An intervertebral fusion device is disclosed. The intervertebral fusion device comprises a superior component (40), an inferior component (60) and a core component (10). The superior component (40) has a superior component top side and a superior component bottom side and is configured to be received in an intervertebral space between first and second vertebrae whereby the superior component top side abuts against the first vertebra. The inferior component (60) has an inferior component top side and an inferior component bottom side and is configured to be received in the intervertebral space whereby the inferior component bottom side abuts against the second vertebra. The superior component bottom side and the inferior component top side oppose each other when the superior and inferior components (40, 60) are received in the intervertebral space. The core component (10) is configured for insertion between the superior and inferior components (40, 60) whereby a separation between the superior and inferior components is determined. The core component (10) comprises a retention mechanism which moves between a contracted condition and an expanded condition. The core component (10) is insertable between the superior and inferior components (40, 60) when the retention mechanism is in the contracted condition. The retention mechanism inter-engages with the superior component (40) and the inferior component (60) when in the expanded condition and when the core component (10) is received between the superior and inferior components to thereby present resistance to movement of the core component from between the superior and inferior components.

Intervertebral fusion device comprising a superior component, an inferior component, and a core component. The superior component comprises first and second superior parts which are coupled to each other to allow the first and second superior parts to move apart to thereby increase a perimeter of the superior component top side. The inferior component comprises first and second inferior parts which are coupled to each other to allow the first and second inferior parts to move apart to thereby increase a perimeter of the inferior component bottom side. The core component is configured for insertion between the superior and inferior components whereby separation between the superior and inferior components is determined. The core component interengages with each of the superior and inferior components upon insertion. The superior and inferior components are unattached to each other before the core component is inserted between the superior and inferior components. As the core component is progressively inserted between the superior and inferior components, the core component: bears against the first and second superior parts to push the first and second superior parts progressively apart; and bears against the first and second inferior parts to push the first and second inferior parts progressively apart.

An end cap and a bone screw for use therewith are provided. One or more of the end caps can be used with a spinal implant used to replace portions of a vertebral body after a corpectomy thereof. The end cap can include a first end and a second end opposite from one another, a first side and a second side opposite from one another, and a body portion extending between the first end, the second end, the first side, and the second side. The body portion can include an exterior surface for contacting an endplate of a vertebral body, and an interior cavity formed in the end cap opposite from the exterior surface. The interior cavity can be sized to receive a flange portion of the spinal implant, and can include at least one attachment structure provided in the interior cavity facilitating attachment of the end cap to the flange portion of the spinal implant. One or more of the bone screws can be received through apertures formed in the end cap and into the endplate of the vertebral body. The bone screws can be configured, upon receipt in the apertures in the end caps, to lock in place relative thereto.

A spinal jack adapted for installation between first and second vertebral processes, including a central body supporting first and second inter-expandable jack halves between retracted and expanded positions. Each of the jack halves further includes gripping portions adapted for engaging the vertebral processes. A geared mechanism provides for expanding or retracting the jack halves in order to establish a corrected adjusted orientation between the processes.

An implant assembly including an expandable vertebral body replacement implant. Two outer cores disposed on opposing ends of an inner are configured to move away from each other when the inner core is actuated. The implant assembly may include removable endplate configured to engage vertebral bodies as interbody spacer or through a corpectomy. The implant may include a locking mechanism to prevent collapse or movement the implant assembly after implantation. The locking mechanism may be automatically engage after removal of an inserter instrument from the implant assembly.

An apparatus or a system employs a fixation assembly to stabilize and prevent migration of an interbody fusion device placed between adjacent vertebral bodies, and/or provide supplemental fixation of adjacent vertebral bodies. The fixation assembly may include modular fixation plates insertable and attachable to the interbody fusion device in situ. In certain embodiments, the fixation assembly may include a single fixation plate insertable and/or attachable to the interbody fusion device in situ. In certain embodiments, fixation plates are integrally formed with the interbody fusion device.

Devices and methods of correcting vertebral misalignment, including, e.g., spondylolisthesis, are disclosed. In one embodiment, a vertebral implant may include an assembly configured to be secured to a first vertebral body, wherein the assembly includes a frame made of a first material and at least one end plate made of a second material different than the first material; a reducing plate configured to be slidably received over the central portion, wherein the reducing plate is configured to be secured to a second vertebral body; and an actuator configured to move the reducing plate relative to the frame.

Various systems and methods are disclosed for joining multiple components of a prosthesis. For example, a system includes a first component having a body extending from a first end to a second end. Each of the first and second ends including a coupling element. At least one end including a male coupling element including a detent disposed within a hole defined by a protrusion, the detent being biased by a biasing member. A method includes coupling a first component to a second component. Coupling the first component to the second component includes aligning a female engagement element provided by the first component with a male coupling component provided by the second component and inserting the male coupling element into the female coupling element.

An orthopaedic surgical instrument system includes a hinged tibial insert trial and a tibial base trial. A post adapter is sized to be positioned over a post of the tibial base trial and to be positioned in a central opening defined in the hinged tibial insert trial. The hinged tibial insert trial includes a housing configured to be received in a femoral component and a button mechanism to selectively secure the hinged tibial insert trial to the femoral component. The system may include a shim trial sized to be attached to an inferior surface of the hinged tibial insert trial.

A surgical instrument includes a chassis, a first driving shaft, a first measuring mechanism, a second measuring mechanism, and a first handle. The chassis defines a first channel and a second channel each extending from a proximal end to a distal end. The first measuring mechanism corresponds to rotation in the first channel. The second measuring mechanism corresponds to rotation in the second channel. The first driving shaft is operable to be inserted into the first channel, engaging with the first measuring mechanism. The first driving shaft has an end portion configured to engage and drive a first adjustable feature and/or a second adjustable feature on a work-piece. The handle is operable to be releasably attached to the first driving shaft for applying torque or operable to remove the first driving shaft from the first channel.