The present invention relates to an expandable implant for engagement between vertebrae generally comprising an inner member, outer member, and gear member positioned coaxial with respect to each other such that the inner and outer members are moveable relative to each other along an axis. The gear member is axially fixed to the outer member and freely rotatable with respect to the outer member and the gear member threadedly engages a threaded portion of the inner member to translate inner member along the axis. The implant is configured to engage the vertebrae in a predetermined alignment and the gear member includes gear teeth exposed to the exterior and configured to be accessible by a tool member at a plurality of angular positions around the perimeter of the implant device.

Expandable fusion devices, systems, and methods. The expandable fusion device includes one or more integrated deployable retention spikes configured to resist expulsion of the device when installed in the intervertebral disc space. The implant may include upper and lower main endplates, an actuator assembly configured to cause an expansion in height of the upper and lower main endplates, and a sidecar assembly including a sidecar carrier, an upper carrier endplate pivotably coupled to an upper spike, and a lower carrier endplate pivotably coupled to a lower spike such that forward translation of the sidecar carrier pushes against the upper and lower carrier endplates, thereby deploying the upper and lower spikes.

A graft cage includes cross-sectional portions and longitudinal members. Each portion includes base transverse members forming a cage base; a first arm including first arm transverse members; a second arm including second arm transverse members; base connecting struts, each base connecting strut extending between first one and second one of the base members; first arm connecting struts, each first arm connecting strut extending between a first one of the first members and a second one of the first members; and second arm connecting struts, each second arm connecting strut extending between first one and second one of the second members. The longitudinal members connect the portions to one another. Intersections of the portions with the longitudinal members forming pores in the first and second arms. The pores receive an arm tip of a further graft cage therein to interlock the cage with the further cage.

A system for converting a first joint prosthesis to a second joint prosthesis in-situ includes a plurality of inserts having a bone interface side and a component facing side and a plurality of articulating components having a cavity configured to receive at least one of the plurality of inserts. The plurality of inserts may be unicompartmental, bicompartmental, or tricompartmental. The inserts may be made of metal and may have a bone contacting surface made of a porous metal. The plurality of articulating components may be unicompartmental, bicompartmental, or tricompartmental. The articulating components may be sized and shaped to cover one or more of the plurality of bone interface components and span a distance therebetween. The articulating components may be made of a polymer.

An implant includes a plate having a plurality of fastener holes, the plurality of fastener holes being configured to receive a plurality of fasteners, respectively; a spacer coupled to the plate and configured to be inserted into a treatment region; and a fastener lock movably coupled to the plate and configured to lock the plurality of fasteners.

According to some embodiments, a method of inserting a lateral implant within an intervertebral space defined between an upper vertebral member and a lower vertebral member includes creating a lateral passage through a subject in order to provide minimally invasive access to the intervertebral space, at least partially clearing out native tissue of the subject within and/or near the intervertebral space, positioning a base plate within the intervertebral space, wherein the base plate comprise an upper base plate and a lower base plate and advancing an implant between the upper base plate and the lower base plate so that the implant is urged into the intervertebral space and the upper vertebral member is distracted relative to the lower vertebral member.

An intervertebral implant frame that is configured to be attached to a spacer body can include a pair of arms that extend longitudinally from a support member such that the arms extend substantially around the spacer body. The arms may be configured to expand, crimp, or otherwise engage the spacer body to thereby hold the spacer body to the frame. The spacer body may be made from bone graft.

An intervertebral implant for spondylolisthesis correction includes a superior side with serrations angled superiorly and toward the implant insertion direction, an inferior side with serrations angled inferiorly and opposite the implant insertion direction, and an instrument connection feature. An instrument for connection to the implant includes an implant connection feature movable between unlocked and locked states, and a friction-reducing feature movable between disengaged and engaged states. The instrument has a first state, in which the implant connection feature is in the unlocked state and the friction-reducing feature is in the disengaged state; a second state, in which the implant connection feature is in the locked state and the friction-reducing feature is in the engaged state; and a third state, in which the implant connection feature is in the locked state and the friction-reducing feature is in the disengaged state. Methods of apparatus assembly and surgery are disclosed.

Expandable fusion devices, systems, and methods. The expandable fusion device includes one or more integrated deployable retention spikes configured to resist expulsion of the device when installed in the intervertebral disc space. The implant may include upper and lower main endplates, an actuator assembly configured to cause an expansion in height of the upper and lower main endplates, and a sidecar assembly including a sidecar carrier, an upper carrier endplate pivotably coupled to an upper spike, and a lower carrier endplate pivotably coupled to a lower spike such that forward translation of the sidecar carrier pushes against the upper and lower carrier endplates, thereby deploying the upper and lower spikes.

According to some embodiments, a method of inserting a lateral implant within an intervertebral space defined between an upper vertebral member and a lower vertebral member includes creating a lateral passage through a subject in order to provide minimally invasive access to the intervertebral space, at least partially clearing out native tissue of the subject within and/or near the intervertebral space, positioning a base plate within the intervertebral space, wherein the base plate comprise an upper base plate and a lower base plate and advancing an implant between the upper base plate and the lower base plate so that the implant is urged into the intervertebral space and the upper vertebral member is distracted relative to the lower vertebral member.