System and method for measuring angle for rehabilitation exercise of knee

Abstract

The present invention relates to a knee angle measuring device and method for knee rehabilitation exercises. According to the present invention, in order to solve the problems of conventional knee rehabilitation exercise devices and methods, which had limitations in that a device or method capable of easily measuring the knee angle for rehabilitation exercises after knee surgery was not provided, the device is configured in the form of a wearable knee angle measuring device that enables safe measurement by designing the strap position so as not to come into contact with the surgical site when worn. Furthermore, the device is configured to be linked in real-time with a digital therapeutic agent and a dedicated application program for knee rehabilitation exercises, allowing the operation of the device and verification of measurement results through the app. This enables patients requiring rehabilitation exercises to measure the knee joint angle more conveniently and easily even with stitches present immediately after knee surgery, thereby further enhancing the effectiveness and efficiency of the rehabilitation exercises. A knee angle measuring system and method for knee rehabilitation exercises are provided.

Description

Technology Field

[0001] The present invention relates to a device and method for measuring the knee angle for knee rehabilitation exercises. More specifically, it relates to a knee angle measurement system and method for knee rehabilitation exercises configured in the form of a wearable knee angle measuring tool to enable more convenient and easy measurement of the knee joint angle even with stitches present after knee surgery, in order to solve the problems of conventional knee rehabilitation exercise devices and methods, which had limitations in that they failed to provide a device or method capable of easily measuring the knee angle for rehabilitation exercises after knee surgery. This is because, for example, knee rehabilitation exercises to restore knee angle and muscle strength during the recovery period due to accidents or diseases, such as artificial joint surgery, are essential for this purpose, and it is desirable to provide appropriate rehabilitation exercises to the patient by wearing rehabilitation equipment and checking the knee angle.

[0003] Furthermore, the present invention relates to a knee angle measurement system and method for knee rehabilitation exercises, configured to solve the problems of conventional knee rehabilitation exercise devices and methods, which had limitations in that they did not provide a device or method capable of easily measuring the knee angle for rehabilitation exercises after knee surgery as described above. The device is configured in the form of a wearable knee angle measuring device that enables safe measurement by designing the strap position so as not to come into contact with the surgical site when worn. It is configured to be linked in real-time with a digital therapeutic agent and a dedicated application program for knee rehabilitation exercises, allowing the device's operation to be controlled and measurement results to be verified through the app. This enables patients requiring rehabilitation exercises to measure the knee joint angle more conveniently and easily, even while sutures are still in place immediately after knee surgery, thereby further enhancing the effectiveness and efficiency of the rehabilitation exercises. Background Technology

[0005] Conventionally, generally, after treating a joint damaged by various accidents or diseases, such as through artificial joint surgery or arthroscopy, rehabilitation exercises must be performed during the recovery period to improve the range of motion of the affected joint and prevent stiffness.

[0007] In addition, conventionally, Continuous Passive Motion (CPM) devices are widely used as rehabilitation exercise therapy devices to assist with joint movement for rehabilitation exercises following joint surgery, such as knee surgery.

[0009] In other words, these existing CPM devices are configured to perform exercises that improve the range of motion of the knee joint and strengthen the muscles around the joint after knee surgery, such as artificial joint replacement, and have the advantage of being able to automatically perform knee exercises.

[0011] However, since forcing patients immediately after surgery to perform reciprocating exercises of bending and straightening the knee can lead to severe knee pain, it is advisable for patients to perform appropriate exercises on their own according to their condition.

[0013] To this end, various devices and methods have been presented in the past to enable knee rehabilitation exercises to be performed more easily and effectively, for example, as described in the "knee joint guide device" of Korean Published Patent Application No. 10-2023-0030964; however, the contents of the prior art described above had the following limitations.

[0015] More specifically, for effective knee rehabilitation, it is desirable to wear rehabilitation equipment on the patient's leg and determine the knee angle suitable for the patient to provide appropriate rehabilitation exercises; however, the aforementioned conventional technologies had a limitation in that they did not provide a device or method to safely and easily measure the knee angle for rehabilitation exercises after knee surgery.

