25 results about "Lag screw" patented technology

Intramedullary aiming systems, instruments, and methods of treating bone fractures are provided. The aiming systems may include one or more instruments configured to ensure optimal alignment and placement of one or more components of an intramedullary nailing system, such as anteversion alignment, anti-rotation, lag screw aiming, distal aiming, and other instruments suitable to enhance and optimize the surgical procedure.

This product is a double-threaded bolt with a small hexagonal head on one side, used in the attachment of through-posts and girders or waist beams in conventional wooden buildings. It is fitted and tightened with the internal female thread of a lag screw bolt with internal threads on both ends, which has a lag screw shape with high and large threads, a wide thread pitch, and a thread portion that bites into the wood material, and then the through-post and girder are tightened and fixed with a washer and a hexagonal nut. This product is used when attaching through-posts to beams by processing in two directions or three directions in a T-shape and tightening and fixing with bolts. In light of the fact that the long tenon processing of the girders results in a considerable reduction in the cross-sectional area of ​​the columns, which is a major cause of building collapse, such as "back-bending" depending on the magnitude and severity of shaking during an earthquake, this method eliminates the long tenon processing of the girders on the mounting surface of the through-columns, minimizing the reduction in cross-sectional area, and enables the integrated rigidity of the through-columns and girders. This high-rigidity joint between columns and girders is achieved by using lag screw bolts with internal threads at both ends and double-threaded bolts with small hexagonal heads on one end, with the girders in contact with the mortise and tenon processing of the girders processed into the through-columns, and the double-threaded bolts with small hexagonal heads on one end are pre-installed inside the mounting girders. The bolt is secured to the inside of the column by fitting and fastening it with the internal female threads of a lag screw bolt with internal threads at both ends. After fastening, the bolt is secured by inserting a tightening nut through a countersunk hole in the top and bottom of the beam, and then fastening it with a hexagonal nut via a spring washer. The body shape of the double-threaded bolt with a small hexagonal head on one end is such that a small hexagonal head of a certain shape extends from one end. The diameter of the threads between the peaks of the hexagonal head is slightly smaller than the diameter of the internal threads of the hexagonal nut, making it easier to pass the nut through when fitting the external thread portion of the double-threaded bolt with a small hexagonal head on one end with the washer and hexagonal nut for later tightening. It is characterized by having a small hexagonal head, an internally formed external thread portion of a certain outer diameter and length on the opposite side, then an intermediate unthreaded body portion of the same diameter, and the end has the shape of an external thread portion of a certain outer diameter and length, the thread pitch and outer diameter of the threaded portions formed on both sides are equal, and the overall length takes into account the position of the nut tightening portion machined into the top and bottom of the girder, the so-called length from the end of the girder that is in contact with the column surface to the same position, and the length for fitting with the internal female thread of the internal threaded lag screw bolt at both ends, the size of the diameter of the through column,This double-threaded bolt with a small hexagonal head on one end can be adapted to various lengths and outer diameters depending on the girder height, etc. Furthermore, the lag screw bolts with internal threads at both ends that engage with this bolt are selected according to the specifications of the bolt's threaded portion. In addition, to assist in maintaining the load-bearing capacity of the joint between the through-column and the girder during an earthquake, a shear shaft (pipe) is installed on the girder side beforehand. After the girder is in contact with the through-column, a drift pin is driven into the column to fix the column and girder. Then, the double-threaded bolt with a small hexagonal head on one end and the internal female threads of the lag screw bolts with internal threads at both ends are engaged and tightly fastened, and secured with a hexagonal nut. This allows for efficient and quick work, improving safety during work at heights and maintaining the load-bearing capacity of the building structure over the long term.

This invention provides wooden member connecting members, wooden seismic-resistant members, and high nuts and lag screw bolts that constitute them, which are less prone to buckling than conventional materials. [Solution] The device comprises a bolt 1 that engages with a gusset plate 9, a lag screw bolt 5 fixed to the bottom 4a side of the pilot hole 4 and having a hollow portion 55 that opens to the rear end 54 of the screw, a rod 6 having first threaded portions S1 and second threaded portions S2 at both ends 6a and 6b that screw into a high nut 7 and the lag screw bolt 5, and an expandable portion E extending between them, and a high nut 7 that screws into the bolt 1 and the rod 6, all arranged coaxially Q with the pilot hole 4. The high nut 7 or the lag screw bolt 5 has a non-threaded portion N within the hollow portions 71, 55 that allows displacement of the expandable portion E in the axial direction Z. The high nut 7 has a length L longer than the maximum assumed extension length MAX of the expandable portion E inserted into the pilot hole 4, and its displacement direction is constrained to the axial direction Z by the inner surface 4d of the pilot hole 4.

