WO2020053896A1

WO2020053896A1 - Wearable gait analysis system

Info

Publication number: WO2020053896A1
Application number: PCT/IN2019/050669
Authority: WO
Inventors: Deepak Joshi; Ashutosh Tiwari
Original assignee: Indian Institute Of Technology Delhi
Priority date: 2018-09-14
Filing date: 2019-09-12
Publication date: 2020-03-19

Abstract

The present subject matter relates to a gait analysis system (100). The gait analysis system (100) is wearable on a shoe of a user and not inside the shoe of the user. The gait analysis system (100) comprises a gait sensing unit (102) disposable along a base (106) of the shoe of the user and having a plurality of sensors (110) disposed anatomically within the gait sensing unit (102) for the measurement of gait parameters of the user. Further, a data acquisition unit (104) is connected to the gait sensing unit (102). The data acquisition unit (104) is to receive, store, and process the gait parameters of the user measured by the gait sensing unit (102).

Description

WEARABLE GAIT ANALYSIS SYSTEM

TECHNICAL FIELD

[0001] The subject matter described herein, in general, relates to gait analysis systems, and in particular relates to wearable gait analysis systems.

BACKGROUND

[0002] In general, gait analysis is an investigation of a gait pattern for the diagnosis of ambulatory-related pathologies. The gait pattern is analyzed to know the biomechanical variable associated with the human walking. Most of the neurological disorders affect the human gait pattern and therefore, assessment of the gait variable becomes an important aspect in monitoring and rehabilitating the patients with such disorders.

BRIEF DESCRIPTION OF THE DRAWINGS

[0003] The following detailed description references the drawings, wherein:

[0004] FIG. 1 shows a side view of a gait analysis system as per an implementation of the present subject matter.

[0005] FIG. 2 shows a perspective view of a gait sensing unit, as per an implementation of the present subject matter.

[0006] FIG. 3 shows perspective view of a first sensor holding platform, as per an implementation of the present subject matter.

[0007] FIG. 4 shows perspective view of a second sensor holding platform, as per an implementation of the present subject matter.

[0008] FIG. 5 shows a perspective view of a slider with a first rod, as per an implementation of the present subject matter.

[0009] FIG. 6 shows a perspective view of a front part assembly of a gait sensing unit, as per an implementation of the present subject matter. [0010] FIG. 7 shows a perspective view of a second sensor holding platform showing two degrees of movement in a horizontal and a vertical direction, as per an implementation of the present subject matter.

[0011] FIG. 8 shows a perspective view of an angle measurement module, as per an implementation of the present subject matter.

DETAILED DESCRIPTION

[0012] In general, walking is a highly coordinated process utilizing majorly two systems of a human body, i.e., the central nervous system (CNS) and the musculoskeletal system (MSS). The CNS is responsible for generating and transferring the command to the MSS for the initiation of the movement required for walking. Walking involves a unique pattern which repeats at a regular interval. Such a repetitive pattern of walking is studied by a gait analysis using characteristics parameters.

[0013] In a clinical gait analysis, the investigation of such repetitive patterns is carried out for the diagnosis of ambulatory related pathologies. The gait analysis incorporates three major components to be analyzed, namely kinematic, kinetic, and electromyography (EMG). Measurement of spatial and temporal kinematic parameters is important in the field of gait rehabilitation, clinical diagnosis, control of powered prosthesis, and orthotic devices. Kinematic temporal gait parameters, such as stance phase interval, swing phase interval, heel strike instance, and toe-off instance, and spatial gait parameters, such as stride length, step length, cadence, foot clearance, foot angle, and joint angle, can be measured by gait analysis system. Gait pattern is studied to know about the biomechanical variable associated with human walking. Most of the neurological disorders affects the human gait pattern, and therefore, assessment of the gait variable becomes an important aspect in monitoring and rehabilitating the patients with such disorders. Other factors which could lead to ambulatory dysfunction is physical injury (trauma), amputation, etc.

