Femoral far-end outer side locking bone fracture plate with inner side column support
By designing an anatomical distal lateral locking bone plate with medial column support, a triangular fixation is formed using the inclined third nail hole, the problem of insufficient stability of the unilateral steel plate is solved, and better biomechanical performance and shorter Operation time.
Patent Information
- Application Number
- CN202420696547.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-04-07
AI Technical Summary
In the current treatment of distal femur fractures, the unilateral steel plate has poor anti-shearing and torsional force, resulting in delayed healing or non-healing of the fracture, and the double-fixation surgery is long and the trauma is great.
A lateral locked bone junction plate on the distal end of the femur with medial column support is designed, adopting an anatomical design, with an inclined third nail hole in the middle of the plate to form triangular fixation, increasing stability, and achieving a double fixation effect through a single bone junction plate.
It improves the stability of the distal femur, reduces complications of nonunion and internal fixation failure, shortens the surgical time, and reduces surgical trauma.
Smart Images
Figure CN222265370U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of orthopedic implants, in particular to a distal femoral lateral locking bone fracture plate with a medial column support. Background Art
[0002] The distal femur includes the supracondylar and intercondylar regions of the femur. According to literature reports, the overall annual incidence of distal femoral fractures is about 8.7 / 100,000, accounting for about 0.4% of total body fractures and 6% of all femoral fractures. Epidemiological studies have shown that distal femoral fractures have a characteristic bimodal distribution, with the peak occurring in men under 40 years old and women over 50 years old. In young people, high-energy injuries such as traffic accidents are more common, while in the elderly, low-energy injuries such as falls while walking can cause fractures due to osteoporosis and other reasons. As the population ages, the incidence of distal femoral fractures will also increase.
[0003] Currently, the preferred treatment for distal femoral fractures is open reduction and internal fixation surgery, the treatment goal of which is to restore the force line of the lower limb, achieve fracture healing, and restore knee joint activity at an early stage. Early fixation of distal femoral fractures often showed a high probability of nonunion, implant failure, varus collapse, and other problems. Relevant treatments have made continuous progress in the past 60 years. Currently, there are many surgical treatment options for distal femoral fractures, including open or minimally invasive approaches to insert locking plates, intramedullary nail fixation, etc., see utility model patents CN208905683U, CN210095888U, and CN212140567U, etc.
[0004] However, unilateral plates are poor at resisting shear and torsion forces, and delayed union or nonunion of fractures is prone to occur when the blood supply to the affected side is poor. Literature reports that the rate of nonunion and implant failure is still 10%-20%. The cause of distal femoral nonunion may be related to the instability of the medial condyle and the inability to provide sufficient biomechanical support. To solve this problem, the concept of "double fixation" has been proposed, that is, both the inner and outer sides are fixed with plates or plates combined with intramedullary nails, etc., but this undoubtedly greatly prolongs the operation time and increases surgical trauma. Utility Model Content
[0005] The technical problem to be solved by the utility model is to provide a locking bone fracture plate with medial column support for the distal lateral side of the femur, which has good supporting effect, shortens the operation time and reduces the operation trauma.
[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0007] A distal femoral lateral locking bone fracture plate with medial column support, comprising a plate body, wherein:
[0008] The plate body is designed in an anatomical shape as a whole;
[0009] The proximal end of the plate body is provided with a first nail hole for accommodating a first bone screw, and the distal end of the plate body is used to be placed at the femoral condyle and is provided with a second nail hole for accommodating a second bone screw;
[0010] The middle portion of the plate body is used to be placed at the upper portion of the femoral condyle and is provided with a pair of third nail holes for accommodating a third bone screw, wherein the pair of third nail holes are respectively located on both sides of a center line in the length direction of the plate body, and the pair of third nail holes are inclined at a certain angle so that the third bone screw can be screwed through the medial condyle cortex to the opposite side and does not intersect with the second bone screw in the second nail hole, thereby forming a triangular fixation.
[0011] Furthermore, the pair of third nail holes are arranged at intervals along the length direction of the plate body.