[0017] In other words, for example, appropriate knee rehabilitation exercises are necessary to restore knee angle and muscle strength during the recovery period following knee surgery, particularly in cases such as artificial joint replacement; to achieve this, the range of motion of the knee must be accurately measured.

[0019] Here, for example, it is desirable to measure the angle immediately after surgery without contacting or interfering with the wound site, such as when sutures remain after knee surgery; however, the aforementioned prior art had a limitation in that it did not consider a device or method that would allow patients requiring rehabilitation exercises to accurately measure the angle of knee movement more safely and easily, even when sutures remain immediately after knee surgery.

[0021] Therefore, in order to overcome the limitations of conventional knee rehabilitation exercise devices and methods as described above, it is desirable to present a knee angle measuring device and method for knee rehabilitation exercise with a new configuration that allows for safer and easier accurate measurement of the knee angle even immediately after knee surgery; however, a device or method that fully satisfies such requirements has not yet been presented. Prior art literature

[0023] Korean Published Patent Application No. 10-2023-0030964 (March 7, 2023) The problem to be solved

[0024] The present invention aims to solve the problems of the prior art as described above. Accordingly, the objective of the present invention is to address the limitations of prior art knee rehabilitation devices and methods, which lacked a device or method capable of easily measuring the knee angle for post-surgical rehabilitation. This is achieved by providing a knee angle measurement system and method configured in the form of a wearable knee angle measuring tool that allows for more convenient and easy measurement of the knee joint angle, even while the sutures are still in place. This is done to overcome the limitations of prior art knee rehabilitation devices and methods, which, for example, require knee rehabilitation exercises to restore knee angle and muscle strength during the recovery period due to accidents or diseases such as artificial joint surgery, and it is desirable to provide appropriate rehabilitation exercises to the patient by wearing rehabilitation equipment and checking the knee angle.

[0026] Furthermore, another objective of the present invention is to provide a knee angle measurement system and method for knee rehabilitation exercises that overcomes the limitations of conventional knee rehabilitation exercise devices and methods, which, as described above, failed to provide a device or method capable of easily measuring the knee angle for rehabilitation exercises after knee surgery. This is achieved by configuring the device in the form of a wearable knee angle measuring device that enables safe measurement by designing the strap position so as not to come into contact with the surgical site when worn, and by configuring it to be linked in real-time with a digital therapeutic agent and a dedicated application program for knee rehabilitation exercises, allowing the device's operation to be controlled and measurement results to be verified via the app. This enables patients requiring rehabilitation exercises to measure the knee joint angle more conveniently and easily, even while stitches are still present immediately after knee surgery, thereby further enhancing the effectiveness and efficiency of the rehabilitation exercises. means of solving the problem

[0028] To achieve the above-mentioned purpose, according to the present invention, a knee angle measuring system for knee rehabilitation exercises is provided, comprising: a knee angle measuring device unit formed in the form of a wearable knee angle measuring device for measuring the knee angle by wearing it on a user's leg; and a user terminal configured to control the overall operation of the knee angle measuring device unit and to perform processing to receive and provide the measurement results to the user.

[0030] Here, the user terminal is characterized by being configured by installing a dedicated application program linked to the knee angle measuring device unit on a personal portable information and communication terminal including a smartphone or tablet PC, or on an information processing device including a PC or laptop.

[0032] In addition, the knee angle measuring device is characterized by comprising: a thigh connecting part worn on the user's thigh; a calf connecting part worn on the user's calf; a rotational connecting part connecting the thigh connecting part and the calf connecting part so as to rotate in accordance with the user's knee bending and straightening motion; a plurality of fixing parts formed on one side of each of the thigh connecting part and the calf connecting part to secure the thigh connecting part and the calf connecting part to the user's leg using Velcro tape or a strap; a sensor part comprising a measuring sensor for measuring the user's knee angle; a communication part comprising a communication module for transmitting the measured value measured through the sensor part to a user terminal; a power part comprising a battery and a charging terminal for supplying power; and a control part configured to perform processing for controlling the overall operation of the knee angle measuring device.

