Orthopedic implants, systems, instruments, and methods. A bi-portal lumbar interbody fusion system may include an expandable interbody implant and minimally invasive pedicle-based intradiscal fixation implants. The interbody and intradiscal implants may be installed with intelligent instrumentation capable of repeatably providing precision placement of the implants. The bi-portal system may be robotically-enabled to guide the instruments and implants along desired access trajectories to the surgical area.

A bone screw, and method of using the same, are described. The bone screw includes a head, a distal threaded portion, and an expandable intermediate portion. The intermediate portion is expandable in response to a force being applied from an unstressed or relaxed state to a stressed or unrelaxed state. A removable core pin may be inserted into the intermediate portion to stretch or stress and/or stabilize the intermediate portion.

The disclosure provides a spinal implant having spinal anchors comprising a bone anchor and a receiver configured to securely and polyaxially receive the bone anchor. Further, provided herein are methods for using the spinal implant.

The present disclosure relates to fixation devices. Certain embodiments provide a fixation device for insertion into bone. The fixation device includes a body comprising threads along an outer surface of the body. The fixation device includes one or more blades movably coupled to the body. The one or more blades are configured to move between at least a first position and a second position. In the first position, the one or more blades are retracted into the body. In the second position, the one or more blades are deployed out of the body for insertion into the bone.

A bone fusion device includes: a shaft including a porous section and a threaded proximal section configured for facilitating a compression.

A fixation device includes a tapered cannula defining a bore therethrough, a shaft, and a post. The shaft includes a proximal portion disposed within the bore, and central and distal portions extending distally from the tapered cannula. The proximal portion includes a threaded inner surface defined therein. The shaft includes blades disposed within the central portion, the blades movable between a closed position in which the blades are disposed within the shaft and an open position in which the blades extend laterally through the shaft. The post includes a threaded outer surface threadingly engaged with the threaded inner surface of the shaft. The post is movable longitudinally within the shaft to transition the blades between the closed and open positions.

A system for evaluating the evolution of a subject's bone structure, including an implantable medical device and a calculation module for computing a parameter representative of the bone structure. The implantable medical device has a distraction body and reflector(s). The distraction body distracts osteotomically separated bone section bodies and includes first/second blocks for implantation and attachment to first/second bone sections, the second bone section separated from the first bone section by an osteotomy, and an actuator for adjusting space between the first/second blocks, enabling distraction between the first/second bone sections. Each reflector reflects an electromagnetic signal and is embedded in a surrounding tissue when the distraction body is attached to the bone. The parameter is computed from the reflected signal, of an excitation signal including a frequency in the characteristic frequency range of each reflector, the reflected signal being representative of a dielectric constant of the surrounding tissue.

A surgical screw configured to expand and prevent or minimize bone growth inside of the surgical screw is provided. Accordingly, the surgical screw is configured to increase the purchase of the surgical screw with respect to the bone, but also to be withdrawn from the bone without damaging the bone as a result of bone ingrowth. The surgical screw includes a center post with an inner bore and an outer sleeve concentric to the center post. An outer surface of the outer sleeve includes a thread to engage bone. The outer sleeve includes a cut pattern defining an expandable region configurable between a first state with a first radius measured from a longitudinal axis of the surgical screw to the outer surface and a second state having a second radius measured from the longitudinal axis to the outer surface.

A pedicle screw system and methods of using same, the system including a pedicle screw with a screw head and a rod support housing with a head capture opening surrounded by relief slots. The rod support housing has an interior gripping ridge and an exterior locking groove. Pressing the screw head into the head capture opening results in regions of the rod support housing between the relief slots flexing outwardly to allow the screw head to pass over the gripping ridge, and the regions to cease flexing outwardly after the screw head is seated within the rod support housing. Pressing a locking ring over the head capture opening causes regions of the rod support housing between the relief slots to flex inwardly and allow a locking tab of the locking ring to pass into the locking groove, after which the regions cease flexing inwardly.

A graft or prosthetic element suitable, e.g., for replacing a tendon or ligament is fastened in a bone tunnel or blind opening with the aid of a fastener. In a first step, the graft or prosthetic element is press-fitted in the tunnel or opening by forcing the fastener into the opening or by positioning the fastener in the opening and then expanding it, wherein the fastener is in contact with the graft or prosthetic element and with the bone wall of the tunnel or blind opening. In a second step, the fastener is anchored in the bone wall of the tunnel or blind opening with the aid of a liquefiable material which is liquefied in the vicinity of the bone wall where it is in contact with the fastener and by making the liquefied material penetrate into the bone wall.