Abstract: An intramedullary device, having a first longitudinal axis extending between a proximal end and a distal end thereof, is provided. The intramedullary device may include a first bore and a second bore. The first bore may include a second longitudinal axis and may extend through the intramedullary device between a first opening and a second opening. The second longitudinal axis may define a first angle (?1) with the first longitudinal axis. The second bore may include a third longitudinal axis and may extend through the intramedullary device between the first opening and a third opening. The third longitudinal axis may define a second angle (?2) with the first longitudinal axis.

Abstract: The present disclosure includes an external fixator ring that includes a central opening, inner and outer ring surfaces and upper and lower ring surfaces. In some embodiments, one or more apertures are defined in the inner or outer surface for receiving securing devices. The apertures in the inner or outer surface are adapted to provide rigid attachment for connection struts while allowing for a range of motion between the interconnected rings. In some other embodiments, the external fixator ring further comprises angled flanges extending radially from the inner or outer surface. The angle flanges each include a mounting surface, apertures are defined in the mounting surface of the angle flanges for receiving securing devices.

Abstract: A bone screw assembly includes an anchor portion and a head portion, such as a rod-receiving portion, movably mounted to the anchor portion to allow for controlled angulation between the anchor portion and the head portion. The anchor portion is pivotable in one or more selected directions about an axis relative to the head portion. A restriction member, which may be a rod seat, prevents the anchor portion from pivoting in one or more different directions about another axis relative to the head portion and/or a spinal fixation element received in the head portion. The restriction member may be inserted in the head portion to control direction that the anchor portion pivots relative to the head portion. The restriction member may also serve as a compression member and/or rod seat for seating a spinal rod coupled to the bone screw assembly.

Abstract: Devices, systems, and methods are provided for driving an implant and applying counter torque. For example, a driver can include a handle, a driver shaft, and a counter torque shaft, the counter torque shaft being laterally offset from the driver shaft. A distal end of each shaft can mate with a specific type of implant and/or anatomy. The shafts can be removed and replaced from the device, allowing a user to select shafts having particular lengths and/or mating tips. In use, distal ends of the shafts can be fixed or constrained relative to one another and to an implant such that the counter torque shaft cannot orbit around the driver shaft. Rotating the handle can rotate the driver shaft, driving the implant. This can cause the counter torque shaft to try to orbit around the driver shaft, but the fixed/constrained ends restrict this motion, applying the counter torque.

Abstract: An apparatus is designed to attach an implant to bone in a manner that permits rotational adjustment of the implant about multiple axes prior to securement via the apparatus. The apparatus includes separate rotational and translational fasteners that can be individually locked to independently restrict rotation and translation of the implant relative to the bone. The rotational fastener includes an interpositional member, an expandable engagement member, and a rotational locking member that urges the expandable engagement member to advance along the interpositional member. The resulting expansion of the engagement member causes it to engage the implant. The rotational fastener is slidable along a fixation member implanted in the bone until the translational fastener is applied to restrict relative translation between the rotational fastener and the bone.

Abstract: A bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part for coupling the bone anchoring element to a stabilization element, the receiving part having a bore having a bore axis, a seat member configured to be arranged in the bore and to be rotatable around the bore axis, the seat member forming a seat for polyaxially holding the head, the seat member being configured to allow a greater pivot angle of the bone anchoring element in a first direction compared to other directions when the bone anchoring element and the seat member are in the receiving part, and a pressure member configured to contact the head to exert pressure onto the head, and to be connected to the seat member, such that the pressure member is rotatable together with the seat member around the bore axis.

Abstract: A bone screw having a screw member possessing a threaded section and a head and a receiving part at the head end for receiving a rod to be connected to the bone screw is provided. The receiving part has on open first bore and a substantially U-shaped cross-section having two free legs provided with a thread. Furthermore, the receiving part has a second bore on the end opposite to the first bore whose diameter is greater than that of the threaded section and smaller than that of the head. On the bottom of the first bore a seat for the head is provided. In order that the screw member can be pivoted to at least one side by an enlarged angle, the edge bounding the free end of the second bore viewed relative to the axis of the first bore is of asymmetric construction.

Abstract: Provided is an iliosacral polyaxial screw system. A multiple part insert member is provided to secure the screw to the housing of the assembly to accommodate screws in which the shank diameter of the screw is greater than the bottom opening of the screw housing or greater than the opening of a ring member designed to capture the head of the screw in the housing.