[0034] In addition, the knee angle measuring device is characterized by further comprising a PCB case integrally formed with the sensor unit, the communication unit, the power supply unit, and the control unit built inside.

[0036] Furthermore, the sensor unit is characterized by being configured using an IMU (Inertial Measurement Unit) sensor.

[0038] In addition, the communication unit is characterized by being configured using short-range wireless communication including at least one of Bluetooth, NFC (Near Field Communication), ZigBee, and RFID (Radio-Frequency IDentification).

[0040] In addition, the knee angle measuring device is characterized by being configured such that the measured value obtained through the sensor unit is transmitted to the user terminal through the communication unit and displayed through an app installed on the user terminal, and that overall operation can be controlled through the app installed on the user terminal.

[0042] Furthermore, the knee angle measuring device is characterized by being configured such that the distance between the fixing part formed on the thigh connection part and the fixing part formed on the calf connection part is greater than a predetermined certain distance in order to avoid contact with the surgical site (stitch).

[0044] In addition, the knee angle measuring device is characterized by being configured to allow the lengths of the thigh connecting part and the calf connecting part to be adjusted according to the user's physical condition.

[0046] In addition, according to the present invention, a rehabilitation exercise service providing system configured to perform a process of providing rehabilitation exercises customized to a user according to the user's knee angle is provided, comprising: a knee angle measuring unit for measuring the knee angle of each user; a user terminal for requesting a service desired by the user and providing the user with a measurement result and rehabilitation exercise content measured through the knee angle measuring unit; and a server configured to receive the knee angle measurement result measured for each user in conjunction with each of the knee angle measuring units and the user terminal, build a database related to knee angle measurement, and perform a process of providing rehabilitation exercises customized to each user according to a predetermined setting based on the contents of the database and the user's knee angle measured in real time, wherein the knee angle measuring unit and the user terminal are configured using the knee angle measuring system for knee rehabilitation exercises described above.

[0048] Here, the server is characterized by being configured to automatically perform a process of providing a user-customized rehabilitation exercise service by using an artificial intelligence algorithm based on deep learning, machine learning, an artificial neural network (ANN), or a convolutional neural network (CNN), selecting a rehabilitation exercise content suitable for the user from among the rehabilitation exercise content pre-stored in the database based on the measurement value received in real time through the knee angle measuring unit and the data stored in the database, and providing it through the user's terminal. Effects of the invention

[0050] As described above, according to the present invention, a knee angle measurement system and method for knee rehabilitation exercises are provided, configured in the form of a wearable knee angle measuring device capable of safe measurement by designing the strap position so as not to come into contact with the surgical site when worn, and configured to be linked in real-time with a digital therapeutic agent for knee rehabilitation exercises and a dedicated application program so that the operation of the device can be controlled and measurement results can be verified through the app. This allows patients requiring rehabilitation exercises to measure the angle of their knee joint more conveniently and easily even while sutures are still in place immediately after knee surgery, thereby further enhancing the effectiveness and efficiency of the rehabilitation exercises.

[0052] In addition, according to the present invention, a knee angle measurement system and method for knee rehabilitation exercises are provided, configured to enable more convenient and easy measurement of the knee joint angle even with sutures present after knee surgery as described above, thereby further enhancing the effectiveness and efficiency of rehabilitation exercises. This solves the problems of conventional knee rehabilitation exercise devices and methods, which had limitations in that a device or method capable of easily measuring the knee angle for rehabilitation exercises after knee surgery, such as artificial joint surgery, for example, was not presented. Brief explanation of the drawing