[0012] Furthermore, the distance between the pair of third nail holes is 0.8-2 cm.
[0013] Furthermore, the angle between the axis of the third bone screws in the pair of third screw holes and the plane where the plate body is located is 30-60 degrees.
[0014] Further, the first nail hole is a locking screw / cortical bone screw mixed screw hole;
[0015] And / or, the number of the first nail holes is at least two and they are arranged at intervals along the length direction of the plate body.
[0016] Furthermore, the number of the second nail holes is at least two and they are arranged at intervals.
[0017] Furthermore, the number of the second nail holes is seven, three of which are arranged at intervals along the length direction of the plate body, and the other four nail holes are divided into two pairs of nail holes along the width direction of the plate body, and the two pairs of nail holes are arranged at intervals between the three of the nail holes.
[0018] Further, the second nail hole is a locking screw hole;
[0019] And / or, an instrument positioning hole is provided between the second nail holes.
[0020] Furthermore, the angle between the axis of the second bone screw in the second nail hole and the plane where the plate body is located is 70-110 degrees.
[0021] Furthermore, the proximal end of the plate body gradually becomes thinner toward the proximal side;
[0022] And / or, the proximal and distal edges of the plate body are both designed with smooth transition.
[0023] The utility model has the following beneficial effects:
[0024] The utility model discloses a locking bone fracture plate for the distal end of the femur with a medial column support, wherein the plate body is designed as a whole with an anatomical shape, which can increase the attachment area between the bone fracture plate and the outer side of the distal end of the femur, thereby achieving better stability; the proximal end of the plate body is provided with a first nail hole for accommodating a first bone screw, so as to firmly fix the proximal end of the plate body to the bone surface; the distal end of the plate body is used to be placed at the position of the femoral condyle and is provided with a second nail hole for accommodating a second bone screw, so as to fix the fracture of the femoral condyle; the middle part of the plate body is used to be placed at the position of the upper part of the femoral condyle and is provided with a pair of third nail holes for accommodating a third bone screw, and the pair of third nail holes are respectively located at On both sides of the center line of the plate in the length direction, a pair of third nail holes are inclined at a certain angle so that the third bone screw can pass through the medial condyle cortex to the opposite side and does not intersect with the second bone screw in the second nail hole, thereby forming a triangular (conical) fixation. The triangular structure provides stable support for the medial column, with good support effect, making the medial condyle fixation more stable, and its biomechanical properties are stable, reducing the occurrence of complications such as postoperative distal femoral nonunion, internal fixation failure, and femoral condyle varus collapse, and realizing the "double fixation" concept through a single bone plate. Compared with the existing "double fixation" device, it shortens the operation time and reduces surgical trauma. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the distal lateral femoral locking bone plate with medial column support in one direction of the utility model;
[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the distal femoral lateral locking bone plate with medial column support in another direction of the utility model;
[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the distal femoral lateral locking bone plate with medial column support and the bone screw in one direction after being matched with the utility model;
[0028] Figure 4 It is a schematic diagram of the three-dimensional structure in another direction of the utility model after the distal femoral lateral locking bone plate with medial column support and the bone screw are matched;
[0029] Figure 5 The utility model is a schematic diagram of the use state of the distal femoral lateral locking bone fracture plate with medial column support. DETAILED DESCRIPTION
[0030] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.
[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0032] The utility model provides a locking bone plate for the outer side of the distal femur with a medial column support, such as Figure 1-5 As shown, it includes a plate body 1 (specifically, it can be a steel plate), wherein:
[0033] The plate body 1 is designed in an anatomical shape as a whole;
[0034] The proximal end of the plate body 1 is provided with a first nail hole 11 for accommodating the first bone screw 2, and the distal end of the plate body 1 is used to be placed at the femoral condyle and is provided with a second nail hole 12 for accommodating the second bone screw 3;
[0035] The middle part of the plate body 1 is used to be placed on the upper part of the femoral condyle and is provided with a pair of third nail holes 13 for accommodating the third bone screw 4. The pair of third nail holes 13 are respectively located on both sides of the center line of the length direction of the plate body. The pair of third nail holes 13 are inclined at a certain angle so that the third bone screw 4 (that is, the oblique locking screw) can be nailed through the medial condyle cortex to the opposite side and does not intersect with the second bone screw 3 in the second nail hole 12, thereby forming a triangular (conical) fixation.