Abstract: The present disclosure relates, in some embodiments, to spinal fixation systems that may comprise a bone screw, a body, and a pressure cap. A bone screw may comprise a head at a proximal end, a bone connection element at a distal end, and an external protrusion on a head of a bone screw. A body may comprise a proximal end, a distal end, a mounting rod receiving channel at a proximal end, and a bone screw head receiving channel at a distal end. A portion of the mounting rod receiving channel may be operable to receive a compression element. A pressure cap may comprise a proximal end, distal end, and an internal recess on a distal end. An internal recess may be configured to mate with an external protrusion of a bone screw so as to limit the movement of a bone screw.

Abstract: A bone fixation system with variable z-axis translation is provided. The bone fixation system includes an outer tulip coupled to a bone fastener. An inner tulip, which provides a seat for an elongate fixation rod, is located inside the outer tulip. The inner tulip together with a seated rod is permitted to translate along the z-axis in an unlocked position. Also in the unlocked position, the bone fastener is free to angulate relative to the outer tulip. The bone fixation system includes a locked position in which the z-axis position of the inner tulip and rod relative to the outer tulip is fixed. Also in the locked position, the bone fastener is locked with respect to the outer tulip. The system may be adjusted between the locked and unlocked positions by way of a set screw or independently by rotation of the inner tulip relative to the outer tulip.

Abstract: A cervical polyaxial bone anchor includes a longitudinal connecting member receiver structure and a cooperating shank. The shank has a body and an integral head with first and second spherical surfaces of different radii and a plurality of spaced curvate apertures for receiving portions of the longitudinal connecting member to result in a greater angle of inclination of the shank with respect to the receiver. The receiver has an upper channel and a lower cavity that further includes an expansion area and an operational seat for a split retainer ring that captures and fixes the shank head within the receiver.

Abstract: A bone fixation system with variable z-axis translation is provided. The bone fixation system includes an outer tulip coupled to a bone fastener. An inner tulip, which provides a seat for an elongate fixation rod, is located inside the outer tulip. The inner tulip together with a seated rod is permitted to translate along the z-axis in an unlocked position. Also in the unlocked position, the bone fastener is free to angulate relative to the outer tulip. The bone fixation system includes a locked position in which the z-axis position of the inner tulip and rod relative to the outer tulip is fixed. Also in the locked position, the bone fastener is locked with respect to the outer tulip. The system may be adjusted between the locked and unlocked positions by way of a set screw or independently by rotation of the inner tulip relative to the outer tulip.

Abstract: A polyaxial bone screw assembly includes a receiver, a shank, an articulation structure for retaining the shank in the receiver and a compression insert for engagement with a longitudinal connecting member such as a rod. The articulation structure includes substantially spherical convex and concave surfaces that slidably engage both shank and receiver surfaces to provide compound articulation between the receiver and the shank. The receiver includes inwardly directed spring tabs engaging the insert and prohibiting rotation of the insert within the receiver.

Abstract: A surgical retractor comprising an attachment stick, provided with a tip end, intended to be inserted and attached to hard human tissue, such as bone tissue or a vertebra, and at least one shank, attached to the stick, for supporting and keeping organs, muscles and/or tissues at a desired position. The invention is characterized in that said attachment stick has a general shape of a circular cylinder wherein at least one recess is arranged in the outer surface of the stick which recess extends from the tip end in an axial direction of the stick, wherein the recess has a concavely curved shape as seen in a radial cross section taken across the axial direction of the stick.

Abstract: A bone fixation device comprises an elongated body extending from a head at a proximal end to a shaft at a distal end along a central longitudinal axis. A slotted opening extends distally into the head by a predetermined distance, the opening defining a spring portion on a lateral side thereof, the spring portion being biased toward the central longitudinal axis and configured to be deflectable away from the central longitudinal axis upon application of a radially expansive force thereto.

Abstract: Osteosynthesis constructs for treating bone fractures and bone screws for use in such systems are disclosed. The bone screws include a threaded front section configured for engagement with cortical bone, a threaded mid-section and an unthreaded neck section configured for limited movement within the near cortex of the bone. Osteosynthesis constructs of the type disclosed promote secondary healing by allowing for substantially parallel motion at the near and far cortex within the effective motion range for callus formation.

Abstract: A spine stabilization system is provided. The system utilizes a self-cutting rod having a sharp cutting edge that can be anchored to a patient's spine with pedicle screws. The system can be percutaneously delivered, low profile, and allow cutting of surrounding tissue rather than simply spreading the tissue apart during rod insertion.

