An interspinous posterior device (IPD) is described. The IPD has a body and bone fixation elements on either side of the body, each of said bone fixation elements having a ratchet locking mechanism for fixing the body to successive spinous processes of a mammalian vertebra. Each of the bone fixation elements is independently adjustable by ratcheting it separately and independently of the other bone fixation elements. The body of the IPD has a dynamic configuration and a non-dynamic configuration, wherein the dynamic configuration allows for both extension and flexion of the successive spinous processes and the non-dynamic configuration prohibits extension of the successive spinous processes. The IPD also includes a removable extension restriction block, wherein the extension restriction block can optionally be inserted in the body to prohibit extension or can be removed from the body to allow extension.

An interspinous spacer includes a body having a channel and at least one slot; an arm actuator defining a threaded channel; an actuator screw including a shaft with a threaded distal portion partially disposed in the channel of the body and the threaded channel of the arm actuator; a first pin arranged to move along the slot of the body; a second pin; and first and second arms, each having a coupling extension that defines a pin opening and a curved track. The first and second arms are coupled to the body by the second pin extending through the curved tracks and further coupled to the body and the actuator arm by the first pin extending through the pin openings. The first and second arms rotate among different deployment positions according to the curved track in response to longitudinal movement of the actuator arm as the actuator screw is rotated.

Misaligned bones on opposite sides of a joint are aligned using a first rigid extension securable to one of the misaligned bones using a particular surgical approach, and a second rigid extension having a contacting surface positionable in contact with the other the two misaligned bones from the same surgical approach. The first and second rigid extensions are moved with respect to each other using a lever, whereby a pulling force is exerted on one of the bones, and a pushing force on the other, thereby aligning the first and second misaligned bones.

An expandable intervertebral cage includes vertically opposed superior and inferior plates and longitudinally opposed distal and proximal wedges disposed between the plates. The wedges define ramps that engage complimentary ramps of the superior and inferior plates to increase a vertical distance between the plates. An actuator is located between the plates, defines a central, longitudinal axis, and is coupled to the wedges such that, as the actuator rotates about the axis, at least one of the wedges moves longitudinally relative to the other, thereby increasing the vertical separation distance. At least one locking component is insertable within a receptacle at least partially defined by the proximal wedge and is configured to transition from an unlocked configuration, where the actuator is rotatable relative to the proximal wedge, to a locked configuration, where the actuator is rotationally affixed relative to the proximal wedge.

Various implementations include anchoring nails, fixation apparatuses, spinal fixation systems, and related methods described in this disclosure. Certain implementations include a fixation nail for an interbody fusion procedure, the fixation nail including: a body having an arcuate primary axis extending from a distal end to a proximal end thereof, the body having an outer surface that enables complete insertion and removal of the fixation nail into an interbody without threaded engagement, and the body further including an elongated recess spanning a majority of a length of the body, the elongated recess sized to at least partially encompass at least one of tissue or bone during insertion into a patient.

The present technology is generally directed to expandable intervertebral devices, and associated devices, systems, and methods. In some embodiments, an intervertebral device is configured to transition between multiple different states, for example, between an unexpanded state and an expanded state. The expansion of the intervertebral device can include horizontal/lateral expansion and/or vertical/lordotic expansion. In some embodiments, the intervertebral device includes locking features configured to hold or lock the intervertebral device in an expanded state, e.g., to inhibit or prevent the intervertebral device from transitioning away from and/or out of the expanded state.

A modular implant system includes a baseplate, a bearing insert and a latch. The baseplate is adapted to receive the bearing insert. The bearing insert has an articular surface and a plate-contacting surface opposite the articular surface and the latch is adapted for disposal through a hole in the bearing insert. The system is adapted so that when the plate-contacting surface of the bearing insert is disposed on the baseplate and the latch is disposed through the hole in the bearing insert, the latch is rotatable from a first position to a second position. In the first position, the bearing insert is removable from the baseplate. In the second position, the bearing insert is held in place on the baseplate.

A medical device for implantation in a knee joint of a human patient is provided. The medical device comprises: an inner surface and an outer surface. The inner surface comprises: a first point, a second point, a third point, a fourth point, a fifth point, and a sixth point, all points located on different places along a length axis of said inner surface. A first straight line, reaching from the first point to the second point is parallel to a second straight line reaching from the third point to the fourth point, which in turn is parallel to a third straight line reaching from the fifth point to the sixth point. The first and third straight lines are of equal length and the second straight line is longer than the first, furthermore the third straight line is positioned between the first and third straight lines. Wherein the medical device comprises a first articulating surface adapted replaced the surface of the contacting surface of the medial condyle, a second articulating surface adapted to replace the contacting surface of the lateral condyle and a third articulating surface adapted to replace the contacting surface of the patella.

Interbody fusion systems and methods are provided. According to one embodiment, an interbody fusion system may include an interbody fusion device implantable in an interbody space of a spinal joint. The interbody fusion device may include a first component and a second component. The first component and the second component, together, may define a mating interface at which the first component and the second component are securable together with the first component and the second component both positioned entirely within the interbody space. The first component and the second component, together, may have at least a first cavity that is exposed on a superior side and on an inferior side of the interbody fusion device. The system may further include a first inserter securable to a first proximal end of the first component and a second inserter securable to a second proximal end of the second component.

A prosthesis for primary artrodhesis can be used for artroplasty and a prosthesis for artroplasty comprises members for artrodhesis. The prosthesis (1b) for primary artrodhesis comprises a locking member (33b) with an attachment portion (16b) which is insertable into a hole (8b) in a first attachment member (4b) of the prosthesis for location of the locking member therein, and a lockable member (34b) integral with a second attachment member (5b) of the prosthesis. The lockable member (34b) is configured for adjustable setting thereof relative to the locking member (33b) and for fixation thereof, in set position, to the locking member. Alternatively, the lockable member comprises an attachment portion which is insertable into a hole in the second attachment member for location of the lockable member therein. At the prosthesis for artroplasty, the hole in the first screw-like attachment member is partly configured to define a press fit with an attachment pin of a socket member and partly threaded to permit, after removal of the socket member, during artrodhesis, securing by screwing in the hole of the locking member for cooperation with a lockable member which is configured for adjustable setting thereof relative to the locking member and for fixation thereof, in set position, to the locking member.