An implant and method for posterior sacroiliac fusion having a plate for placement across the posterior surface of the sacroiliac joint, a transverse pin to slide through the plate and transverse the joint as well as provide an aperture to receive bone graft, and a sacral screw to be inserted through the plate.

A hybrid radiolucent screw having radiopaque components and radiolucent components, which collaboratively define a tip of the screw and a head of the screw. In this manner, distortion is minimized during fluoroscopy or radiography of the screw while visualization of the screw and surrounding area is enhanced.

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.

A compression device made of a superelastic material having a peripheral portion with an upper surface, a lower surface, and a central opening extending therethrough is provided. Tips of one or more resilient structures of the compression device project inward of the peripheral portion and form an opening. The one or more resilient structures are configured to exert a biasing force in a direction when deformed in an opposite direction. Also provided is a bone plate assembly comprising a captively retained compression device and a bone plate comprising one or more integrally formed resilient structures.

A transpedicular anchoring screw including a screw body having a first helical thread having:includes a proximal portion, having notched portions inscribed within notched angular sectors and separated by separation portions inscribed within separation angular sectors, where, over a screw pitch, a ratio between the sum of the measurements of the separation angular sectors and the sum of the measurements of the notched angular sectors is between 50% and 150%. The anchoring screw also includes a distal portion, having notched portions inscribed within notched angular sectors and separated by separation distal portions inscribed within separation angular sectors, where, over a screw pitch, a ratio between the sum of the measurements of the separation angular sectors and the sum of the measurements of the notched angular sectors is between 0% and 10%.

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.

An anchoring fixture for anchoring a prothesis to a skull bone may comprise a screw thread apparatus including a screw thread having a varying outer diameter and formed along a longitudinal length of the anchoring fixture; a flange configured to function as a stop for the anchoring fixture adapted to rest on top of the bone when the anchoring fixture is implanted into the bone; at least a main relief chamber formed into a portion of the screw thread having a first side along the longitudinal length that is curved shaped, and wherein the anchoring fixture is tapered over at least a first portion of the longitudinal length of the anchoring fixture and where the first portion is arranged at a distal end of the anchoring fixture, and where the distal end is opposite to the flange.

A nail for compressing two bone parts to treat bone fractures or osteotomies is provided. The nail has an elongate smooth portion and an elongate threaded portion that is constructed for generating axial compression along a length of the elongate threaded portion between two bone parts. The nail may also have one or more apertures for installing one or more crossing screws through the nail. An installation instrument particularly constructed to install the provided nail is provided. A first and second portion of the provided nail installation instrument may rotate relative to one another when a locking mechanism is disengaged, but are locked in position relative to one another when the locking mechanism is engaged, which enables installation of the provided nail.

A compression device made of a superelastic material having a peripheral portion with an upper surface, a lower surface, and a central opening extending therethrough is provided. One or more resilient teeth project inward of the peripheral portion into the central opening and are configured to exert a biasing force in an axial direction when deformed in a direction opposite the axial direction.

A device, including a body including a torque transfer section and a torque receiver section, wherein the device is a bone conduction hearing prosthesis bone fixture implant insertion device configured to interface with an interior of the bone fixture, and the device is made of a same class of materials at the torque transfer section and the torque receiver section and section(s) that interface with the bone fixture.