Knee joint postoperative flexion and extension movement auxiliary device

Abstract

The utility model provides a knee joint postoperative flexion and extension movement auxiliary device, and belongs to the technical field of medical treatment. The device mainly comprises a bottom plate, a clamping block is installed at one end of the lower end face of the bottom plate, a clamping opening is formed in the clamping block, the bottom plate is connected to a bed tail in a clamped mode through the clamping opening of the clamping block, a fixing hole is formed in the clamping block and communicated with the clamping opening, a first stud is connected into the fixing hole in a threaded mode, and a second stud is connected into the first stud in a threaded mode. The end part of the first stud is propped against the lower end surface of the bed plate in the bayonet; a vertical rod is vertically installed on the upper end face of the bottom plate, the vertical rod is installed at the end close to the clamping block, a pulley is rotationally connected to the vertical rod, the rotating axis of the pulley coincides with the axis of the vertical rod, two limiting blocks are installed on the vertical rod, and the pulley is installed on the portion, between the two limiting blocks, of the vertical rod; and a flexion and extension auxiliary structure is mounted on the upper end surface of the bottom plate. According to the utility model, the strength can be adjusted by a user to assist the user in completing flexion and extension of knees.

Description

Technical Field

[0001] This utility model relates to the field of medical technology, and in particular to an assistive device for flexion and extension movements after knee joint surgery. Background Technology

[0002] Patients who have undergone knee replacement surgery need to perform leg extension and flexion exercises during rehabilitation, with a focus on flexion and extension. Patients need to reach a certain intensity of flexion and extension exercises to meet discharge criteria. Clinically, manual passive flexion and extension rehabilitation methods are used, where someone manually assists the patient in flexing their knee. However, the force is difficult to control, and it can easily injure the patient. Patients often find it difficult to flex their knees themselves without assistance. Knee extension is typically achieved by placing weights such as sandbags on the knee joint for passive extension training. However, this method is not ideal in clinical practice. For example, the sandbags can easily press against the surgical incision area or even the incision itself, often causing pain at the incision site. Patients may also frequently move their knees due to pain, causing the sandbags to fall off, thus failing to achieve the desired functional rehabilitation effect.

[0003] Therefore, there is a need to design a device that can assist patients in flexing and straightening their knees independently, with adjustable force to prevent injury. Utility Model Content

[0004] To address the aforementioned problems, the purpose of this invention is to provide a postoperative knee flexion and extension exercise assistive device that allows users to adjust the force to assist in completing knee flexion and extension movements.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A knee joint postoperative flexion and extension movement assistive device mainly includes a base plate. A locking block is installed at one end of the lower end face of the base plate. The locking block has a locking slot. The base plate is locked to the foot of the bed through the locking slot of the locking block. A fixing hole is opened on the locking block. The fixing hole communicates with the locking slot. A first stud is threaded into the fixing hole. The end of the first stud abuts against the lower end face of the bed plate in the locking slot. A vertical rod is vertically installed on the upper end face of the base plate. The vertical rod is installed at one end near the locking block. A pulley is rotatably connected to the vertical rod. The rotation axis of the pulley coincides with the axis of the vertical rod. Two limiting blocks are installed on the vertical rod. The pulley is installed on the vertical rod between the two limiting blocks.

[0007] The upper surface of the base plate is equipped with a flexion-extension auxiliary structure, which mainly includes two moving blocks, namely a left moving block and a right moving block. Both moving blocks are installed on the upper surface of the base plate. Each moving block has a sliding groove, the length direction of which is parallel to the length direction of the base plate. Each sliding groove is slidably connected to a footrest, which is divided into a left footrest and a right footrest. Each footrest consists of a support plate and a foot plate. The lower surface of the support plate is equipped with a slider, which slides in the sliding groove. The internal dimension of the sliding groove is larger than the opening dimension of the groove, and the slider does not detach from the sliding groove. The upper surface of the support plate is vertically equipped with a foot plate. The front of the foot plate of both footrests is equipped with a fixing strap for fixing the foot. The back of the foot plate of both footrests is connected to one end of a traction rope, which is wound around a pulley. Each footrest is connected to a pull rope.

