Hoffa Anatomical Plate

Abstract

The present invention belongs to the technical field of anatomical steel plates, and discloses a Hoffa anatomical steel plate, wherein the lower end of the femoral stem is integrally provided with a condylar wing, and the outer side of the femoral stem is integrally provided with a posterior condylar blocking wing; a plurality of locking screw holes are provided on the femoral stem, the condylar wing and the posterior condylar blocking wing. The femoral stem and the condylar wing are arc-shaped. The direction of the locking screw hole on the femoral stem is perpendicular to the axis of the femoral shaft, the locking screw hole on the posterior condylar blocking wing is inclined at a certain angle to the wing surface, the outer row of locking screw holes on the condylar wing is perpendicular to the sagittal plane of the condyle, and the inner row of locking screw holes is at a certain angle to the sagittal plane of the condyle. The condylar blocking wing of the present invention resists the shear force to the rear and upward, and the femoral stem and the condylar wing gather the broken femoral condyle into a whole for support and fixation, and when fixed, the front end of the condylar wing exceeds the fracture surface by at least 2 screw holes. It can reliably reduce and fix Hoffa fractures without damaging the articular surface and prevent possible fracture re-displacement.

Description

Technical Field

[0001] The invention belongs to the technical field of anatomical steel plates, and in particular relates to a Hoffa anatomical steel plate. Background Art

[0002] At present, the coronal intra-articular fracture of the posterior femoral condyle (unilateral or bilateral) was first described by Hoffa in 1904, so it is called Hoffa fracture. Hoffa fractures are mostly high-energy injuries and are more common in young and middle-aged people. The injury mechanism is mostly caused by axial shear force acting on the posterior part of the femoral condyle when the knee joint is semi-flexed. The current fixation method of Hoffa fracture is mostly screw fixation through the articular cartilage. This fixation method has the disadvantage of damaging the cartilage surface and the surgical trauma is large. After fixation, the fracture fragments will still be subjected to posterior and upward shear forces under the action of the tibial plateau when the knee joint moves, which can easily cause the fracture fragments to shift posteriorly and superiorly, resulting in fixation failure, which is especially prone to occur when combined with osteoporosis.

[0003] In order to solve this problem, it is necessary to develop a new type of internal fixation plate to reduce and fix Hoffa fractures without damaging the articular cartilage.

[0004] Through the above analysis, the problems and defects of the existing technology are as follows: the existing treatment methods for Hoffa fractures have large surgical trauma and cause iatrogenic damage to the articular cartilage. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a Hoffa anatomical steel plate.

[0006] The present invention is achieved in that a Hoffa anatomical steel plate is provided with:

[0007] Femoral stem;

[0008] The lower end of the femoral stem is integrally provided with a condylar wing, and the outer side of the femoral stem is integrally provided with a posterior condylar blocking wing; a plurality of locking screw holes are provided on the femoral stem, the condylar wing and the posterior condylar blocking wing.

[0009] Furthermore, the femoral stem and the side wings of the condyle are arc-shaped.

[0010] Furthermore, the direction of the locking screw hole on the femoral stem is perpendicular to the axis of the femoral shaft, the locking screw hole on the posterior condylar blocking wing is inclined at a certain angle to the wing surface, the outer row of locking screw holes on the side wing of the condyle are perpendicular to the sagittal plane of the condyle, and the inner row of locking screw holes is inclined at a certain angle to the sagittal plane of the condyle.

[0011] Another object of the present invention is to provide a control method of the Hoffa anatomical plate, which comprises: performing fracture reduction and temporary fixation with Kirschner wires from two windows at the front and rear edges of the biceps femoris, implanting the Hoffa plate from the posterolateral side, passing the condylar wing from under the lateral collateral ligament to the anterior condyle, inserting the femoral stem, the posterior condylar blocking wing and the posterior screws of the condylar wing into the posterior window of the biceps femoris, and inserting the anterior screws of the condylar wing into the anterior window of the biceps femoris, and obtaining the fracture stability of the knee joint for examination;

[0012] The condylar blocking wing resists the posterior and upward shear force, and the femoral stem and condylar wing gather the broken femoral condyle into a whole for support and fixation. During fixation, the front end of the condylar wing exceeds the fracture surface by at least screw holes.

