A bone fusion device includes a main body and a movable frame. The main body has an accommodation hole. A top surface and a bottom surface of the main body are provided with a plurality of first teeth. The movable frame is located in the accommodation hole. The movable frame has a through hole longitudinally penetrating a first surface and a second surface thereof. A first end of the movable frame is fixed to the front end of the main body, and a second end is suspended relative to the rear end of the main body. The first surface and the second surface are provided with a plurality of second teeth. The movable frame is transversely formed with a groove to define an upper portion and a lower portion, enabling the upper portion and the lower portion to be elastically expanded with the first end as a fulcrum.

A joint replacement device is provided that includes an inner surface configured to accommodate at least one of a portion of an outer surface of a femoral head of a femur and a prosthetic secured to the femoral head, an outer surface configured to accommodate at least one of a portion of an outer surface of an acetabulum socket and a prosthetic secured to a pelvis, wherein the inner surface and outer surface each have a circular curvilinear shape and together include an inner perimeter and an outer perimeter, and wherein the inner perimeter is joined to the outer perimeter to form a posterior limb and an anterior limb, and further including, a posterior portion, an anterior portion, and a superior portion formed from the inner surface and the outer surface; wherein the superior portion further includes a posterior superior portion and an anterior superior portion.

An orthopedic device for implanting between adjacent vertebrae comprising: an arcuate balloon and a hardenable material within said balloon. In some embodiments, the balloon has a footprint that substantially corresponds to a perimeter of a vertebral endplate. An inflatable device is inserted through a cannula into an intervertebral space and oriented so that, upon expansion, a natural angle between vertebrae will be at least partially restored. At least one component selected from the group consisting of a load-bearing component and an osteobiologic component is directed into the inflatable device through a fluid communication means.

A dynamic intervertebral spacer includes a ring which is split on an anterior portion. A posterior portion of the ring acts as a torsion spring. After implantation, the ring is able to act as a spring between superior and inferior vertebral bodies, thus allowing dynamic bone growth in fusion procedures.

Devices and methods for bone fixation including a bone fixation system including a bone plate or intervertebral spacer including a plurality of apertures dimensioned to receive bone fasteners and at least one polymeric element capable of transitioning from a solid state to a flowable state. The polymeric element transitions to a flowable state as a result of exposure to ultrasonic vibration. The polymeric element is placed on the bone plate or intervertebral spacer adjacent a fastener in an aperture and acts to prevent rotational and/or translational movement of the fastener relative to the bone plate or intervertebral spacer.

A placeholder for vertebrae or vertebral discs includes a tubular body, which along its jacket surface has a plurality of breakthroughs or openings for over-growth with adjacent tissue. The placeholder includes at least a second tubular body provided with a plurality of breakthroughs and openings at least partially inside the first tubular body. The first and second tubular bodies can have different cross-sectional shapes, can be are arranged inside one another by press fit or force fit or can be connected to each other via connecting pins and arranged side by side to one another in the first body.

A tibial tray for a resurfaced proximal portion of a tibia for a knee replacement for a patient includes, for example, a body having a superior portion, and an inferior tibia-engaging portion having a peripheral inferiorly-extending portion contactable with an underlying cortical bone and/or spaced apart from the underlying inner surface of the cortical of the tibia of the patient. In some embodiments in the total knee replacement, a greater portion of a shearing force acting transversely on the tibial tray and the resected portion of the proximal portion of the tibia of the patient is resisted by the at least one inferiorly-extending wall and the periphery of the resected proximal portion of the tibia compared to a portion of the shearing force being resisted along the center inferior surface of the tibial tray and the resected cancellous bone surface. Methods, robotic systems, and cutting guides are also disclosed.

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.

Expandable fusion devices, systems, instruments, and methods thereof. The expandable fusion device is capable of being installed inside an intervertebral disc space to maintain normal disc spacing and restore spinal stability, thereby facilitating an intervertebral fusion. The fusion device may include a body, a first endplate, and a second endplate. A drive screw may be rotated to move the first and second endplates outwardly and into an expanded configuration. Instruments may be provided to ensure the implant is inserted safely and as intended.

The present application generally relates to orthopedic systems, and in particular, to systems including independent plates and spacers. A plating system can include a spacer and a plate that is independent from the spacer. A number of locking mechanisms can be provided to secure the plate to the spacer. In some cases, the spacer includes a pair of notches that extend on an outer surface of the spacer. The plate can include a pair of lateral extensions that can engage the notches to secure the plate to the spacer. In other cases, the spacer includes an opening including a pair of inlets. The plate can include an enclosed posterior extension that can be received in the pair of inlets to secure the plate to the spacer.