Abstract: An orthopedic pin is used in a fixation device for treating fractures. The device has a body with holes to accept the pins. The pins have a layer of bioresorbable material thereon. Engagement between the pins and the body is initially through the bioresorbable material, which engagement rigidly fixes the relative angular orientation between the pins and the body when the device is applied to a bone. As the bioresorbable material is resorbed, the angular relation between the pins and the body is no longer rigidly fixed, thereby effecting a transformation from rigid osteosynthesis to flexible osteosynthesis to allow micromotion between the bone fragments which promotes healing.

Abstract: Plastic rod anchorage for the surgical treatment of the spine where the plastic rod (1) has at least two plane-parallel surfaces (1a) in order to uniformly clamp the rod (1) on its entire circumference.

Abstract: A bone anchoring assembly includes a bone anchoring element having a shank to be anchored in a bone or a vertebra, and a receiving part for receiving a rod. The assembly includes a rod made at least partly of a material which exhibits a material flow under pressure. The receiving part includes a channel with an approximately U-shaped cross-section with two free legs, a first locking element cooperating with the legs to secure the rod in the channel, and a second locking element cooperating with the first locking element and acting independently from the first locking element onto the rod. A pin-shaped projection is provided at the second locking element which comes into contact with the rod when tightening the second locking element, and at least one pin-shaped projection is provided in the channel which comes into contact with the rod when tightening the first locking element.

Abstract: A spinal alignment system is disclosed that includes a rod and a plurality of uniplanar screw assemblies that include a screw, a cap, and a housing. The screw and cap are configured such that the relative angular displacement between the screw and the cap is limited to a first limit angle in a first plane and to a second limit angle in a second plane that is perpendicular to the first plane, the second limit angle being larger than the first limit angle. The housing is coupled to the cap and configured to maintain the cap in proximity with the head of the screw. The housing has two elongated elements forming a U-shaped saddle. The alignment system also includes a plurality of locking cap assemblies that capture the rod within the U-shaped saddle and are tightened to fixedly couple the rod to the respective uniplanar screw assemblies.

Abstract: A receiver for engaging a bone stabilizing element includes a receiver portion connectable to the stabilizing element, and a base portion connectable to a bone of a patient. The base portion may connect to the bone with a bone screw, for example a polyaxial bone screw, and the receiver portion may connect to the stabilizing element, for example a rod, using a set screw. The receiver portion and the base portion are slideably connected to each other, coupled and constrained in relative movement, by overlapping portions. Axial rotation between the receiver portion and the base portion is enabled by changing the relative dimensions of overlapped portions.

Abstract: A bone anchoring element includes an anchoring section for anchoring in the bone and a receiving part connected to the anchoring section. The receiving part includes an opening suitable for accommodation of a stabilization rod having a rod axis, the opening being limited along the rod axis by two side walls. The side walls include guides orientated along the rod axis for guiding at least one connection rod therethrough.

Abstract: A spinal screw assembly is provided. The assembly may be provided with a screw and a movable head in which angulation of the screw relative to the movable head is constrained so that angulation within limits is allowed in one plane but lesser or no angulation is allowed in another plane. Methods to assemble the disclosed apparatus are also disclosed.

Abstract: A bone anchoring device includes a receiving part for receiving a rod, the receiving part has a first bore coaxial with a longitudinal axis and a second bore, and an anchoring element having a first end for insertion into the bone and a second end positionable within a second bore, the anchoring element being movable relative to the receiving part in limited angular range about the longitudinal axis, the angles lying in a single plane. The bone anchoring device further includes a fixation element cooperating with the receiving part to lock the anchoring element relative to the receiving part. The anchoring element is pivotable relative to the receiving part around one rotational axis transverse to the longitudinal axis.

Abstract: A surgical screw assembly is provided that includes a fastener including an elongate shaft having a proximal end and a distal end and a head at the proximal end. A tulip having an internal bearing surface and a distal end having a bore therethrough is provided to allow the distal end of the elongate shaft to pass therethrough. A first step feature located at a distal end portion of the bore and extending inwardly therefrom reduces the diameter of the bore to allow the distal end of the elongate shaft to pass therethrough, but prevents passage of the head therethrough. A second step feature located at a distal end portion of the bore, distally of the first step feature, further reduces the diameter of the bore to a dimension less than a dimension established by the first step feature, the further reduced dimension allowing the distal end of the elongate shaft to pass therethrough, but preventing passage of the head therethrough.