The invention discloses an intramedullary nail for outer side wall smashing type femoral intertrochanteric fracture, and belongs to the field of medical instruments, the intramedullary nail comprises a main nail, the main nail is connected with a tension bolt through a duct adjusting mechanism, and the main nail is provided with a lock nail; the hole channel adjusting mechanism is arranged on the main screw and used for adjusting the neck-shaft angle of the lag screw, the hole channel adjusting mechanism adjusts and changes the installation angle of the lag screw on the main screw through the structure of the hole channel adjusting mechanism, and then adjustment of the neck-shaft angle of the lag screw is achieved. The lag screw can cross the outer side wall to crush a fracture line, the problem of supporting failure caused by the fact that the screw penetrates through the fracture line in traditional fixation is avoided, meanwhile, the tip end of the lag screw is more accurately embedded into a main pressure bone small beam column (PCS) at the proximal end of the femur, and the holding force of the screw to the femoral head is improved; the main nail and the femoral shaft are tightly fixed through transverse locking, and rotation and axial displacement of the main nail in the medullary cavity are limited.

The utility model discloses an orthopaedic implant assembly which comprises an intramedullary nail, at least one threaded hole, at least one screw and at least one screw. The locking plate comprises at least one connecting hole and a plurality of locking holes; and the lag screw is provided with a threaded part, and the threaded part is connected with the threaded hole and the connecting hole so that the locking plate and the intramedullary nail can be connected together. The locking plate and the intramedullary nail are connected together through the lag screw, the lag screw and the intramedullary nail are stably connected through the threaded part, the locking plate can be supported, the situation that a steel plate is supported through a skeleton in practical application is reduced, recovery is facilitated, and therefore the problem that an implant fails is solved.

To provide a buckling-restrained brace that can effectively suppress the separation of restraining members even when the tensile force acting on the fasteners connecting the pair of restraining members during higher-order buckling of the core material causes the restraining members to separate. [Solution] The buckling-restraining brace 100 has a steel plate-shaped core material 10 and a wooden restraining body 20 formed by a pair of restraining members 30. The outer circumferential surface 31 of one restraining member 30A is provided with a plurality of countersunk grooves 34, and a first through hole 38 is provided that extends from each countersunk groove 34 to the contact surface 32. A lag screw bolt 50, equipped with male threads 51 and female threads 52, is embedded in the other restraining member 30B from the contact surface 32 to the interior, and a plurality of fasteners 60 are inserted through the corresponding first through holes 38 and screwed into the female threads 56.

The application discloses a femoral intramedullary fixation device, which comprises a main nail arranged in the femoral medullary cavity along the femoral axis, a lag screw arranged in the proximal end of the main nail and used for connecting the proximal end of the femur and the broken femoral head, and a stabilizing screw arranged in the proximal end of the main nail and used for connecting the femoral head and arranged non-parallelly with the lag screw. The application can improve the early fixation effect of the femoral intramedullary fixation device, reduce the rotation and movement probability of the lag screw in the femoral neck, and effectively prevent the proximal end of the femur from turning inwards and other adverse effects by arranging the lag screw non-parallelly with the stabilizing screw.

A fracture fixation system includes an implant defining a transverse bore extending along a bore axis, the bore being defined by first and second passages that each extend along the bore axis. The fracture fixation system further includes a lag screw configured to be inserted through the second passage, wherein a distal portion of the lag screw includes a thread. The fracture fixation system further includes a bolt configured to be inserted through the first passage, wherein a lateral side of the bolt defines a negative thread adapted to receive the thread of the lag screw. The negative thread includes a transition portion configured to align the thread of the lag screw with the negative thread of the bolt.

A trochanteric fracture nail system includes: a trochanteric fracture nail and a lag screw system adapted and configured for fixation medially through the trochanteric fracture nail. The trochanteric fracture nail includes: a substantially cylindrical wall defining a longitudinal bore; at least one lateral bore intersecting the longitudinal bore; and a detent on an inner surface of at least one of the at least one lateral bore. The lag screw system includes a lag screw and an interference member. The lag screw includes: an annular body defining a substantially hollow central bore; and a keel located along the annular body. The keel is adapted and configured to substantially lie within an outer profile of the annular body when in a neutral position. The interference member is adapted and configured to displace the keel radially to resist motion of the annular body by engaging with the detent of the trochanteric fracture nail.