[0014] To analyze the gait pattern of the human being, all the gait biomechanical parameters are captured using a conventional gait analysis system in real time. To analyze the gait pattern of the human being, conventional portable gait analysis systems are used in outdoor real walking environment. Such portable gait analysis system is worn on a body of the human being with minimal weight and transmit the data wirelessly to a remotely located computing unit. Such portable gait analysis system facilitates data recording while subject walking naturally and over sufficiently long walkway. Such portable gait analysis system includes different components to capture essential gait parameters, for example, components based on mechanical sensors, such as Inertial measurement unit (IMU), force sensitive resistors (FSR), force myography (FMG), foot insole, and ultrasonic distance sensor.

[0015] Further, ground clearance is an important biomechanical parameter of a gait cycle to diagnose various disorders related to ambulatory dysfunction, such as Parkinson’s, multiple sclerosis (MS), diabetes, and cerebral palsy (CP). The ground clearance is important for biomechanical study in amputee and elderly population. In elderly population, a higher risk of falling is present and thereof subsequent injuries may be suffered that may reduce mobility, independence and may also increase the risk of premature death. In general, the cause of frequent falling of the elderly population while walking is tripping. Foot clearance (FC), particularly minimum toe clearance (MTC), which is defined as a minimum vertical distance of a bare foot/shoe from the ground is a potential gait parameter during mid-swing phase associated with tripping related fall in the elderly population. Although several other gait parameters both temporal and spatial like stride length, stride time, cadence, and velocity were used to identify and predict the tripping related falls in the elderly population, but since tripping is a condition caused by insufficiency of foot clearance during swing phase therefore, foot clearance becomes an important gait parameter to study.

[0016] Foot clearance estimation also plays an important role in the application of control of neural prosthesis and control of assistive devices to prevent falls in elderly. For the foot clearance estimation, a conventional gait analysis system is used, which carries out full motion analysis of a body segment using a 3D infrared (IR) based camera and a force capturing plate installed in a laboratory. Such gait analysis system is highly expensive, demands costly maintenance, create discomfort to the subject as the subject has to attach many passive markers on the body during preparation of the protocols. Further, such gait analysis system is restricted to laboratory settings only and the gait analysis in real walking environment cannot be carried. During such gait analysis, number of steps required for the analysis is limited to only few numbers within laboratory settings. Due to high cost and restrictive settings, such gait analysis system is limitedly available to patients and small clinics.

[0017] Another low cost conventional wearable sensor based on inertial measurement unit (IMU) is used to measure the foot clearance. However, such sensor suffers with a limited accuracy in the estimation of vertical distance of the foot from the ground. Such limited accuracy is because of inaccuracy in the measurement of orientation and also double integration of acceleration noise introduces drift in position estimation. Such accuracy obtained by the IMU based sensor remains within few centimeters which hardly satisfy the need of a reliable FC monitoring system.

[0018] Another conventional gait analysis system is utilized for the foot clearance estimation system based on infrared (IR) distance sensors. Such conventional gait analysis system involves 2D geometry and trigonometric calculations to estimate the foot clearance based on the distances provided by the IR sensors while walking of a subject. However, the IR sensors are mounted on a high heeled shoe and toe movement is totally restricted while walking of the subject in a sagittal plane. Therefore, the subjects gait is likely to be influenced by the type of shoe used and thus such shoe cannot be used for any clinical gait analysis. The sensors are fixed permanently on the shoe heel and toe position with no mechanism to adjust the position of sensors with respect to the ground as per the shoe size and dimensions, and thus, for accurate heel and toe clearance estimation, additional calculations are required and also such system is not suitable for shoe of different slzes. [0019] To this end, a gait analysis system is proposed, which is a highly accurate and simple foot clearance system. The gait analysis system is wearable on a shoe of a user. The gait analysis system includes a gait sensing unit and a data acquisition unit connected to the gait sensing unit. The gait sensing unit is disposable along a base of a shoe of a user. The base is positioned with respect to a flat surface. Further, the gait sensing unit includes a plurality of sensors disposed anatomically within the gait sensing unit with respect to the shoe for the measurement of gait parameters of the user. The data acquisition unit is to receive, store and process the gait parameters of the user measured by the gait sensing unit.

