A compression fastener may include a shaft and a helical thread disposed about the shaft. The shaft may include a proximal end, a distal end, a proximal shaft portion, and a distal shaft portion. The helical thread may include at least one concave undercut surface and a plurality of pitches that may include at least one first pitch along the proximal shaft portion and at least one second pitch along the distal shaft portion. The at least one concave undercut surface may be angled towards one of the proximal end and the distal end of the shaft, and the at least one first pitch and the at least one second pitch may not be equal to each other.

Bone anchors and surgical instruments (e.g., bone taps, drivers, etc.) are disclosed herein that include integrated guide tips. Use of these anchors or instruments can eliminate one or more of the steps in a conventional bone anchor installation procedure, improving surgical efficiency and safety. For example, a surgical instrument can include a guide projection configured for insertion through a cannulation formed in a bone anchor when the surgical instrument is coupled to the bone anchor. The surgical instrument can also include various mechanisms for adjusting the position of the guide projection relative to the bone anchor. The guide projection can replace the needle, stylet, and guidewire used in typical insertion procedures. The bone anchor can also include integrated tapping features to eliminate the need for a separate bone tap instrument. Thus, in some embodiments, targeting, tapping, and driving the bone anchor can be performed in a single step.

Various bone screws configured to be implanted into bone and methods of use are provided. In an exemplary embodiment, a bone screw is provided with an elongate shank and a head with a drive feature configured to couple with a driver tool for being advanced into bone and a threaded shank. The screw can have a distal end or tip that has one or more cutting edges thereon configured to cut bone as the bone screw is inserted into bone.

A femur fixation device includes an intramedullary nail having along its longitudinal axis a proximal portion, a distal portion and a lateral through hole extending through the proximal portion; and a hip screw capable of passing through the lateral through hole. An axis of the lateral through hole intersects the longitudinal axis at a first inclination angle. The proximal portion includes a first through hole. The first through hole is provided with a detachable positioning bracket therein. A positioning protrusion is defined at a lower end of one side of the positioning bracket. A line connecting the positioning protrusion and corresponding end points on a sidewall of the positioning bracket intersects the longitudinal axis at a second inclination angle. An outer surface of the hip screw is provided with a positioning groove. A tail nail is disposed in the first through hole.

A modular screw includes a first assembly and a second assembly. The first assembly includes a base portion having a head portion, a securing portion defining a first bore, and a receiving portion defining a second bore. The second assembly includes a first post, a second post including an engaging portion, and an elongate screw threadably engageable with the second post. The second post is dimensioned to be received through the second bore of the receiving portion of the first assembly such that when a first set screw is received in the first bore, the first set screw secures the base portion of the first assembly to the second post. The elongate screw received in the second post causes radial expansion of the engaging portion of the second post, which, in turn, causes the engaging portion to be affixed to the cavity of the first post.

A bone anchor includes a shank having a longitudinal axis, a core, a tip at one end of the core, and a thread forming a helix that extends around the core with a lower flank directed towards the tip and an upper flank directed away from the tip. A recess in a first turn of the thread forms a cutting structure, the recess being defined by first and second surfaces directly connected to one another at an angle. The first and second surfaces are spaced apart from every other turn of the thread above or below the first turn. A majority of the first surface is positioned higher axially than and circumferentially aligned with part of the second surface. At least one of the first or second surfaces extends circumferentially around the shank by a greater distance than an axial height of the at least one surface.

A bone implant may include a shaft having a proximal end, a distal end, a longitudinal axis, a proximal shaft portion, and a distal shaft portion. The proximal shaft portion may include a first minor diameter, and a first helical thread disposed about the proximal shaft portion defining a first major diameter. The first helical thread may include a first concave undercut surface. The distal shaft portion may include a second minor diameter, and a second helical thread disposed about the distal shaft portion defining a second major diameter. The second helical thread may include a second concave undercut surface. The first and second concave undercut surfaces may be angled towards the distal end of the shaft. The second minor diameter may be smaller than the first minor diameter and the second major diameter may be smaller than the first major diameter.

A self-drilling bone fusion screw apparatus is disclosed which includes at least first and second sliding boxes. A first screw member having a tapered end and a threaded body is disposed within the first sliding box, and a second screw member having a tapered end and a threaded body disposed within the second sliding box. An adjuster adjusts the height of the sliding boxes. The screw members are screwed into vertebral bodies in order to fuse the vertebral bodies together. A plurality of the self-drilling bone fusion screw apparatuses may be attached together and/or integrated via a plate or cage. Also disclosed is a cervical facet staple that includes a curved staple base and at least two prongs attached to the bottom surface of the curved staple base.

Presented herein is a bone fixture for a medical prosthesis. The bone fixture includes a self-drilling threaded body that is configured to be inserted into a recipient's bone. The threaded body includes a bone removal mechanism configured to cut away parts of the bone that are in the path of the threaded body and to remove portions of the cut parts of the bone, sometimes referred to herein as bone fragments, from the hole. The bone fixture also comprises a coupling section that is attached to a proximal end of the threaded body. The coupling section is configured to be positioned external to the recipient's bone and includes a connector interface that is entirely/completely proximal to the threaded body.

A fixation device includes a head, a tapered body coupled to the head and extending along a central longitudinal axis, and a flexible tail extending distally from the tapered body and defining a central bore therethrough. The flexible tail is movable from an initial configuration aligned with the central longitudinal axis to a deflected configuration that extends away from the central longitudinal axis when a force is applied to the flexible tail.