle assembly selectively disposed within an interior portion of the head body and selectively engaging the externally threaded head end of the threaded screw portion; wherein the externally threaded compression saddle assembly and the externally threaded head end of the threaded screw portion are selectively disposed within the interior portion of the head body by engaging and passing through the internally threaded hole in the bottom portion of the head body.

Abstract: A polyaxial bone anchor assembly, comprising: a threaded screw portion comprising a head end; a head body disposed concentrically about the head end of the threaded screw portion; and a saddle assembly disposed within the head body and selectively engaging the head end of the threaded screw portion; wherein, when the saddle assembly is translated within the head body into a first locked position, the head body is coupled to the threaded screw portion such that disengagement of the head body from the threaded screw portion is allowed; and wherein, when the saddle assembly is translated within the head body into a second locked position, the head body is coupled to the threaded screw portion such that disengagement of the head body from the threaded screw portion is prevented.

Abstract: A bone anchor system utilizing an extended tab tulip having rails which extend from a point above the skin of a patient to a point proximal a bone anchor, and a slide member pivotally coupled to a rod, the slide member having engagement features which align to the rails of the extended tabs such that the coupled rod assembly is easily and efficiently guided to a position more proximate to the bone anchor and the rod is simultaneously pivoted into engagement with an adjacent bone anchor under the skin and musculature of the patient, for example.

Abstract: A bone anchor system utilizing an extended tab tulip having rails which extend from a point above the skin of a patient to a point proximal a bone anchor, and a slide member pivotally coupled to a rod, the slide member having engagement features which align to the rails of the extended tabs such that the coupled rod assembly is easily and efficiently guided to a position more proximate to the bone anchor and the rod is simultaneously pivoted into engagement with an adjacent bone anchor under the skin and musculature of the patient, for example.

Abstract: A polyaxial bone anchor assembly, comprising: a threaded screw portion comprising an externally threaded head end; a head body selectively disposed concentrically about the externally threaded head end of the threaded screw portion, wherein the head body defines an internally threaded hole in a bottom portion thereof; and an externally threaded compression saddle assembly selectively disposed within an interior portion of the head body and selectively engaging the externally threaded head end of the threaded screw portion; wherein the externally threaded compression saddle assembly and the externally threaded head end of the threaded screw portion are selectively disposed within the interior portion of the head body by engaging and passing through the internally threaded hole in the bottom portion of the head body.

Abstract: A polyaxial bone anchor assembly, comprising: a threaded screw portion comprising a head end; a head body disposed concentrically about the head end of the threaded screw portion; and a saddle assembly disposed within the head body and selectively engaging the head end of the threaded screw portion; wherein, when the saddle assembly is translated within the head body into a first locked position, the head body is coupled to the threaded screw portion such that disengagement of the head body from the threaded screw portion is allowed; and wherein, when the saddle assembly is translated within the head body into a second locked position, the head body is coupled to the threaded screw portion such that disengagement of the head body from the threaded screw portion is prevented.

Abstract: A surgical instrument for the dissection of bone and other tissue includes a spindle, a dissection tool and a coupler disposed between the spindle and the dissection tool. The coupler includes a tool collet and an attachment locking mechanism operable to permit tool collet operation and telescoping movement of an attachment tube with respect to the dissection tool. A method is also provided for convenient coupling of the dissection tool and adjustment of the attachment tube length.

Abstract: A surgical instrument for the dissection of bone and other tissue includes a spindle, a dissection tool and an coupler disposed between the spindle and the dissection tool. The coupler includes a tool collet and an attachment locking mechanism operable to permit tool collet operation and telescoping movement of an attachment tube with respect to the dissection tool. A method is also provided for convenient coupling of the dissection tool and adjustment of the attachment tube length.

Abstract: A surgical instrument for the dissection of bone and other tissue includes a spindle, a dissection tool and a coupler disposed between the spindle and the dissection tool. The coupler includes a tool collet and an attachment locking mechanism operable to permit tool collet operation and telescoping movement of an attachment tube with respect to the dissection tool. A method is also provided for convenient coupling of the dissection tool and adjustment of the attachment tube length.