[0020] The gait sensing unit employs anatomically located sensors on the shoe for the measurement of various gait parameters, such as foot-to-ground angle (FGA) and foot clearance (FC). In one example, the sensors are infrared (IR) distance sensors. In one example, the gait sensing unit includes a high range distance sensor for a heel clearance estimation in a normal heeled shoe to reduce the heel size. In one example, the high range can be a range of 10 cm to 150 cm. In one example, the gait analysis system is wireless. The gait analysis system is used for application in medical and sports field. In one example, the gait analysis system is an instrumented shoe-based gait analysis system based on the IR distance sensors which can estimate the gait parameters with higher accuracy. The gait analysis system of the present subject matter includes a configuration which consists of a dedicated angle measurement module which is located between the heel and fifth metatarsal bone and includes at least two sensors. Such configuration allow rotation of both the sensors with a same angle simultaneously even in a stance phase thus providing higher accuracy in angle. Such configuration works fine with a rocker shoe. Such configuration works efficiently when the subject is walking with a free toe movement, which is a real scenario of walking. The gait sensing unit further includes a mechanism which allows adjustment of the position of each sensor of the plurality of sensors as per the requirement of size and dimension of the shoe. Such mechanism addresses the problem of system adaptability to different shoe size and allow the user to use the gait analysis system for any shoe independent of size and design. [0021] The gait analysis system of the present subject matter is adopted to monitor a foot clearance in real walking environment. Such gait analysis system not only estimate the FC with higher accuracy but also has a potential to estimate other essential gait parameters like cadence, heel strike, toe off, stance phase interval, swing phase interval, foot- to-ground angle, etc., for the applications like terrain classification, gait rehabilitation, quantification of Parkinson’s and diabetic gait, fall prediction, etc.

[0022] The gait analysis system of the present subject matter ensures measurement of FC and FGA parameter while walking in an unconstrained environment for clinical diagnosis purpose. At the same time, such gait analysis system is accurate, simple to use, cost-effective, and consumes less operating power. The gait analysis system of the present subject matter can be used by any user irrespective of the size of the shoe. The gait analysis system of the present subject matter is wireless for collecting the data over long walkway and with minimal movement artifacts.

[0023] The gait analysis system of the present subject matter is wearable and at the same time less prone to movement artifacts and comfortable to use with the body of the subject. The gait analysis system of the present subject matter can be used for variety of clinical applications, for example, neurological disease diagnosis affecting ambulation, gait rehabilitation, fall prediction in elderly, control of neural prosthesis, etc.

[0024] These and other advantages of the present subject matter would be described in a greater detail in conjunction with the FIGS. 1-8 in the following description. The manner in which the gait analysis system is implemented and used shall be explained in detail with respect to the FIGS. 1-8.

[0025] It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope. Furthermore, all examples recited herein are intended only to aid the reader in understanding the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects and implementations of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof. [0026] FIG. 1 shows a side view of a gait analysis system 100, as per an implementation of the present subject matter. The gait analysis system 100 includes a gait sensing unit 102 and a data acquisition unit 104. The gait sensing unit 102 is disposable along a base 106 of a shoe (not shown) of a user (not shown). The base 106 is positioned with respect to a flat surface 108. The gait sensing unit 102 includes a plurality of sensors 110-1, 2, 3, 4 (collectively referred to as 110 hereinafter) anatomically located on the base 106 of the shoe.

[0027] The gait sensing unit 102 includes a first sensor holding platform 112 for holding one sensor 110-1 of the plurality of sensors 110 at a toe position of the shoe. The gait sensing unit 102 further includes a second sensor holding platform 114 for holding one sensor 110-2 of the plurality of sensors 110 at a heel position of the shoe, and an angle measurement module 116 located between a heel and a fifth metatarsal bone of the user when the gait analysis system 100 is worn by the user. The gait sensing unit 102 is further described in detail in Fig 2.