[0008] Furthermore, the movable block is detachably connected to the base plate. The base plate has two elongated plate holes, the length of which is parallel to the width of the base plate. Both ends of the bottom surface of the slide groove have elongated sliding holes, the length of which is parallel to the length of the slide groove. A second stud is connected to the plate hole and the sliding hole. A retaining plate is provided on the outer ring of one end of the second stud. The second stud passes through the plate hole and the sliding hole in sequence. The retaining plate abuts against the lower end face of the base plate. A fastening nut is threaded onto the second stud. The lower end face of the fastening nut abuts against the bottom surface of the slide groove. The lower end face of the slider is higher than the upper end face of the second stud and the fastening nut.

[0009] Furthermore, a resistance adjustment structure is installed inside the moving block. The resistance adjustment structure mainly includes a resistance plate, which is placed in the slide groove of the moving block and located below the slider. Each resistance plate is vertically mounted with a third stud. Two third studs are respectively installed at both ends of the upper end face of the resistance plate along the length direction. Two adjustment holes are opened on the moving block, and the two adjustment holes communicate with the slide groove. The third studs extend out of the slide groove from the adjustment holes. An adjustment nut is threaded onto the third stud. The lower end face of the adjustment nut abuts against the upper end face of the moving block, and the upper end face of the resistance plate abuts against the lower end face of the slider.

[0010] Furthermore, the upper surface of the resistance plate is covered with an anti-wear layer.

[0011] Furthermore, a support structure for supporting the knee is installed on the base plate.

[0012] Furthermore, the upper surface of the support pad is provided with a soft pad layer.

[0013] Furthermore, the support structure mainly includes a support pad and a connecting rod. The base plate has multiple elongated connecting holes, the length direction of which is parallel to the length direction of the base plate. The lower end face of the support pad has multiple pad holes, and one end of the connecting rod is connected to each pad hole. The other end of the connecting rod is provided with a retaining plate. The connecting rod passes through the connecting hole, and the retaining plate of the connecting rod abuts against the lower end face of the base plate. A connecting nut is threaded onto the connecting rod, and the lower end face of the connecting nut abuts against the upper end face of the base plate.

[0014] Furthermore, the connecting rod is a lifting rod.

[0015] Furthermore, a limiting rod is installed between the two limiting blocks, the axis of the limiting rod is parallel to the axis of the pulley, and the traction rope is located between the limiting rod and the pulley.

[0016] Furthermore, the upper surface of the tray is provided with a soft pad.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When starting training, a pull rope is needed to assist in leg flexion and extension movements. The patient's two feet are fixed to the footrests of this invention. When the pull rope on the left footrest is used, it moves the left foot forward within the groove of the left moving block, causing the left knee to flex. Simultaneously, the forward-moving left footrest, via the traction rope, moves the right foot backward within the groove of the right moving block, causing the right leg to straighten. Similarly, using the pull rope on the right footrest, it moves the right foot forward, causing the right knee to flex and the left leg to straighten. This alternating movement of the left and right footrests assists the patient in performing leg flexion and extension movements. The force of pulling the pull rope is controlled by the patient, minimizing the risk of injury.

[0019] 2. The positions of the left and right moving blocks in this invention can be adjusted via the holes on the base plate and the sliding holes at the bottom of the sliding grooves of the moving blocks. This adjustment allows for adaptation to the degree of leg opening of the patient, expanding the applicability and improving comfort. By adjusting the placement of the two moving blocks, the distance and angle between them can be adjusted. After adjustment, the moving blocks are fixed to the base plate using the second stud and the fastening nut.

[0020] 3. Once the patient has recovered to a certain extent, the ropes are no longer used to assist in leg flexion and extension movements. The patient can complete these movements using their own leg strength. At this point, the resistance adjustment structure of this invention can be used to adjust the resistance experienced by the left and right supports within the moving block. This adjustment is based on the intensity of the patient's activity during flexion and extension movements, thus better assisting rehabilitation training and improving training effectiveness.