Abstract: A modular head-to-head cross connector or construct extension system comprising a fastener element driven into a bone in a first orientation, a first U-shaped body operable to receive the fastener element and operable to receive a first rod in a first rod receiving channel, and a first compression element driven adjacent to and against the first rod in the first rod receiving channel, thereby engaging the first rod against the fastener element in a second orientation independent of the first orientation of the fastener element. The system further comprises a second U-shaped body operable to receive first compression element and operable to receive a second rod in a second rod receiving channel, and a second compression element driven adjacent to and against the second rod in the second rod receiving channel, thereby engaging the second rod against the first compression element in a third orientation independent of the second orientation.

Abstract: A bone screw assembly including a bone screw that has a head portion with a base, a pair of arms extending upwardly from the base, and an internally threaded slot defined by the pair of arms, and a screw portion extending downwardly from the base of the head portion. The assembly further includes a set screw having a body with a threaded outer surface and a distal tip, wherein the distal tip comprises a truncated taper portion extending from a base to generally flat distal end. The threaded outer surface of the set screw is engageable within the internally threaded slot of the head portion of the bone screw.

Abstract: A receiver body for an elongated spinal fixation element includes a housing portion with one or more flanges extending outwardly. In one embodiment, the receiver body includes first and second flanges extending outwardly from the housing portion. The housing portion includes first and second slots that form a passage through the housing portion. Each flange has a circular perimeter edge and a chamfered section, the chamfered section having a notched undercut for engagement with an instrument. In another embodiment, the receiver body includes a housing portion having a circular flange with a first chamfered section and a second chamfered section diametrically opposite the first chamfered section. The first chamfered section has a first aperture that opens out beneath the flange, and the second chamfered section has a second aperture that opens out beneath the flange. The first and second apertures form diametrically opposed pivot-attachment points for an instrument.

Abstract: The present teachings provide one or more surgical implements for repairing damaged tissue, such as in the case of a spinal fixation procedure. A uniplanar bone anchor system for a fixation procedure is provided. The system can include a bone fastener including a head with a bearing surface and a shaft adapted to engage an anatomy. The system can also include a saddle, which can include a first bore formed about a longitudinal axis that receives the bone fastener and a coupling bore defined transverse to the longitudinal axis. The system can also include a coupling system, which can have a second bearing surface. The coupling system can be received through the coupling bore such that the second bearing surface of the coupling system can contact the bearing surface to permit the bone fastener to move in only one plane.

Abstract: A bone fastener includes a fixation portion configured to interface with boney tissue, a connection portion having a longitudinal axis and being configured to interface with an elongated support structure, and a flexible portion disposed between the fixation portion and the connection portion. The flexible portion is configured to permit flexure of the connection portion relative to the fixation portion. The flexible portion has a first set of opposed facing surfaces that mechanically limit the range of flexure in a first direction. It has a second set of opposed facing surfaces that mechanically limit the range of flexure in a second direction. The opposed facing surfaces are substantially transverse to the longitudinal axis.

Abstract: An implantable screw system for maintaining horizontal and/or vertical space during bone grafting procedures is provided, the screw comprising: a contoured head having a region adapted to support soft tissue and permit bone growth; a threaded shaft and a tip adapted to penetrate bone tissue; and where one screw contains a threaded chamber for engaging a second screw for additional space maintenance; wherein the screw(s) comprises cortical bone material. Methods of implanting one or more screws during bone grating procedures are disclosed.

Abstract: A bone plate system comprises a bone plate including a first surface and a second surface, the bone plate including at least one threaded aperture, the threaded aperture being tapered between the first surface and the second surface. The bone plate system further comprises at least one fastener including an elongate shaft and a threaded head, the threaded head being tapered between a proximal end of the threaded head and a distal end of the threaded head, wherein a plurality of circumferentially spaced recesses are formed in the threaded head and define a plurality of threaded tabs. The at least one fastener is configured for insertion within the at least one threaded aperture at a plurality of different insertion angles while achieving a locking engagement between the threaded head and the threaded aperture.

Abstract: A spinal implant (100) includes an anchoring part (110) adapted to be anchored to a vertebra and having first connecting elements (112), and a mounting part (120) including both an internal axial housing (151) to receive transversely a connecting rod (30), this axial housing being terminated beside the anchoring part (110) by a bottom (156), and also second connecting elements that cooperate with the first connecting elements to form a ball-joint connection between the anchoring part and the mounting part. The spinal implant includes retaining elements that are situated near the bottom of the axial housing of the mounting part that are adapted to fasten a locking member in a stationary so-called locking position in which the ball-joint connection formed by the first and second connecting elements is locked to fasten the anchoring part and the mounting part in rotation relative to each other about at least two orthogonal axes.