An intramedullary (“IM”) nail and surgical technique or method. The IM nail includes a body including an opening for receiving a lag screw and a compression screw. The body further including one or more screw openings for receiving a bone screw. The surgical technique enables a surgeon to selectively prevent or allow movement (e.g., medialization) of the IM nail within the patient's intramedullary canal. The position of the IM nail can be selectively secured within the patient's intramedullary canal depending on surgeon preference and / or depending on the fracture pattern being treated. In use, the surgeon can elect to either secure the position of the IM nail within the patient's intramedullary canal thereby preventing movement (e.g., medialization) of the IM nail within the patient's intramedullary canal, or the surgeon can allow the IM nail to move (e.g., medialize) within the patient's intramedullary canal.

An orthopedic fixation device (e.g., an intramedullary ("IM") nail or bone plate) including a lag screw and a compression screw, the compression screw being nested with the lag screw. In accordance with one or more features of the present disclosure, the compression screw may include a partially non-threaded medial segment, an enlarged diameter, and / or a cannulated bore. In addition, and / or alternatively, the lag screw may be provided as an integrated assembly including a lag screw and an outer sleeve to enable the lag screw to telescope or slide relative to the outer sleeve and IM nail.

A fracture fixation system includes an intramedullary nail having a lag screw bore extending along a lag screw bore axis and a cannulated channel extending along a cannulated channel axis and in communication with the lag screw bore, the lag screw bore axis and the cannulated channel axis extending transverse to each other, a threaded lag screw configured for insertion within a first portion of the lag screw bore, a bolt configured for insertion within a second portion of the lag screw bore, a compression screw extending within the bolt, and a set screw configured for insertion into the cannulated channel and into engagement with the compression screw and / or the bolt.

The utility model provides an acetabulum front and back column through the acetabulum bottom horizontal line pull screw setting device, including the base plate, the upper surface rotationally connected with the guide piece of base plate, the base plate and guide piece are equipped with the mutual adaptation's guide channel, the guide channel can pass through the guide needle, the outside surface of guide piece is connected with the positioning structure for the close contact of ischial obturator outer edge, and the positioning structure is equipped with the adjusting part that can adjust the distance between positioning structure and guide piece, because the patient's anatomical structure has individual difference, the size, shape, front and back column's spatial position relation etc. of different patient's acetabulum are not exactly the same, the distance between adjustable positioning structure and guide piece, can make the setting device better close patient's specific acetabulum form, improve the accuracy and safety of screw setting, reduce the setting deviation caused by individual difference.

To provide a method for fastening lag screw bolts to wooden members that enables smooth threading of the lag screw bolts and reduces construction time. [Solution] A method for fastening a lag screw bolt 30, which has a threaded portion 10 and a body portion 20, to a wooden member 50, comprising a pre-drilling step of drilling a pre-drilled hole 52 in the wooden member 50, and a fastening step of fastening the lag screw bolt 30 by screwing it into the pre-drilled hole 52, wherein in the pre-drilling step the pre-drilled hole 52 the pre-drilled hole 52 is machined so that a first hole 53 corresponding to the threaded portion 10 has a hole diameter φ1 which is the same as or approximately the same as the root diameter and is continuous with a second hole 54 corresponding to the body portion 20 has a hole diameter φ2 which is the same as or approximately the same as the nominal diameter, and in the fastening step the lag screw bolt 30 is screwed into the pre-drilled hole 52 after applying a viscous fluid 70 to the tip 15 or near the tip of the threaded portion 10.

This utility model relates to a tension screw and intramedullary nail system, including a tension screw body having a tension screw head and a tension screw tail. The outer wall surface of the tension screw head is provided with a plurality of external threads for implantation, extending to the end of the tension screw head. A first groove and a second groove are symmetrically arranged along the central axis on the outer wall surface of the tension screw body, both extending to the end of the tension screw tail. The first groove and the second groove are respectively provided with a plurality of first and second threaded grooves for adaptation to a compression screw. Both the first and second threaded grooves are located at the tension screw tail, making the tension screw more flexible in use.