[0013] Combining all the above-mentioned technical solutions, the advantages and positive effects of the present invention are as follows: the condylar blocking wing of the present invention resists the posterior and upward shear force, and the femoral stem and the condylar wing gather the broken femoral condyle into a whole for support and fixation. When fixed, the front end of the condylar wing exceeds the fracture surface by at least 2 screw holes. Hoffa fractures can be reliably reduced and fixed without damaging the articular surface, and possible re-displacement of the fracture can be prevented. The present invention provides a special internal fixation steel plate for treating Hoffa fractures, which can reliably support and fix various types of Hoffa fractures without damaging the articular surface cartilage during surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 is a schematic structural diagram of a femoral stem provided by an embodiment of the present invention;

[0016] Figure 2 It is a schematic structural diagram of a femoral stem and a condylar flank provided by an embodiment of the present invention;

[0017] Figure 3 It is a schematic structural diagram of a posterior condylar blocking wing and a locking screw hole provided by an embodiment of the present invention;

[0018] In the figure: 1. Femoral stem; 2. Condylar wing; 3. Posterior condylar blocking wing; 4. Locking screw hole. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] In view of the problems existing in the prior art, the present invention provides a Hoffa anatomical steel plate, which will be described in detail below in conjunction with the accompanying drawings.

[0021] like Figures 1 to 3 As shown, the Hoffa anatomical steel plate provided by the present invention includes: a femoral stem 1, a condylar lateral wing 2, a posterior condylar blocking wing 3, and a locking screw hole 4.

[0022] In this embodiment, the lower end of the femoral stem 1 is integrated with a condylar wing 2, and the outer side of the femoral stem 1 is integrated with a posterior condylar blocking wing 3; a plurality of locking screw holes 4 are provided on the femoral stem 1, the condylar wing 2 and the posterior condylar blocking wing 3.

[0023] In this embodiment, the femoral stem 1 and the condylar flank 2 are arc-shaped.

[0024] In this embodiment, the Hoffa anatomical steel plate is designed strictly according to the anatomical shape of the posterior and lateral surfaces of the femoral condyle, and is fixed with locking screws of corresponding specifications. A plurality of locking screw holes are distributed throughout the plate, wherein the locking screw hole 4 on the femoral stem 1 is perpendicular to the axis of the femoral shaft, the locking screw hole 4 on the posterior condylar blocking wing 3 is inclined at a certain angle to the wing surface, the outer row of locking screw holes 4 on the condylar lateral wing 2 is perpendicular to the sagittal plane of the condyle, and the inner row of locking screw holes 4 is at a certain angle to the sagittal plane of the condyle.

[0025] The working principle of the present invention is as follows: take the healthy side lying position, the affected side knee joint posterolateral approach, make a skin incision on the line connecting the rear of Gerdy's tubercle and the rear edge of the femoral lateral condyle, enter the posterolateral joint cavity deeply in the gap between the iliotibial band and the biceps femoris tendon, pay attention to protecting the common peroneal nerve, perform fracture reduction and temporary fixation with Kirschner wires from the two windows at the front and rear edges of the biceps femoris, implant a Hoffa steel plate from the posterolateral side, the condylar wing 2 passes from under the lateral collateral ligament to the anterior condyle, insert a femoral stem 1, a posterior condylar blocking wing 3 and a posterior screw of the condylar wing 2 into the rear window of the biceps femoris, insert a front screw of the condylar wing 2 into the front window of the biceps femoris, obtain the stability of the fracture of the knee joint, rinse the incision, and close the incision layer by layer. No external fixation is required after surgery, which is conducive to rapid rehabilitation activities.

[0026] After the operation, the condylar blocking wing resists the shear force to the back and up, and the femoral stem 1 and the condylar wing 2 gather the broken femoral condyle into a whole for support and fixation. When fixation is performed, the front end of the condylar wing 2 exceeds the fracture surface by at least 2 screw holes. The Hoffa fracture can be reliably reduced and fixed without damaging the articular surface, and possible re-displacement of the fracture can be prevented.

[0027] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A Hoffa anatomical plate, characterized in that: The Hoffa anatomical plate is provided with: Femoral stem; The lower end of the femoral stem is integrally provided with a condylar wing, and the outer side of the femoral stem is integrally provided with a posterior condylar blocking wing; a plurality of locking screw holes are provided on the femoral stem, the condylar wing and the posterior condylar blocking wing; the femoral stem and the condylar wing are arc-shaped; The locking screw holes on the femoral stem are perpendicular to the femoral axis, the locking screw holes on the posterior condylar blocking wing are inclined at a certain angle to the wing surface, the outer row of locking screw holes on the condylar lateral wing are perpendicular to the condylar sagittal plane, and the inner row of locking screw holes are at a certain angle to the condylar sagittal plane.

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