[0054] FIG. 1 is a block diagram schematically showing the overall configuration of a knee angle measurement system for knee rehabilitation exercises according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a specific configuration example of a knee angle measuring device part of a knee angle measuring system for knee rehabilitation exercise according to an embodiment of the present invention shown in FIG. 1. FIG. 3 is a drawing showing a rear view of a knee angle measuring device part according to an embodiment of the present invention shown in FIG. 2. FIG. 4 is a drawing showing a side view of a knee angle measuring device part according to an embodiment of the present invention shown in FIG. 2. FIG. 5 is a drawing showing the knee angle being measured using a knee angle measuring system for knee rehabilitation exercise according to an embodiment of the present invention shown in FIG. 1 to 4. FIG. 6 is a drawing showing the knee angle being measured using a knee angle measuring system for knee rehabilitation exercise according to an embodiment of the present invention shown in FIG. 1 to 4. FIG. 7 is a drawing showing the knee angle being measured using a knee angle measuring system for knee rehabilitation exercise according to an embodiment of the present invention shown in FIG. 1 to 4. Specific details for implementing the invention

[0055] Hereinafter, specific embodiments of the knee angle measurement system and method for knee rehabilitation exercise according to the present invention will be described with reference to the attached drawings.

[0057] Hereinafter, it should be noted that the following description is merely one embodiment for carrying out the present invention, and the present invention is not limited to the contents of the embodiment described below.

[0059] In addition, it should be noted that in the following description of the embodiments of the present invention, detailed descriptions of parts that are identical or similar to the prior art or that are deemed to be easily understood and implemented by those skilled in the art have been omitted for the sake of brevity.

[0061] Next, with reference to the drawings, specific details of the knee angle measurement system and method for knee rehabilitation exercise according to the present invention will be described.

[0063] More specifically, first, referring to FIG. 1, FIG. 1 is a block diagram schematically showing the overall configuration of a knee angle measurement system (10) for knee rehabilitation exercise according to an embodiment of the present invention.

[0065] As shown in FIG. 1, the knee angle measuring system (10) for knee rehabilitation exercise according to an embodiment of the present invention may be broadly configured to include a knee angle measuring device part (11) in the form of a wearable knee angle measuring device for measuring the knee angle by wearing it on a user's leg, and a user terminal (12) configured to control the overall operation of the knee angle measuring device part (11) and to perform processing to receive and provide the measurement result to the user.

[0067] In addition, the above-mentioned knee angle measuring device (11) may be configured in the form of a wearable knee angle measuring device, which is worn on the user's leg using, for example, a Velcro strap, as described below, and performs a process of measuring the knee angle through a sensor and transmitting the measured value to a user terminal (12) when the knee is moved.

[0069] In addition, the above-described user terminal (12) may be configured with dedicated hardware linked to the above-described knee angle measuring device unit (11), but preferably, it may be configured by installing a dedicated application program linked to the above-described knee angle measuring device unit (11) on an information and communication terminal that is portable by an individual, such as a smartphone or tablet PC, or on an information processing device such as a PC or laptop, and thereby, a simpler configuration and lower cost can be achieved without the need to implement separate hardware.

[0071] More specifically, referring to FIG. 2, FIG. 2 is a diagram schematically showing a specific configuration example of a knee angle measuring device part (11) of a knee angle measuring system (10) for knee rehabilitation exercise according to an embodiment of the present invention shown in FIG. 1.

[0073] Additionally, referring to FIGS. 3 and 4, FIGS. 3 and 4 are schematic drawings showing the rear view and the side view, respectively, of the knee angle measuring device part (11) according to the embodiment of the present invention shown in FIG. 2.

[0075] As shown in FIGS. 2 to 4, the knee angle measuring device (11) of the knee angle measuring system (10) for knee rehabilitation exercise according to an embodiment of the present invention may be broadly composed of a thigh connecting part (21) worn on the thigh portion of the user, a calf connecting part (22) worn on the calf portion of the user, a rotational connecting part (23) connecting the thigh connecting part (21) and the calf connecting part (22) so as to be rotatable in accordance with the movement of the user bending and straightening the knee, and a plurality of fixing parts (24) formed on one side of the thigh connecting part (21) and the calf connecting part (22) respectively to fix the thigh connecting part (21) and the calf connecting part (22) to the user's leg using Velcro tape, etc.