[0036] When in use, the plate body 1 is held and attached to the outer side of the distal end of the femur, so that the first nail hole 11 is attached to the middle and lower part of the femur, the second nail hole 12 is attached to the position of the femoral condyle, and the pair of third nail holes 13 are attached to the upper part of the femoral condyle. Then, the first bone screw 2, the second bone screw 3 and the third bone screw 4 are held and driven into the designated positions along the first nail hole 11, the second nail hole 12 and the pair of third nail holes 13 respectively, wherein the third bone screw 4 is screwed through the medial condyle cortex to the opposite side and does not intersect with the second bone screw 3, thereby forming a triangular (conical) fixation, and the implantation is completed (see Figure 3-5 ).
[0037] The utility model discloses a locking bone fracture plate for the distal end of the femur with a medial column support, wherein the plate body is designed as a whole with an anatomical shape, which can increase the attachment area between the bone fracture plate and the outer side of the distal end of the femur, thereby achieving better stability; the proximal end of the plate body is provided with a first nail hole for accommodating a first bone screw, so as to firmly fix the proximal end of the plate body to the bone surface; the distal end of the plate body is used to be placed at the position of the femoral condyle and is provided with a second nail hole for accommodating a second bone screw, so as to fix the fracture of the femoral condyle; the middle part of the plate body is used to be placed at the position of the upper part of the femoral condyle and is provided with a pair of third nail holes for accommodating a third bone screw, and the pair of third nail holes are respectively located at On both sides of the center line of the length direction of the plate body, a pair of third nail holes are inclined at a certain angle so that the third bone screw can be screwed through the medial condyle cortex to the opposite side and does not intersect with the second bone screw in the second nail hole, thereby forming a triangular (conical) fixation. The triangular structure provides a stable support for the medial column, and the support effect is good, making the medial condyle fixation more stable. Its biomechanical properties are stable, reducing the occurrence of complications such as postoperative distal femoral nonunion, internal fixation failure, and femoral condyle varus collapse, and realizing the "double fixation" concept through a single bone plate. Compared with the existing "double fixation" device, it shortens the operation time and reduces surgical trauma. The utility model is suitable for treating and fixing distal femoral (supracondylar / intercondylar) fracture reduction.
[0038] The key point of the utility model is that two third nail holes which are not on the same center line in the length direction of the plate body are provided at the middle part of the plate body and are used to fix the upper part of the femoral condyle, so that the third bone screw passing through the third nail hole forms a large angle with the plate body, passes through the medial condyle cortex to the opposite side, and does not intersect with the second bone screw in the second nail hole at the femoral condyle, thereby forming a triangular (conical) fixation, making the medial condyle more stable, and providing support for the medial column of the distal femur.
[0039] like Figure 1-2 As shown, a pair of third nail holes 13 can be spaced apart along the length direction of the plate body to form a better triangular (conical) fixation, provide a more stable support for the inner column, and have a good support effect. The distance L between the pair of third nail holes 13 can be 0.8-2 cm, such as 0.9 cm, 1.2 cm, 1.5 cm, etc., to achieve a better support effect. Figure 3 As shown, the angle α between the axis of the third bone screw 4 in a pair of third nail holes 13 and the plane where the plate body is located is preferably 30-60 degrees, for example 35 degrees, 40 degrees, 55 degrees, etc., so that the third bone screw 4 can be nailed through the medial condylar cortex to the opposite side without intersecting the second bone screw 3.
[0040] Continue as Figure 1-2 As shown, the first nail hole 11 can be a locking screw / cortical screw mixed screw hole; the number of the first nail holes 11 can be at least two and they are arranged at intervals along the length direction of the plate body, and the number can be selected according to the length of the distal femoral fracture line. In the embodiment shown in the figure, the number of the first nail holes 11 is 5.
