Systems and methods are described for correcting sagittal imbalance in a spine including instruments for performing the controlled release of the anterior longitudinal ligament through a lateral access corridor and hyper-lordotic lateral implants.

A method for performing lumbar interbody fusion surgery may include forming an access corridor through a facet joint of a patient, removing disc material from a disc space of the patient via one or more instruments advanced through the access corridor, and advancing an interbody device through the access corridor and into the disc space.

A cage for implanting in bone includes a main body having a first surface that contacts a first bone surface, a second surface that contacts a second bone surface, a peripheral wall extending between the first and second surfaces, and a front wall portion configured to engage and fix a plating device on the main body.

A spinal bone graft includes one or more cortical bone portions forming a first unit. The first unit includes an engagement surface for contacting bone, and a mating surface. The mating surface forms at least one first undercut. The bone graft also includes one or more cortical bone portions forming a second unit. The second unit includes an engagement surface for contacting bone, and a mating surface. The mating surface forms either at least one second undercut, or at least one connector. In the former, at least one connector is received in each of the first and second undercuts to interconnect the first and second units. In the latter, the at least one connector of the second unit is received in the first undercut of the first unit to interconnect the first unit and second unit.

A spine implant for a TLIF surgical procedure is configured to be guided into place during implantation in conjunction with a complementary insertion instrument. The cage of the implant is constrained to a limited range of rotation about a pivoting post carried by the cage. The insertion instrument is configured to hold the post while controllably rotating the cage relative to the post in order to angularly position the implant during implantation. Range of rotational motion is controlled by the configuration of an opening in and end of the cage and a groove in the pivot post. A retaining pin of the implant extends from the cage into the groove of the post to rotationally connect the cage to the post.

An implant includes a first support, a second support rotatably coupled to the first support along a distal end of the implant, and a control assembly configured to move the implant between at least a first, collapsed orientation and a second, expanded orientation, the control assembly includes a control driver coupled to the first support and comprising a head and a shaft, the control driver configured to control relative movement between the first support and the second support, a control member configured to move along the shaft of the control driver, and a first linkage hingedly coupled to the control member and the second support, wherein movement of the control member causes the first support to move relative to the second support.

Provided is a structurally stable interbody cage. An interbody cage 1 includes a main body 2 distally including two branches 20,21 that are spaced apart from each other upward and downward, a rod 3 provided in the main body 2 so as to extend between the two branches 20,21, and a slider 4 configured to separate the two branches 20,21 upward and downward, the slider 4 being supported by the rod 3 so as to be movable in an axis direction of the rod, wherein the two branches 20,21 each distally have an inclined surface 26A, the inclined surfaces 26A facing each other, the distance between the inclined surfaces 26A gradually increasing toward distal ends thereof; the slider 4 slides on the inclined surfaces 26A of the two branches 20,21 when the slider 4 moves in the axis direction of the rod 3, and the two branches 20,21 each proximally have a constricted part 27 with a narrow thickness and an opening 5 is present between the upper constricted part 27 and the lower constricted part 27, the opening 5 being formed by a plurality of holes 50 to 52 continuous in the axis direction of the rod 3 and having an upper edge and lower edge that form protruding curves in a lateral view.

A vertebral implant device is described comprising a wedge, a plate having an external surface configuration and one or more plate tine, a staple having one or more staple tine and a coupling device. The coupling devices is configured to couple the wedge, the plate and the staple whereby when the vertebral implant is secured in a vertebral body, the external surface configuration of the plate alters the relative orientation of a superior endplate surface plane and an inferior endplate surface plane of the vertebral body and alters the alignment of the spine. In some embodiments, plate tines and staple tine are configured to frictionally engage the vertebral body. In some embodiments, the coupling device is a screw and a nut. In some embodiments, interchangeable wedges are used to provide multiple implant device configurations.

An expandable fusion device capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. The intervertebral implant may be configured to transition from a collapsed configuration having a first width and a first height to an expanded configuration having a second width and a second height.

An expandable fusion device may include a first endplate and a second endplate. The expandable fusion device may also include first and second ramps configured to mate with both the first and second endplates. The first ramp may include a mating feature having a first angle relative to a vertical axis, and the second ramp may include a mating feature having a second angle relative to the vertical axis such that the first angle is different from the second angle. In particular, the first and second ramps may be configured to provide for symmetrical expansion of the first and second endplates.