[0028] FIG. 2 shows a perspective view of the gait sensing unit 102, as per an implementation of the present subject matter. The first sensor holding platform 112 includes a first through-hole 202, a second through-hole 204, a first sensor holder part 206, a second sensor holder part 208, and a slot 210 for electrical connection of the sensor 110-1. In one example, the slot 210 is disposable facing the flat surface 108. The sensor 110-1 is attached to the first sensor holder part 206 via the first through-hole 202 such that the sensor 110-1 is disposable facing the flat surface 108. The second sensor holder part 208 is attached to a first rod 212 via the second through-hole 204. In an implementation, the first rod 212 slides up and down within a first slider 214 to vertically adjust the position of the sensor 110-1 with respect to the flat surface 108. [0029] In an example, the gait sensing unit 102 includes a first rail 216, in which the first slider 214 of the first sensor holding platform 112 slides back and forth to adjust the position of the first sensor holding platform 112. Due to the vertical movement of the first rod 212 and the horizontal movement of the first slider 214, the first sensor holding platform 112 has a movement in two degrees of freedom.

[0030] Further, the second sensor holding platform 114 for holding one sensor 110-2 of the plurality of sensors 110 at a heel position of the shoe. The second sensor holding platform 114 includes a first through-hole 218, a second through- hole 220, a first sensor holder part 222, a second sensor holder part 224, and a second slot 226 for electrical connection of the sensor 110-2. In one example, the second slot 224 is disposable opposing the flat surface 108. The sensor 110-2 is attached to the first sensor holder part 222 via the first through-hole 218 such that the sensor 110-2 is disposable opposing the flat surface 108. The second sensor holder part 222 is attached to a second rod 228 via the second through-hole 220. The second rod 228 slides up and down within a second slider 230 to vertically adjust the position of the sensor 110-2 with respect to the flat surface 108.

[0031 ] Further, the gait sensing unit 102 includes a second rail 232, in which the second slider 230 of the second sensor holding platform 114 slides back and forth to adjust the position of the second sensor holding platform 114. The second sensor holding platform 114 has a movement in two degrees of freedom.

[0032] Further, in Fig. 2, the angle measurement module 116 is located in between a heel (not shown) and a fifth metatarsal bone (not shown) of the user when the gait analysis system 100 is worn by the user. The angle measurement module 116 includes at least two sensors 110-3, 110-4 of the plurality of sensors 100, a partition 234 disposed between the at least two sensors 110-3, 110-4. A hinge (not shown in Fig. 2) is provided to attach the angle measurement module 116 to a third rod (not shown), and at least one slot 236 for an electrical connection of the at least two sensors 110-3, 110-4. In one example, the number of slots in the angle measurement module 116 is two. The third rod moves in a vertical direction and in a horizontal direction for adjusting the angle measurement module 116. [0033] In one example, the sensors 110 are infrared (IR) distance sensors. In one example, the number of the sensors 110 disposed on the gait sensing unit 102 is four. One sensor 110-1 of the four sensors 110 is disposed at a toe position of the base 106 of the shoe. One sensor 101-2 of the four sensors 110 is disposed at a heel location of the base 106 of the shoe. Two sensors 110-3, 4 of the four sensors 100 make a pair and form an angle module for FGA measurement and fixed substantially at the middle of the base 106 of the shoe to measure foot orientation of the user. The selection of IR sensor 110 is done based on the anatomical locations and range. Since the normal toe clearance ranges from 3 cm to 14 cm therefore, the senor 110 having range of 4 cm to 30 cm is used, similarly normal heel clearance ranges from 3 cm to 35 cm and therefore, range of 20 m to 150 cm is used. The angle measurement module 116 uses the IR sensor 110 that has a range of 10 cm to 80 cm. IR sensors 110 are attached at the locations of a heel and a toe to track the trajectory of the heel and the toe while walking of the subject. In one example, the subject is a human being.