[0041] The number of the second nail holes 12 can be at least two and they can be spaced apart. In the embodiment shown in the figure, the number of the second nail holes 12 is seven, three of which are spaced apart along the length direction of the plate body, and the other four nail holes are divided into two pairs of nail holes along the width direction of the plate body, and the two pairs of nail holes are spaced apart between three of the nail holes. This design can be better used for fixation of femoral condyle fractures, and the angles of the seven second nail holes 12 can be different. The second nail holes 12 can be locking screw holes. Instrument positioning holes 14 can be provided between the second nail holes 12 to accurately and quickly position the locking screws (i.e., the second bone screws 3) in the second nail holes 12. As shown Figure 3 As shown, the angle β between the axis of the second bone screw 3 in the second nail hole 12 and the plane where the plate body is located can be 70-110 degrees, such as 80 degrees, 90 degrees, 100 degrees, etc., which is more convenient for fixation of femoral condyle fractures.
[0042] like Figure 1-4 As shown, the proximal end of the plate body 1 can be gradually thinned toward the proximal side to facilitate the implantation of the plate body 1. The proximal and distal edges of the plate body 1 can be designed with smooth transitions to prevent damage to soft tissues and unnecessary scratches.
[0043] The above is a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.
Claims
1. A distal femoral lateral locking bone plate with medial column support, characterized in that: It comprises a plate body, wherein: The plate body is designed in an anatomical shape as a whole; The proximal end of the plate body is provided with a first nail hole for accommodating a first bone screw, and the distal end of the plate body is used to be placed at the femoral condyle and is provided with a second nail hole for accommodating a second bone screw; The middle portion of the plate body is used to be placed at the upper portion of the femoral condyle and is provided with a pair of third nail holes for accommodating a third bone screw, wherein the pair of third nail holes are respectively located on both sides of a center line in the length direction of the plate body, and the pair of third nail holes are inclined at a certain angle so that the third bone screw can be screwed through the medial condyle cortex to the opposite side and does not intersect with the second bone screw in the second nail hole, thereby forming a triangular fixation.
2. The distal lateral femoral locking bone plate with medial column support according to claim 1, characterized in that: The pair of third nail holes are arranged at intervals along the length direction of the plate body.
3. The distal lateral femoral locking bone plate with medial column support according to claim 2, characterized in that: The distance between the pair of third nail holes is 0.8-2 cm.
4. The distal lateral femoral locking bone plate with medial column support according to claim 1, characterized in that: The angle between the axis of the third bone screws in the pair of third nail holes and the plane where the plate body is located is 30-60 degrees.
5. The distal lateral femoral locking bone plate with medial column support according to claim 1, characterized in that: The first screw hole is a locking screw / cortical bone screw mixed screw hole; And / or, the number of the first nail holes is at least two and they are arranged at intervals along the length direction of the plate body.
6. The distal lateral femoral locking bone plate with medial column support according to claim 1, characterized in that: The number of the second nail holes is at least two and they are arranged at intervals.
7. The distal lateral femoral locking bone plate with medial column support according to claim 6, characterized in that: The number of the second nail holes is seven, three of which are arranged at intervals along the length direction of the plate body, and the other four nail holes are divided into two pairs of nail holes along the width direction of the plate body, and the two pairs of nail holes are arranged at intervals between the three nail holes.
8. The distal lateral femoral locking bone plate with medial column support according to claim 6, characterized in that: The second nail hole is a locking screw hole; And / or, an instrument positioning hole is provided between the second nail holes.
9. The distal lateral femoral locking bone plate with medial column support according to claim 6, characterized in that: The angle between the axis of the second bone screw in the second nail hole and the plane where the plate body is located is 70-110 degrees.
10. The distal lateral femoral locking bone plate with medial column support according to claim 1, characterized in that: The proximal end of the plate body gradually becomes thinner toward the proximal side; And / or, the proximal and distal edges of the plate body are both designed with smooth transition.