Abstract: There is provided a modular polyaxial pedicle screw assembly that includes various components which may be configured in various manners so as to provide different functionalities to the pedicle screw assembly. This advantageously decreases surgery time, reduces repetitive and tedious surgical steps, and allows for streamlining inventory of expensive medical equipment. In one embodiment, a pedicle screw assembly includes a pedicle screw, a rod holding element, a polyaxial insert, a rod, and a set screw. The pedicle screw includes a threaded shaft and a cap. The rod holding element includes a screw hole, an insert bearing area, a chamber, chamber walls, a saddle area, and a threading area. The insert is disposed within the chamber, and the insert defines a bearing surface, an upper surface, side walls and a receiving area.

Abstract: A bone fastener for use in orthopedic surgery for fixing an implant to bone includes a shaft and a head. The shaft is configured to drive into bone when rotated in a first direction. The head is formed on one end of the shaft and has proximal and distal sections. The head also has at least one cutting flute on the distal section of the head. The bone fastener may be used with a prosthetic implant, such as an acetabular shell or bone plate. In use, the bone fastener is driven into the bone through a hole in the prosthetic implant, with at least a portion of the head protruding beyond the hole of the implant. As the head is driven beyond the hole of the implant, the cutting flutes in the head help secure the head of the bone fastener into the bone, increasing the stability of the system.

Abstract: An apparatus is designed to attach an implant to bone in a manner that permits rotational adjustment of the implant about multiple axes prior to securement via the apparatus. The apparatus includes separate rotational and translational fasteners that can be individually locked to independently restrict rotation and translation of the implant relative to the bone. The rotational fastener includes an interpositional member, an expandable engagement member, and a rotational locking member that urges the expandable engagement member to advance along the interpositional member. The resulting expansion of the engagement member causes it to engage the implant. The rotational fastener is slidable along a fixation member implanted in the bone until the translational fastener is applied to restrict relative translation between the rotational fastener and the bone.

Abstract: A hinged bone screw and tool set is used for implanting such bone screws in a human spine, followed by the implantation of a longitudinal connecting member into the bone screws. The hinged bone screw includes a shank with an upper portion and a receiver with integral arms forming a U-shaped channel. A lower curved seat partially defining the U-shaped channel cooperates with an upper portion of the bone screw shank for hinged movement of the shank with respect to the receiver. The tool set includes an insertion tool, a bone screw driver, a reduction tool and a closure starter. The insertion tool includes a bone screw attachment structure and a laterally opening channel. The insertion tool further includes a threaded portion for cooperation with the reduction tool to provide synchronized placement of a closure structure in the bone screw receiver while reducing and capturing a longitudinal connecting member within the receiver.

Abstract: A surgical instrument for seating a pedicle screw may comprise a driver head, a pressure ring, or at least one guide element. The driver head may be configured for removably connecting to the pressure ring or the at least one guide element, or a pressure ring and at least one guide element. The removable connection of the pressure ring or the at least one guide element from the driver head may be twistable or slidable for purposes of exchanging the pressure ring or the at least one guide element from the driver head. The pressure ring or at least one guide element is configured to operatively engage the pedicle screw and transfer motion of the surgical instrument to the pedicle screw.

Abstract: A helicoil interference fixation system comprising: a helicoil comprising a helical body comprising a plurality of turns separated by spaces therebetween, the helical body terminating in a proximal end and a distal end, and at least one internal strut extending between at least two turns of the helical body; and an inserter for turning the helicoil, the inserter comprising at least one groove for receiving the at least one strut; the helicoil being mounted on the inserter such that the at least one strut of the helicoil is mounted in the at least one groove of the inserter, such that rotation of the inserter causes rotation of the helicoil.

Abstract: A pedicle screw system includes a multi-threaded bone fastener configured with a constant pitch and a placement tower assembly for delivery of the bone fastener.

Abstract: An apparatus (10) includes a fastener (16) engageable with a bone portion to connect a longitudinal member (12) to the bone portion. A housing (40) has a first passage (42) configured to receive the longitudinal member (12) and a second passage (44) extending transverse to the first passage. The fastener (16) extends through an opening (50) in the housing (40) into the second passage (44). A longitudinal axis (18) of the fastener (16) is positionable in any one of a plurality of angular positions relative to a longitudinal axis (46) of the second passage (44). A spacer (60) received in the second passage (44) of the housing (40) is engageable with the fastener (16) and the longitudinal member (12). A member (70) applies a force to prevent relative movement between the fastener (16) and the housing (40) and permit manual movement of the fastener (16) relative to the housing (40) against the force when the longitudinal member (12) is disengaged from the spacer (60).

