Abstract: A cage device includes first and second segments pivotally connected by a hinge. Pivoted movement of the segments with respect to each other is limited by a first stopper portion of the first segment abutting against a second stopper portion of the second segment.

Abstract: An interbody spacer for spinal fusion surgery includes first and second opposite side walls that have open-cell metal foam at upper and lower faces, and a three-dimensional lattice disposed between open-cell metal foam at the upper and lower faces. The open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. The interbody spacer may be formed by additive manufacturing.

Abstract: An interbody spacer for spinal fusion surgery includes first and second opposite side walls that have open-cell metal foam at upper and lower faces, and a three-dimensional lattice disposed between open-cell metal foam at the upper and lower faces. The open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. The interbody spacer may be formed by additive manufacturing.

Abstract: A bone screw assembly includes a fastener including a shaft and a head disposed on the shaft. The fastener is configured to be anchored within a subject's bone. A receiving assembly is configured to be movably mounted on the head of the fastener. The receiving assembly includes a receiver disposable around at least a portion of the head of the fastener and defining a channel for receiving a rod member therein. A retaining ring is disposed within the receiver for holding the head of the fastener in the receiver. An insert is disposed in the receiver above the retaining ring. A saddle is disposed in the receiver above the insert. The saddle defines a cradle for seating the rod member in the receiver.

Abstract: A bone structural device including a plurality of bone structural segments, wherein adjacent bone structural segments are pivotally connected to one another about a pivot axis, and the bone structural segments are expandable in height, which is in a direction generally parallel to the pivot axis.

Abstract: An implant trial includes a trial body and an indicium disposed in the trial body. The trial body is positionable in a subject. The indicium is designed and constructed to indicate a parameter of the implant trial. The indicium is radiographically visible when the trial body is positioned in the subject. The implant trial may be a trial spacer for vertebrae.

Abstract: A guidewire system for spine surgeries includes a first guidewire portion having an elongate first guidewire body with a distal end and a proximal end. A threaded male fastener at the distal end of the first guidewire body is configured to fasten to a vertebra of a spine of a subject and a threaded female coupler at the proximal end of the first guidewire body defines a threaded opening. The guidewire system includes a second guidewire portion having an elongate second guidewire body with a distal end and a proximal end. A threaded male coupler at the distal end of the second guidewire body is configured to thread into the threaded female coupler of the first guidewire portion to fasten the second guidewire portion to the first guidewire portion to form an elongate guidewire.

Abstract: An interbody spacer for spinal fusion surgery includes first and second opposite side walls that have open-cell metal foam at upper and lower faces, and a three-dimensional lattice disposed between open-cell metal foam at the upper and lower faces. The open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. The interbody spacer may be formed by additive manufacturing.

Abstract: An interbody spacer for spinal fusion surgery includes first and second opposite side walls that have open-cell metal foam at upper and lower faces, and a three-dimensional lattice disposed between open-cell metal foam at the upper and lower faces. The open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. The interbody spacer may be formed by additive manufacturing.

Abstract: A bone structural device including a plurality of bone structural segments (40), wherein adjacent bone structural segments (40) are pivotally connected to one another about a pivot axis, and the bone structural segments (40) are expandable in height, which is in a direction generally parallel to the pivot axis.

Abstract: An interbody spacer for spinal fusion surgery includes first and second opposite side walls that have open-cell metal foam at upper and lower faces, and a three-dimensional lattice disposed between open-cell metal foam at the upper and lower faces. The open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. The interbody spacer may be formed by additive manufacturing.

Abstract: A receiving member has a primary socket for a fixation mechanism and a secondary socket for a locking device. The secondary socket has a first bore intersecting a portion of the primary socket and forming an arcuate cut-out. The secondary socket has a chord member extending into the secondary socket first bore that forms a radial undercut in the secondary socket. The secondary socket has a detent extending from the radial undercut into the chord member. The locking device is rotatable in the secondary socket between an unlocked position in which an engagement surface of a cap of the locking device is angularly displaced from the arcuate cut-out, and a locked position in which the cap engagement surface occupies the arcuate cut-out and engages the fixation mechanism, and the arm engages an underside of the chord member, thereby preventing the fixation member from disengaging the receiving member primary socket.

Abstract: A receiving member has a primary socket for a fixation mechanism and a secondary socket for a locking device. The secondary socket has a first bore intersecting a portion of the primary socket and forming an arcuate cut-out. The secondary socket has a chord member extending into the secondary socket first bore that forms a radial undercut in the secondary socket. The secondary socket has a detent extending from the radial undercut into the chord member. The locking device is rotatable in the secondary socket between an unlocked position in which an engagement surface of a cap of the locking device is angularly displaced from the arcuate cut-out, and a locked position in which the cap engagement surface occupies the arcuate cut-out and engages the fixation mechanism, and the arm engages an underside of the chord member, thereby preventing the fixation member from disengaging the receiving member primary socket.