[0077] In addition, the above-described knee angle measuring device (11) may further comprise a PCB case (25) containing various electronic components, including a sensor unit comprising a measuring sensor for measuring the user's knee angle as shown in FIGS. 2 to 4, a communication unit comprising a communication module for transmitting the measured value measured through the sensor unit to a user terminal, a power unit comprising a battery and a charging terminal for supplying power, and a control unit configured to perform processing for controlling the overall operation of each of the above-described parts and the knee angle measuring device (11).

[0079] Here, the sensor unit described above may be configured using, for example, an IMU (Inertial Measurement Unit) sensor, and the communication unit described above is not subject to any particular limitations as long as it is capable of transmitting and receiving various data using wireless communication over a relatively short distance, such as Bluetooth, NFC (Near Field Communication), ZigBee, RFID (Radio-Frequency IDentification), etc. Accordingly, it should be noted that the present invention is not necessarily limited to the configuration shown in the above-described embodiment with reference to FIGS. 1 to 4, but can be configured by various modifications and changes as needed by those skilled in the art within the scope that does not deviate from the spirit and essence of the present invention.

[0081] In addition, the above-mentioned knee angle measuring device (11) is designed with a plurality of fixing parts (24) formed in the thigh connecting part (21) and the calf connecting part (22) respectively, so that the device can be fixed via a Velcro strap or the like at a location that does not touch the surgical site (maximum 20 cm) so that the patient can measure conveniently and safely immediately after surgery, and various controls such as power, start and stop of measurement can be performed through an app installed on the user terminal (12), and the device can be configured with a battery of sufficient capacity to enable continuous measurement, such as at least 10 times.

[0083] More specifically, the above-mentioned knee angle measuring device (11) may be configured such that the strap spacing between the fixing part (24) of the thigh connecting part (21) and the fixing part (24) of the calf connecting part (22) is at least 20 cm, for example, to avoid the measuring device coming into contact with the surgical site (stitch).

[0085] Alternatively, it should be noted that the present invention can be configured with various modifications and changes as needed, such as the above-mentioned knee angle measuring device (11) being configured to allow the lengths of the thigh connecting part (21) and the calf connecting part (22) to be adjusted according to each user's physical condition.

[0087] Therefore, from the configuration described above, a knee angle measurement system (10) for knee rehabilitation exercise according to an embodiment of the present invention can be easily implemented, and thereby, the knee angle can be measured more easily and safely even with stitches present after knee surgery.

[0089] That is, with reference to FIGS. 5 to 7, FIGS. 5 to 7 are drawings showing the actual measurement of the knee angle using the knee angle measuring system (10) for knee rehabilitation exercise according to an embodiment of the present invention configured as described above with reference to FIGS. 1 to 4.

[0091] As shown in FIGS. 5 to 7, the knee angle measurement method using the knee angle measurement system (10) for knee rehabilitation exercise according to an embodiment of the present invention first involves connecting Velcro tape or the like to each fixing part (24) formed on the thigh connecting part (21) and the calf connecting part (22) of the knee angle measurement device part (11) to fix the thigh connecting part (21) and the calf connecting part (22) to the user's thigh and calf area, respectively.

[0093] After that, when the user moves their knee, the thigh connecting part (21) and the calf connecting part (22) move together with the user's movement through the rotation connecting part (23), and at this time, the angle between the thigh connecting part (21) and the calf connecting part (22), that is, the user's knee angle, is measured through the IMU sensor embedded in the PCB case (25).

[0095] Next, the measurement value of the IMU sensor is transmitted to the user terminal (12) through the wireless communication module of the communication unit embedded in the PCB case (25) and displayed through the app, so that the user can check the measurement result more conveniently and easily through their user terminal (12) just by wearing the knee angle measuring device unit (11) and moving their knee.

[0097] In addition, since the respective fixing parts (24) formed in the thigh connecting part (21) and the calf connecting part (22) are designed to be fixed to the user's leg while avoiding the surgical site (stitch), it is possible to measure the knee angle more safely even with stitches present after surgery.

