An expandable interbody spacer for the spine is provided. The spacer includes upper and lower endplates simultaneously movable with respect to a housing along an axis transverse to a longitudinal axis to increase or decrease the height of the spacer selectably along both an anterior side and a posterior side for uniform expansion/contraction of the endplates or only along the anterior side for angular expansion/contraction of the endplates. A spacer deployment instrument is provided that is selectable to effect uniform or angular expansion/contraction. When uniform expansion/contraction is selected a gear on an anterior rod is engaged with a gear on a posterior rod to simultaneously rotate both rods in opposite directions. Opposite threads on actuators of the spacer effect translation of the actuators in the same direction along the longitudinal axis.

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.

An artificial knee joint comprises a femoral condyle prosthesis and a tibial plateau prosthesis; wherein the tibial plateau prosthesis includes a medial tibial plateau prosthesis and a lateral tibial plateau prosthesis disposed at both sides of the tibial plateau intercondylar eminence, respectively. The artificial knee joint further comprises a locating pin for fixing the tibial plateau prosthesis. The bottom surface of the tibial plateau prosthesis is provided with a prosthetic notch, and the tibia below the tibial plateau prosthesis is provided with a tibial notch. The prosthetic notch corresponds to the tibial notch, together forming a limiting hole for accommodating the locating pin. The cooperation between the locating pin and the limiting hole can ensure relative position stability and balance between the medial tibial plateau prosthesis and the lateral tibial plateau prosthesis.

A spinal fixation system includes an expandable disc replacement body and an adjustment mechanism. The expandable disc replacement body includes a first wall, a second wall, a hinge connecting the first wall and the second wall, and a first bone-screw receiving section at a proximal end of the first wall. The adjustment mechanism is positioned between the first wall and the second wall, and an angle between the first wall and the second wall can be varied by movement of the adjustment mechanism.

The present disclosure describes an intervertebral implant having a laterovertically-expanding shell operable for a reversible expansion from a collapsed state into an expanded state, the laterovertically-expanding shell having a guide element, one or more connectors, and a pair of lateral extension elements that function to laterally expand the footprint of the implant within an intervertebal disc space.

Bone and joint stabilization devices or systems are described that include multiple-layer bodies. The approach offers dramatically improved fatigue life as compared to one-piece spring members that are otherwise similar or comparable. Coordinated improved-strength anchor embodiments, anchor loading tools and methods of use are also described.

Stand-alone interbody fusion devices for engagement between adjacent vertebrae. The stand-alone interbody fusion devices may include a spacer and one or more inserts or members coupled to the spacer. The inserts or members may be configured and designed to provide the apertures which are designed to retain bone fasteners, such as screws, and secure the implant to the adjacent vertebrae.

An orthopedic implant with an inferior portion having a tibia contact surface configured to extend over a tibia; a superior portion opposite to the inferior portion having a tendon contact surface configured to change a position of a patellar tendon by lifting or tilting the patellar tendon when the curved surface of the first portion is engaged with the tibia; a fixation mechanism adapted to attach the orthopedic implant to the tibia; and an adjustment mechanism adapted to change a distance between the tendon contact surface and the tibia contact surface. The invention also includes a method for repositioning a patellar tendon of a patient.

An implantable medical device for implantation in a hip joint of a human patient is provided. The medical device comprises: at least one artificial hip joint surface adapted to replace at least the surface of at least one of the caput femur and acetabulum. At least one artificial hip joint surface comprises: a positioning hole with at least one opening in said at least one artificial hip joint surface. The hole is adapted to be placed and dimensioned such that the medical device is adapted to be fitted using a positioning shaft and at least partly surround the shaft, for positioning the at least one artificial hip joint surface in a desired position in the hip joint. The hole is adapted to be fitted using the positioning shaft, when the shaft is stabilized and placed in at least one of the femoral bone and the pelvic bone for positioning said medical device inside the hip joint.

An artificial functional spinal unit including an expandable intervertebral implant that can be inserted via a posterior surgical approach and used with one or more facet replacement devices to provide an anatomically correct range of motion is described. Lordotic and non-lordotic expandable, articulating implants and cages are described, along with embodiments of facet replacement devices and instruments for insertion. Methods of insertion are also described.