Abstract: A fastener, for example a bone screw, is sized to pass into an aperture of an implant, for example a bone plate, the fastener having an anchor portion engageable with body tissue, and a head portion formed by an assembly of an insert and an anchor extension. The implant has an aperture with a reduced entry dimension. The insert and anchor extension cooperate to form a reduced dimension passable into the aperture, and an expanded dimension not passable out of the aperture. The size of the assembly is configurable by bending resilient tabs of the anchor extension or the implant, using ramped surfaces, or an expanding diameter of a threadable insert.

Abstract: Presented herein is a bone screw system that comprises a fixation element, a receiving element, coupling element, and a compression element. The fixation element can be a screw. The receiving element defines an internal bore sized to receive the shank portion of the fixation element and a seat adapted to support the head portion of the fixation element. The seat of the receiving element is shaped to substantially conform to an exterior portion of the head portion of the fixation element. A breakaway groove is positioned externally on each leg or leg extension. The breakaway groove extends inwardly at least partially through the wall of each leg or leg extension. This creates an aperture or slit in the wall leaving the wall with at least on, preferably a pair of leg attachments on each leg or leg extension adjacent the aperture.

Abstract: An anti-splay apparatus having a bridge and frangible connection points for use with mechanical fasteners having a shank portion and a receiving member with opposing arms is provided. The bridge may take a number of forms including a ring, a notched ring, a tube, or a notched tube and the connection points join the opposing arms of the receiving member with the bridge. Also provided is the anti-splay apparatus also having tabs connected between frangible connection points.

Abstract: Endosseous screw (1) for fixing a plate (102) to a bone site (300), comprising an at least partially threaded shaft (2), insertion means for inserting the screw into a bone site and a distal portion (33) provided for engaging said plate to fasten it to said bone site and comprising a head (3) having facets (30) defining an external peripheral profile provided for engagement with a tubular manipulating wrench, to allow the screw (1) to be extracted from the bone site (300) into which it has been inserted, wherein the facets (30) are curvilinear and the external peripheral profile defined by same facets (30) has a convex barrel-like shape, in order to allow a stable coupling between the tubular manipulating wrench and said profile, which is maintained during the untightening phase of screw from plate, even when said tubular manipulating wrench is oriented in an inclined direction with respect to a longitudinal axis (x) of the endosseous screw (1).

Abstract: A bone screw apparatus is provided for threaded engagement with a bone and, optionally, a medical device such as a bone plate. The bone screw has a shaft having a first end, a second end, and a first thread having a first pitch. The screw further includes a head having a proximal end, a distal end adjacent the shaft first end, and a second thread having a second pitch. The second thread has a variable pitch that increases in a proximal direction, but never exceeds the magnitude of any portion of the first pitch. Upon threaded engagement of the head with bone or a medical device, a compression force is generated which continuously decreases as the screw is further inserted.

Abstract: A fastening device for compressing first and second bones together includes a first member configured to extend entirely through the first bone and having a shaft that includes a distal threaded portion and an unthreaded portion. The threaded portion has an outer diameter that is not larger than the diameter of the unthreaded portion. A second member has a first threaded portion for securing to the second bone and a second threaded portion for engaging the threaded portion of the first member while the first member extends entirely through the first bone to secure the first and second members together and compress the first and second bones.

Abstract: A system for orthopedic repair of bones, the system may include a compression screw. The screw may include a blunt tip on one end with tapped threads to allow for greater bone fixation uniform across a threaded portion of the screw. The screw may also include springs, which may be Belleville washers, which provide appropriate compression and tension and prevent excessive loosening of the screw after surgery. The springs allow the screw to retract without losing pressure on the fracture site. The system may be minimally invasive for multiple fractures on a single bone such as calcaneal fractures, and stabilizing long bone fractures without bone plates.

Abstract: An anti-splay apparatus having a bridge and frangible connection points for use with mechanical fasteners having a shank portion and a receiving member with opposing arms is provided. The bridge may take a number of forms including a ring, a notched ring, a tube, or a notched tube and the connection points join the opposing arms of the receiving member with the bridge. Also provided is the anti-splay apparatus also having tabs connected between frangible connection points.