[0099] Here, in the above-described embodiment of the present invention, the present invention has been described using an example in which the knee angle is measured through an IMU sensor and the measured value is transmitted to and displayed on a user terminal (12) via wireless communication. However, the present invention is not necessarily limited to the content presented in the embodiment. That is, the present invention may be configured to measure the knee angle using various measurement sensors in addition to the above-described IMU sensor, and may be configured to provide the measurement result to the user through a separate display unit or output means instead of transmitting the measured value to the user terminal (12) or simultaneously. It should be noted that the present invention may be configured by various modifications and changes as needed by those skilled in the art within the scope that does not deviate from the spirit and essence of the present invention.

[0101] In addition, regarding the more specific details of the process of measuring the knee angle through the IMU sensor or the process of transmitting and displaying the measured value to the user terminal (12) via wireless communication in the embodiment of the present invention described above, since these details are obvious to those skilled in the art by referring to the contents of the angle measuring device and method or the wireless data communication device and method of the prior art, it should be noted that in order to simplify the explanation, the detailed description of the details that are obvious to those skilled in the art from the contents of the prior art as described above, or that can be easily understood and implemented by those skilled in the art by referring to the literature of the prior art, etc., has been omitted in the present invention.

[0103] Furthermore, the above-described system (10) may be configured to provide various rehabilitation training customized according to the angle measured in real time by including a server that is linked with each knee angle measuring device (11) and user terminal (12), although not illustrated, to receive and store knee angle measurement results for each user to build a database related to knee angle measurement, and to perform processing to provide appropriate rehabilitation exercises customized for each user.

[0105] In other words, especially after artificial joint surgery, sutures are usually removed after about two weeks, but if the recovery of the suture site is slow, the patient may be discharged without removing the sutures. During this recovery period, rehabilitation exercises to restore knee angle and muscle strength are essential, and for more effective rehabilitation, it is important to accurately determine the range of motion of the knee and perform appropriate rehabilitation exercises accordingly.

[0107] To this end, the above-described system (10) may be configured to perform a process of automatically selecting a rehabilitation exercise suitable for a user from a server based on measurements received in real time through a knee angle measuring device (11) and data stored in a database, using, for example, an artificial intelligence algorithm based on deep learning or machine learning, or an artificial neural network (ANN) or a convolutional neural network (CNN), and providing a customized rehabilitation exercise service through the user terminal (12) of the user.

[0109] Accordingly, as described above, a knee angle measurement system and method for knee rehabilitation exercises according to an embodiment of the present invention can be implemented. By doing so, according to the present invention, the strap position is designed so as not to come into contact with the surgical site when worn, thereby enabling safe measurement. Furthermore, by being configured to link in real-time with a digital therapeutic agent and a dedicated application program for knee rehabilitation exercises, allowing the measurement results to be verified through the app, patients requiring rehabilitation exercises can measure the angle of the knee joint more conveniently and easily even with stitches present immediately after knee surgery, and thereby further enhance the effectiveness and efficiency of the rehabilitation exercises.

[0111] Although the detailed contents of the knee angle measurement system and method for knee rehabilitation exercise according to the present invention have been described above through the embodiments of the present invention, the present invention is not limited only to the contents described in the above embodiments. Therefore, it is obvious that the present invention can be modified, changed, combined, and substituted in various ways according to design needs and other various factors by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0113] 10. Knee Angle Measurement System for Knee Rehabilitation Exercises 11. Knee angle measuring device section 12. User terminal 21. Thigh connection 22. Calf connection 23. Rotating connection part 24. Fixed part 25. PCB Case