This product is a lag screw bolt with a hexagonal head on one side and internal threads on both ends that can reduce the load by responding to the tensile force applied to each tightening and fixing bolt itself so that the column and beam of the attached wooden material become integrally rigid when connecting beams or girders on both sides of a column in a wooden building using high-strength connecting hardware.The bolt has a thread shape like a lag screw with a high and large thread pitch and a shape where the threaded part bites into the wooden material, and the hexagonal head on one side and internal threads on both ends are first tightened before the bolt is tightened. The bolt is inserted into the wooden pillar and fixed, and then can be individually fitted with the tightening fixing bolt. The main body shape of the one-sided hexagonal head double-ended internally threaded lag screw bolt has a hexagonal head of a certain shape from one end, and the neck and threaded parts of the bolt are formed integrally in the opposite direction. It is characterized by the fact that the outer diameter of the neck is of a certain diameter and the outer diameter of the threaded part of the bolt are the same, the threaded part has high and large threads, and the thread pitch is also wide, so that when rotational force is applied, it bites into the wooden material and drives it forward while cutting the threads. The threaded portion extends to a fixed length, and the connecting hardware has an internal threaded portion that can be tightened with a high-strength hexagonal head bolt, and a mating female thread is cut to a fixed depth or length according to the diameter of the threaded portion of the high-strength hexagonal head bolt, as a common point on both ends, starting from the tip of the hexagonal head portion on one side of the one-side hexagonal head double-ended internally threaded lag screw bolt and the end of the lag screw-shaped thread on the other side. When attaching and fixing connecting hardware using a hexagonal head lag screw bolt, a pilot hole is drilled into the wooden material to be attached, with the diameter of the lag screw bolt's valley. The hexagonal head of the lag screw bolt with a hexagonal head on one side and internal threads on both ends is rotated and inserted using a jig and power tool, and first assembled and fixed to the pillar. After that, high-strength hexagonal head bolts are rotated and inserted into the internal female threads on both ends of the lag screw bolt with a hexagonal head on one side and internal threads on both ends through the fastening holes on the back of the connecting hardware, and then the bolts are fitted into the female threads and tightened to fix the connecting hardware.By being fixed in place without leaving a gap between the bolt pilot hole in the attached wooden material, the single-sided hexagonal head, double-ended internally threaded lag screw bolt and the wooden column function as a single unit and can withstand the tensile load generated in the tightening fixing bolt and the attached connecting hardware. This reduces the burden of tensile stress on each high-strength hexagonal head bolt when tightening the connecting hardware, maintaining the strength of the connecting hardware itself for a long period of time, and also prevents beam sagging due to rattles in the connecting hardware caused by vibrations during earthquakes, making it possible to maintain the strength of the building structure for a long period of time.

The lag screw comprises a screw rod, a nut and a thread, a screw tip comprises two tip bodies, and a plum blossom groove is formed in one end of the screw rod. The screw tip comprises the two tip bodies, so that the penetrating capacity of the lag screw for treating lumbar spondylolysis is improved, vertebral pedicle cortex can be just punctured, the risk of lower limb pain caused by nerve injury can be reduced, and the screw can be screwed more conveniently and rapidly; and the plum blossom groove is formed in one end of the screw rod, so that the holding force of the screw is better when the screw is tightened and taken out, the risk that the contact point slips is effectively reduced, and the lumbar vertebra isthmus healing is facilitated.

The present disclosure is directed to a drill and implant device and methods for using the same. The device is configured to automatically drill into, for example, a bone to different depths depending on whether the device is in a manual mode, a first cortex drill mode, a second cortex find mode, a second cortex drill mode, a fixed depth mode, or a lag screw mode.

The utility model relates to the technical field of intramedullary nail fixation, in particular to a miniature intramedullary nail which comprises a lengthened main nail and a near-end head fixedly arranged at one end of the lengthened main nail, and further comprises a first near-end nail, a second near-end nail, a third near-end nail and a fourth near-end nail, the second near-end nail is inserted into an inclined nail hole in a threaded mode, the inclined nail hole is formed in the end, away from the lengthened main nail, of the near-end head, and the first near-end nail and the second near-end nail are used for fixedly connecting the lengthened main nail to the position between a repaired or reconstructed femoral head and a thighbone in the thighbone reconstruction operation. The proximal end of the lengthened main nail is fixed through the first lag screw or the combination of the first lag screw and the second lag screw or the combination of the first proximal end nail and the second proximal end nail, and can be respectively suitable for femoral neck and distal femur fracture conditions or osteoporosis fracture conditions or femoral head repair and reconstruction conditions; and the applicable fracture condition range of the lengthened main nail is expanded.