[0021] 4. Because the patient's foot is placed on the footrest at a certain height, when the patient's leg is straightened, the knee will be unsupported, preventing the knee from getting proper rest. This invention features a support structure with adjustable height. When the patient's knee is extended, the popliteal fossa can rest on the support pad of the support structure, improving knee comfort. Furthermore, the position of the support structure can be adjusted according to the patient's leg length, increasing its applicability. Attached Figure Description

[0022] Figure 1 This is a rendering of the device installed on a bed according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the overall structure provided in the embodiment of this utility model.

[0024] Figure 3 This is a left view of the overall structure provided in this embodiment of the utility model.

[0025] Figure 4 This is a top view of the overall structure provided in the embodiment of this utility model.

[0026] Figure 5 This is a schematic diagram of the movable block after its position has been adjusted, provided in an embodiment of this utility model.

[0027] Among them, 1 is the bed, 2 is the locking block, 3 is the first stud, 4 is the vertical rod, 5 is the pulley, 6 is the limiting rod, 7 is the limiting block, 8 is the base plate, 9 is the traction rope, 10 is the foot plate, 11 is the support plate, 12 is the pull rope, 13 is the support pad, 14 is the connecting hole, 15 is the moving block, 16 is the sliding groove, 17 is the plate hole, 18 is the fixing belt, 19 is the connecting rod, 20 is the connecting nut, 21 is the second stud, 22 is the fastening nut, and 23 is the sliding hole. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The accompanying drawings are for illustrative purposes only and represent schematic diagrams, not actual pictures. They should not be construed as limiting the present patent. In order to better illustrate the specific implementation of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures, components, and their descriptions may be omitted in the drawings. The terms "upper," "lower," "left," and "right" are used to illustrate the invention and do not represent the actual product's location. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0030] A specific embodiment, as shown in the figure, represents a preferred embodiment of this utility model. A postoperative knee joint flexion and extension movement assistive device mainly includes a base plate 8. A locking block 2 is installed at one end of the lower end face of the base plate 8. The locking block 2 has a locking slot, and the base plate 8 is locked to the end of a bed 1 through the locking slot of the locking block 2. A fixing hole is provided on the locking block 2, and the fixing hole communicates with the locking slot. A first stud 3 is threaded into the fixing hole, and the end of the first stud 3 abuts against the lower end face of the bed 1 within the locking slot. A vertical rod 4 is vertically installed on the upper end face of the base plate 8. The vertical rod 4 is installed at one end near the locking block 2, and a pulley 5 is rotatably connected to the vertical rod 4. The rotation axis of the pulley 5 coincides with the axis of the vertical rod 4. Two limiting blocks 7 are installed on the vertical rod 4, and the pulley 5 is installed on the vertical rod 4 between the two limiting blocks 7.

[0031] A flexion-extension auxiliary structure is installed on the upper surface of the base plate 8. The flexion-extension auxiliary structure mainly includes two moving blocks 15, namely a left moving block and a right moving block. Both moving blocks 15 are installed on the upper surface of the base plate 8. Each moving block 15 has a sliding groove 16. The length direction of the sliding groove 16 is parallel to the length direction of the base plate 8. A foot support is slidably connected to each sliding groove 16. The foot support is divided into a left support and a right support. The foot support is composed of a support plate 11 and a foot plate 10. A slider is installed on the lower end face of the support plate 11. The slider slides in the groove 16. The internal dimension of the groove 16 is larger than the size of the groove opening of the groove 16. The slider does not detach from the groove 16. A foot plate 10 is vertically installed on the upper end face of the support plate 11. A fixing strap 18 for fixing the feet is installed on the front of the foot plate 10 of both foot plates. One end of the traction rope 9 is connected to the back of the foot plate 10 of both foot plates. The traction rope 9 is wound around the pulley 5. A pull rope 12 is connected to each foot plate.

[0032] In its specific implementation, this utility model first installs the base plate 8 at the end of the bed 1. After being engaged with the end of the bed 1 by the latching block 2, a first stud 3 is threaded into the fixing hole, so that the end of the first stud 3 abuts against the lower end surface of the bed 1 plate within the latching hole, thereby fixing the latching block 2 onto the bed 1 plate and thus fixing the position of the base plate 8. Furthermore, to facilitate rotation of the first stud 3, a handle for rotation is installed at the other end of the first stud 3, allowing for quick and easy rotation to fix the position of the base plate 8. The flexion-extension assist structure installed on the upper surface of the base plate 8 is used to assist the patient in alternating flexion and extension movements of the knees, assisting the patient in completing rehabilitation training.