Claims

Claim 1 A knee angle measuring system for knee rehabilitation exercises comprises: a knee angle measuring device unit formed in the form of a wearable knee angle measuring device for measuring the knee angle by being worn on a user's leg; and a user terminal configured to control the overall operation of the knee angle measuring device unit and to perform processing to receive and provide measurement results to the user. The knee angle measuring device unit comprises: a thigh connecting part worn on the user's thigh; a calf connecting part worn on the user's calf; a rotational connecting part connecting the thigh connecting part and the calf connecting part so as to rotate in accordance with the user's knee bending and straightening motion; a plurality of fixing parts formed on one side of the thigh connecting part and the calf connecting part, respectively, to secure the thigh connecting part and the calf connecting part to the user's leg using Velcro tape or a strap; a sensor unit comprising a measurement sensor for measuring the user's knee angle; a communication unit comprising a communication module for transmitting the measurement value measured through the sensor unit to the user terminal; and a power unit comprising a battery and a charging terminal for supplying power. A knee angle measuring system for knee rehabilitation exercise, comprising a control unit configured to perform processing to control the overall operation of the knee angle measuring device unit, wherein the knee angle measuring device unit is configured such that the distance between the fixing part formed on the thigh connection part and the fixing part formed on the calf connection part is greater than a predetermined distance in order to avoid contact with the surgical site (suture), thereby enabling safe and easy measurement of the knee joint angle even with sutures present after knee surgery, and thus enhancing the effectiveness and efficiency of rehabilitation exercise. Claim 2 A knee angle measuring system for knee rehabilitation exercise according to claim 1, characterized in that the user terminal is configured by installing a dedicated application program linked to the knee angle measuring device unit on a personal portable information and communication terminal including a smartphone or tablet PC, or an information processing device including a PC or laptop. Claim 3 delete Claim 4 A knee angle measuring system for knee rehabilitation exercise according to claim 1, wherein the knee angle measuring device further comprises a PCB case integrally formed with the sensor unit, the communication unit, the power supply unit, and the control unit built into it. Claim 5 A knee angle measurement system for knee rehabilitation exercise according to claim 1, characterized in that the sensor unit is configured using an IMU (Inertial Measurement Unit) sensor. Claim 6 A knee angle measurement system for knee rehabilitation exercise according to claim 1, wherein the communication unit is configured using short-range wireless communication including at least one of Bluetooth, NFC (Near Field Communication), ZigBee, and RFID (Radio-Frequency IDentification). Claim 7 A knee angle measuring system for knee rehabilitation exercise according to claim 1, wherein the knee angle measuring device is configured such that a measured value obtained through the sensor unit is transmitted to the user terminal through the communication unit and displayed through an app installed on the user terminal, and overall operation can be controlled through the app installed on the user terminal. Claim 8 delete Claim 9 A knee angle measuring system for knee rehabilitation exercise according to claim 1, wherein the knee angle measuring device is configured to allow the lengths of the thigh connecting part and the calf connecting part to be adjusted according to the user's physical condition. Claim 10 A rehabilitation exercise service providing system configured to perform a process of providing rehabilitation exercises customized to a user according to the user's knee angle, comprising: a knee angle measuring unit for measuring the knee angle of each user; a user terminal for requesting a service desired by the user and providing the user with a measurement result and rehabilitation exercise content measured through the knee angle measuring unit; and a server configured to receive knee angle measurement results measured for each user in conjunction with each of the knee angle measuring units and the user terminal, build a database related to knee angle measurement, and perform a process of providing rehabilitation exercises customized to each user according to a predetermined setting based on the contents of the database and the user's knee angle measured in real time, wherein the knee angle measuring unit and the user terminal are configured using a knee angle measuring system for knee rehabilitation exercises described in any one of claims 1, 2, 4 to 7, and 9. Claim 11 A rehabilitation exercise service providing system according to claim 10, wherein the server is configured to automatically perform a process of providing a user-customized rehabilitation exercise service by using an artificial intelligence algorithm based on deep learning, machine learning, an artificial neural network (ANN), or a convolutional neural network (CNN), to select a rehabilitation exercise content suitable for the user from among the rehabilitation exercise content pre-stored in the database based on a measurement value received in real time through the knee angle measuring unit and data stored in the database, and to provide it through the user's terminal.

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