This product primarily relates to the joining of CLT (Cross-Laminated Timber) structural elements in highly earthquake-resistant wooden buildings. CLT refers to a wood-based material called "cross-laminated timber," which is made by laminating and bonding multiple layers of plank-shaped wood vertically and horizontally. It is characterized by its wide, thick, and large, single-piece form, enabling large-span roofs, floors, and walls. Due to these characteristics, CLT is used as a highly earthquake-resistant structural material in modern commercial buildings, offering lighter weight and superior insulation compared to steel frames. It is also used in large-scale wooden buildings. It is becoming popular as "architecture," and the current construction methods include 1) a structure composed only of structural panels for the roof, walls, and floor, and 2) a structure that is constructed in combination with a wooden frame. In the case where only structural panels are used, the connection between the roof and walls, and between the walls and floor, or in the case where a wooden frame is used, the connection between the beams and floors, beams and walls, and walls and columns, is generally done by driving long nails or long screws with flat plates or L-shaped steel plates attached. As mentioned above, the construction of this product in CLT buildings has mainly involved on-site work based on a lot of manual work, and each Considering that the joining of panels involved the use of numerous flat steel plates for joining, and a considerable amount of work with long nails and screws, and that each panel itself was wide, thick, and heavy, and that the exterior wall substrate involved the treatment of a considerable number of flat steel plates, protruding nail heads, or screw heads, making it an extremely complicated and difficult task when working at heights, this product was created. Regarding the joining of each panel, much of the work was pre-fabricated in the factory, and this product is a pin-driven flange-type lag screw bolt designed to enable safe and efficient bolt and steel pin joining during on-site work at heights, while also aiming for high rigidity. Its features include a circular flange on one end for use as a round washer, with a female thread inside the center of the flange having a fixed inner diameter, length, and depth, and on the outside, a lag screw shape with high, large threads and a wide thread pitch that bites into wood material, with a fixed length; and subsequently, a round bar-shaped shaft with the root diameter of the threads forming the outer diameter, with a fixed length, and at least one through-hole for driving in a steel pin, thus integrating two features into a single shape.In the joining of roof or floor panels to wall panels in CLT construction, pre-drilled holes slightly larger than the diameter of the round bar shaft (which is the root diameter of the pin-driven flanged lag screw bolt) are made in the factory for the roof, floor, and wall panels. These pre-drilled holes are then used as through holes, and the pin-driven flanged lag screw bolts are rotated and inserted in advance. During construction, the round bar shaft is inserted into the pre-drilled holes at a certain depth in the upper part of the wall panels erected on both sides. After that, steel drift pins are driven into the pre-drilled pin-insertion locations in the wall panels, thereby easily joining the roof or floor panels to the wall panels. The main body shape of the pin-driven flange-type lag screw bolt is such that a circular flange portion with a fixed outer diameter and thickness, which serves as a round washer larger than the outer diameter of the external thread, is integrally formed on one end of a bolt of a fixed length, and the neck portion of the threaded part is attached to the other end of the bolt, and the neck portion and the outer diameter of the bolt's external threaded part are the same diameter, and the threads are tall and large, and the thread pitch is wide, and the threaded part has the shape of a lag screw, which bites into wood material when rotational force is applied and advances while cutting threads of the same shape, and the threaded part has a fixed outer diameter and root diameter and extends for a fixed length, and then a round rod-shaped shaft which is integrally formed with the root diameter of the threaded part as the outer diameter and extends for a fixed length to the end, and a through hole of a fixed diameter for pin insertion is machined at a fixed position from the end of the shaft, and from the tip of the flange portion, an inward portion is formed with respect to the center of the flange portion. This pin-driven flanged lag screw bolt is characterized by having a male thread of a fixed outer diameter and a female thread that can be fitted into it, both of which are machined to a fixed length and depth. When joining panels using this pin-driven flanged lag screw bolt, a pilot hole is drilled in the panel of the attached wood material with a diameter slightly larger than the diameter of the root of the lag screw-shaped bolt and the shaft of the same diameter. After countersinking to match the shape and thickness of the circular flange portion, the flange portion of the pin-driven flanged lag screw bolt is rotated using a jig. The flange portion has a square groove with a fixed depth and a width slightly larger than the outer diameter of the inserted bolt, and a small diameter through hole around the periphery. By rotating and inserting the bolt into the pilot hole using a dedicated jig and power tool, and then screwing it in and fixing it in place, it becomes one with the wood material, eliminating looseness caused by shrinkage due to the aging of the wood.This product ensures long-term structural integrity by maintaining the load-bearing capacity of the joints of each structural panel and eliminating looseness in the joints caused by seismic vibrations, thereby enabling the long-term structural integrity of the building. Its features include the ability to customize the overall length to match the thickness of each structural panel, the outer diameter, root diameter, thread pitch, and thread length of the threaded section according to the required load-bearing capacity, the diameter of the internal female thread, the length of the round bar shaft, and the number of mounting pin holes. Furthermore, using high-strength hexagonal bolts for the male threads that engage with the internal female threads during construction significantly increases the joint strength, resulting in numerous advantages. It can also be used in conjunction with conventional CLT construction methods using sheet steel or L-shaped steel plates with nails or screws, depending on the application.