[0033] When patients begin initial training, their leg strength is insufficient, requiring the use of a pull rope 12 to assist leg movements. The patient's left foot is placed on the support plate 11 of the left support, and secured to the foot plate 10 using the fixing strap 18 on the left support footboard 10, thus securing the patient's left foot to the left support. Similarly, the patient's right foot is secured to the right support. The backs of the foot plates 10 of the left and right supports are respectively connected to one end of a traction rope 9, which is wound around the pulley 5 of the vertical rod 4. The left support can slide within the groove 16 of the left moving block, and the right support can slide within the groove 16 of the right moving block. Because both the left and right supports slide within the groove 16 of the moving block 15 via sliders, to prevent them from detaching from the moving block 15 during sliding, the groove 16 is designed with an internal dimension larger than the opening dimension of the groove 16, ensuring the slider is trapped within the groove 16 and cannot detach from the smaller opening. When the left support is pulled forward using the left support rope 12, the left foot on the left support moves forward accordingly, causing the left leg to flex at the knee. Because traction ropes 9 are connected to the footplates 10 of both the left and right supports, and because these traction ropes 9 are wound around the pulley 5, when the left support moves forward, the traction rope 9 causes the right support to move backward, causing the right leg to straighten. Furthermore, since the pulley 5 can rotate on the vertical rod 4, the traction rope 9 drives the pulley 5 to roll, reducing the resistance experienced by the traction rope 9 on the pulley 5, making it easier and reducing wear on the traction rope 9. Because the force required to pull the rope 12 is controlled by the patient, it is less likely to cause injury.

[0034] Once the patient has recovered to a certain extent, their leg strength will return, and they can stop using the rope 12 to assist in leg flexion and extension movements. Instead, they can use their own leg strength to complete the knee flexion and extension movements. The difficulty of the flexion and extension movements needs to be adjusted according to the patient's recovery level. Therefore, a resistance adjustment structure is further installed within the moving block 15. This structure mainly includes a resistance plate, which is placed within the slide groove 16 of the moving block 15. The resistance plate is located below the slider, and each resistance plate is vertically mounted with a third stud. Two third studs are respectively installed at opposite ends of the upper surface of the resistance plate along its length. The moving block 15 has two adjustment holes that communicate with the slide groove 16. The third studs extend beyond the slide groove 16 from the adjustment holes, and an adjustment nut is threaded onto each third stud. The lower end of the adjustment nut abuts against the upper surface of the moving block 15, and the upper end of the resistance plate abuts against the lower end of the slider. The height of the resistance plate within the slide groove 16 is adjustable by adjusting the threaded connection between the adjusting nut and the third stud. The resistance plate abuts against the lower end face of the slider, clamping the slider onto the slide groove 16. The clamping force can be adjusted by adjusting the adjusting nut to change the resistance experienced by the slider. As the slider slides, it needs to overcome the resistance of the resistance plate, thus adjusting the leg strength required for the left and right supports to slide, improving the effectiveness of rehabilitation training. Furthermore, the upper end face of the resistance plate is covered with an anti-wear layer to prevent wear and increase the resistance experienced by the slider.