This invention provides a fracture treatment fixation device for femoral fractures that can more reliably treat proximal femoral fractures, including cases where the posterior wall portion is not separated. [Solution] A fracture treatment fixation device for treating a femoral fracture, comprising: an intramedullary nail inserted into the femoral cavity; a lag screw positioned to penetrate the intramedullary nail diagonally upward and enter the femoral head and femoral neck; an anterior wall plate applied to the anterior wall of the femoral trochanter; and an anterior wall plate fixing pin positioned to penetrate the intramedullary nail and to fix the anterior wall plate to the anterior wall of the femoral trochanter, wherein the anterior wall plate fixing pin is configured to be screwable into the intramedullary nail.

A fracture fixation system (100) includes an implant (102) defining a transverse bore extending along a bore axis, the bore being defined by first and second passages (115a, 115b) that each extend along the bore axis. The fracture fixation system further includes a lag screw (130b) configured to be inserted through the second passage, wherein a distal portion (134b) of the lag screw includes a thread. The fracture fixation system further includes a bolt (130a) configured to be inserted through the first passage, wherein a lateral side of the bolt defines a negative thread adapted to receive the thread of the lag screw. The negative thread includes a transition portion configured to align the thread of the lag screw with the negative thread of the bolt.

To provide a buckling-restraining brace that can suppress the separation of restraining members even when the tensile force acting on the fasteners connecting the pair of restraining members during higher-order buckling of the core material causes the restraining members to separate, without compromising the aesthetic appearance. [Solution] The buckling-restraining brace 100 has a steel plate-shaped core material 10 and a wooden restraining body 20 formed by a pair of restraining members 30. Multiple countersunk grooves 34 are provided on the outer circumferential surface 31 of one of the restraining members 30A. A first lag screw bolt 50A, equipped with a male thread 51 and a first through hole 52, is embedded in the restraining member 30A, extending from each countersunk groove 34 to the contact surface 32. A second lag screw bolt 50B, equipped with a male thread 55 and a female thread 56, is embedded in the other restraining member 30B from the contact surface 32 to the interior. Multiple fasteners 60 are inserted through the corresponding first through holes 52 and screwed into the female threads 56.

An orthopedic fixation device (e.g., an intramedullary (“IM”) nail or bone plate) including a lag screw and a compression screw, the compression screw being nested with the lag screw. In accordance with one or more features of the present disclosure, the compression screw may include a partially non-threaded medial segment, an enlarged diameter, and / or a cannulated bore. In addition, and / or alternatively, the lag screw may be provided as an integrated assembly including a lag screw and an outer sleeve to enable the lag screw to telescope or slide relative to the outer sleeve and IM nail.

A lag screw assembly includes a lag screw and a blade. The lag screw includes a shank extending from a proximal end to a distal end along a longitudinal axis, the shank having an outer surface, and the shank having a threaded portion at the distal end. The lag screw further includes a groove formed in the shank and open to the outer surface, the groove extending along the shank between the proximal and distal ends. At least a portion of the groove defines a path that extends around and along the longitudinal axis on the outer surface. The blade has a head and a leg extending therefrom for slidably engaging the groove.