[0035] Because each patient's body shape is different, the position of their legs will vary when they are in a comfortable state. Therefore, the movable block 15 is detachably connected to the base plate 8. The base plate 8 has two elongated plate holes 17, the length of which is parallel to the width of the base plate 8. The bottom surface of the slide groove 16 has elongated sliding holes 23 at both ends, the length of which is parallel to the length of the slide groove 16. A second stud 21 is connected to the plate hole 17 and the sliding hole 23. A retaining plate is provided on the outer ring of one end of the second stud 21. The second stud 21 passes through the plate hole 17 and the sliding hole 23 in sequence. The retaining plate abuts against the lower end face of the base plate 8. A fastening nut 22 is threaded onto the second stud 21. The lower end face of the fastening nut 22 abuts against the bottom surface of the slide groove 16. The lower end face of the slider is higher than the upper end face of the second stud 21 and the fastening nut 22. The moving block 15 is fixed to the base plate 8 by the clamping of the second stud 21 and the fastening nut 22. Before using this utility model, the fastening nut 22 can be loosened so that the moving block 15 is no longer fixed to the base plate 8, allowing the second stud 21 to move within the plate hole 17 and the sliding hole 23. Then, the distance and angle between the left and right moving blocks can be adjusted so that the patient is more comfortable when placing both feet on the footrest of the moving block 15. After the position of the moving block 15 is adjusted, the fastening nut 22 on the second stud 21 is tightened so that the moving block 15 is fixed to the base plate 8 again.

[0036] Because the patient's feet are fixed to the left and right supports, which are at a certain height, the patient's knees are off-center when the legs are straight, preventing them from resting properly. Therefore, a support structure for supporting the knees is further installed on the base plate 8. This support structure supports the patient's knees in the popliteal fossa, allowing the knees to rest comfortably when extended. Since different patients have different leg lengths and knee positions, this design aims to broaden the applicability of this invention. Furthermore, the support structure mainly includes a support pad 13 and a connecting rod 19. The base plate 8 has multiple elongated connecting holes 14, the length of which is parallel to the length of the base plate 8. The lower end face of the support pad 13 has multiple pad holes, each of which connects one end of the connecting rod 19. The other end of the connecting rod 19 is fitted with a retaining plate. The connecting rod 19 passes through the connecting hole 14, and the retaining plate of the connecting rod 19 abuts against the lower end face of the base plate 8. A connecting nut 20 is threaded onto the connecting rod 19, and the lower end face of the connecting nut 20 abuts against the upper end face of the base plate 8. Before using the support structure, loosen the connecting nut 20 so that the connecting rod 19 is no longer fixed to the base plate 8. Adjust the position of the connecting rod 19 in the connecting hole 14 on the base plate 8 according to the patient's knee popliteal fossa position. After adjustment, tighten the connecting nut 20 to fix the connecting rod 19 back to the base plate 8, thereby fixing the position of the support structure. If the support structure is not needed, the support pad 13 and connecting rod 19 can be separated and removed. Furthermore, the upper surface of the support pad 13 is provided with a soft padding layer, which allows the knee's popliteal fossa to rest against, improving comfort. Furthermore, the connecting rod 19 is a lifting rod, allowing adjustment of the support structure's height so that it does not interfere with the patient's knee flexion movements. When the knee is extended, the patient can rest against the support structure when feeling tired.

[0037] Because the two ends of the traction rope 9 are connected to the left and right supports respectively, when the patient's legs are straightened simultaneously, the traction rope 9 is no longer taut, causing it to detach from the pulley 5. When performing knee flexion and extension movements, the traction rope 9 needs to be rewound onto the pulley 5, which is inconvenient. Therefore, a limiting rod 6 is further installed between the two limiting blocks 7, with the axis of the limiting rod 6 parallel to the axis of the pulley 5. The traction rope 9 is located between the limiting rod 6 and the pulley 5. The limiting rod 6 confines the traction rope 9 within the pulley 5, facilitating use.

[0038] Furthermore, the upper surface of the footrest 11 is provided with a soft pad. When the patient's feet are placed on the footrest 11, the heels rest on the footrest 11, and the heels are prone to chafing during flexion and extension movements. The soft pad can improve comfort.

[0039] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A knee joint postoperative flexion and extension movement assistive device, characterized in that: The system mainly includes a base plate, with a locking block installed at one end of the lower surface of the base plate. The locking block has a locking slot, and the base plate is locked to the foot of the bed through the locking slot. The locking block has a fixing hole that communicates with the locking slot. A first stud is threaded into the fixing hole, and the end of the first stud abuts against the lower surface of the bed plate inside the locking slot. A vertical rod is vertically installed on the upper surface of the base plate. The vertical rod is installed at one end near the locking block, and a pulley is rotatably connected to the vertical rod. The rotation axis of the pulley coincides with the axis of the vertical rod. Two limiting blocks are installed on the vertical rod, and the pulley is installed on the vertical rod between the two limiting blocks. The upper surface of the base plate is equipped with a flexion-extension auxiliary structure, which mainly includes two moving blocks, namely a left moving block and a right moving block. Both moving blocks are installed on the upper surface of the base plate. Each moving block has a sliding groove, the length direction of which is parallel to the length direction of the base plate. Each sliding groove is slidably connected to a footrest, which is divided into a left footrest and a right footrest. Each footrest consists of a support plate and a foot plate. The lower surface of the support plate is equipped with a slider, which slides in the sliding groove. The internal dimension of the sliding groove is larger than the opening dimension of the groove, and the slider does not detach from the sliding groove. The upper surface of the support plate is vertically equipped with a foot plate. The front of the foot plate of both footrests is equipped with a fixing strap for fixing the foot. The back of the foot plate of both footrests is connected to one end of a traction rope, which is wound around a pulley. Each footrest is connected to a pull rope.

2. The knee joint postoperative flexion and extension movement assistive device as described in claim 1, characterized in that: The movable block is detachably connected to the base plate. The base plate has two elongated plate holes, the length of which is parallel to the width of the base plate. The bottom surface of the slide groove has elongated sliding holes at both ends, the length of which is parallel to the length of the slide groove. A second stud is connected to the plate hole and the sliding hole. A retaining plate is provided on the outer ring of one end of the second stud. The second stud passes through the plate hole and the sliding hole in sequence. The retaining plate abuts against the lower end face of the base plate. A fastening nut is threaded onto the second stud. The lower end face of the fastening nut abuts against the bottom surface of the slide groove. The lower end face of the slider is higher than the upper end face of the second stud and the fastening nut.

3. The knee joint postoperative flexion and extension movement assistive device as described in claim 1, characterized in that: The moving block is equipped with a resistance adjustment structure, which mainly includes a resistance plate. The resistance plate is placed in the slide groove of the moving block and is located below the slider. Each resistance plate is vertically mounted with a third stud. Two third studs are respectively installed at both ends of the upper end face of the resistance plate along the length direction. The moving block has two adjustment holes that communicate with the slide groove. The third studs extend out of the slide groove from the adjustment holes. An adjustment nut is threaded onto the third stud. The lower end face of the adjustment nut abuts against the upper end face of the moving block. The upper end face of the resistance plate abuts against the lower end face of the slider.

4. The knee joint postoperative flexion and extension movement assistive device as described in claim 3, characterized in that: The upper surface of the resistance plate is covered with an anti-wear layer.

5. The knee joint postoperative flexion and extension movement assistive device as described in claim 1, characterized in that: The base plate is equipped with a support structure for supporting the knees.

6. The knee joint postoperative flexion and extension movement assistive device as described in claim 5, characterized in that: The support structure mainly includes a support pad and a connecting rod. The base plate has multiple elongated connecting holes, the length of which is parallel to the length of the base plate. The lower end face of the support pad has multiple pad holes, and one end of the connecting rod is connected to each pad hole. The other end of the connecting rod is fitted with a retaining plate. The connecting rod passes through the connecting hole, and the retaining plate of the connecting rod abuts against the lower end face of the base plate. A connecting nut is threaded onto the connecting rod, and the lower end face of the connecting nut abuts against the upper end face of the base plate.

7. The knee joint postoperative flexion and extension movement assistive device as described in claim 6, characterized in that: The upper surface of the support pad is provided with a soft pad layer.

8. The knee joint postoperative flexion and extension movement assistive device as described in claim 7, characterized in that: The connecting rod is a lifting rod.

9. The knee joint postoperative flexion and extension movement assistive device as described in claim 1, characterized in that: A limiting rod is installed between the two limiting blocks, the axis of the limiting rod is parallel to the axis of the pulley, and the traction rope is located between the limiting rod and the pulley.

10. The knee joint postoperative flexion and extension movement assistive device as described in claim 1, characterized in that: The upper surface of the tray is provided with a soft pad.

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