[0034] Returning to Fig. 1, the gait analysis system 100 intended to measure the gait parameters of a foot using a sensor assembly having the sensors 110 attached over the shoe along with the data acquisition unit 104. The gait analysis system 100 can be used to predict fall in the elderly population and patient with neurological diseases, to diagnose neurological conditions affecting ambulation like Parkinson’s, multiple sclerosis (MS), diabetes, spinal cord injury (SPI), cerebral palsy (CP), etc., to rehabilitate patients affected by neurological disorders, to control neural prosthesis and to identify the walking terrains and gait events. Pair of shoes is fitted with different range of infrared (IR) distance sensors 110 at different anatomical locations of the foot to measure foot clearance (FC) and drive the foot-to-ground angle (FGA). The sensors 110 incorporate IR light emitting diode (LED) which works as a transmitter and a photodiode which works as a detector. The sensors 110 work on the principle of triangularization and produces the output in the form of voltage depending on the distance of object from the sensors 110. The sensors 110 have been calibrated to obtain output in the form of distance using simple mapping of voltage to distance at step of 0.5 cm distance. [0035] In an implementation of the present subject matter, the data acquisition unit 104 includes a lid (not shown) for a battery compartment (not shown), a battery (not shown) for powering the plurality of sensors 110 and the data acquisition unit 104, a through-hole (not shown) to tighten the lid, a protrusion (not shown) for easily opening and closing the lid, a lid (not shown) for data acquisition circuit compartment (not shown), a storage unit (not shown) for storing the gait parameters received from the gait sensing unit 102, a processor (not shown) for processing the stored gait parameters, a slot (not shown) in the lid to access reset button (not shown) in the data acquisition circuit (not shown), a compartment (not shown) for the circuit, a hexagonal space (not shown) for a fastener placement to tighten the lid firmly, a slot (not shown) for data connection and power supply to the sensors 110.

[0036] FIG. 3 shows perspective view of the first sensor holding platform 112 for holding the sensor 110- 1 at the toe position of the shoe, as per an implementation of the present subject matter. In order to facilitate the movement of the sensor 110- 1 as per the shape and size of the shoe, movement in two degrees of freedom is provided for the first sensor holding platform 112. The first sensor holding platform 112 includes a first through-hole 202 to fix the sensor 110-1.

[0037] FIG. 4 shows perspective view of the second sensor holding platform 114 for holding the infrared sensor 110-2 at the heel position of the shoe, as per an implementation of the present subject matter. In order to facilitate the movement of the sensor 110-2 as per the shape and size of the shoe, movement in two degrees of freedom is provided for the second sensor holding platform 114. The second sensor holding platform 114 includes a first through-hole 218 to fix the sensor 110-2 using a fastener. In one example, the fastener is a nut-bolt.

[0038] FIG. 5 shows a perspective view of the first slider 214 with the first rod 212, as per an implementation of the present subject matter. The movement of the first sensor holding platform 112 in the vertical direction is done using the first rod 212 that slides up and down within the first slider 214 for adjustment in the vertical direction with respect to the flat surface 108. In one example, the flat surface can be ground. The first rod 212 includes a rod part 502 to hold the first sensor holding platform 112. The first slider 214 includes a slider part 504 that allows the rod to move up and down facilitating the adjustment of the vertical height of the sensor 110-1 with respect to the flat surface 108. The slider part 504 mate with the first rail 216. The slider part 504 includes a hexagonal space 506 to place the fastener and to tighten the slider part 504 on the rail with an Allen bolt, a through-passage 508 for placing the first rod 212 and a hexagon space to place a fastener and to tighten the rod with an Allen bolt. Similar configuration is applicable for the second slider with the second rod.

[0039] FIG. 6 shows a perspective view of a front part assembly 600 of the gait sensing unit 102, as per an implementation of the present subject matter. The front part assembly 600 includes the first rail 216 to move the first slider 214 back and forth. The first slider 214 moves back and forth in the first rail 216 and the first rod 212 slides up and down. The back and forth movement of the first sensor holding platform 112 in the horizontal direction using the first rail 216 facilitates the adjustment of the sensor position in the horizontal direction. The front part assembly 600 of the gait sensing unit 102 rests on the front part of the shoe that also holds the toe tracking IR sensor. Similarly, the heel sensor is located at the heel position whose mechanism of movement is similar to the toe sensor.

[0040] FIG. 7 shows the perspective view of the second sensor holding platform 114 showing two degrees of movement of the sensor 110-2 in the horizontal and vertical direction, as per an implementation of the present subject matter.

[0041 ] FIG. 8 shows the perspective view of the angle measurement module 116, as per an implementation of the present subject matter. The angle measurement module 116 includes the partition 234 between two sensors 110-3, 4 to avoid interference between them. The hinge 802 is provided to attach the angle measurement module 116 to the third rod, a pair of first through-holes 804 to tighten the third rod with the angle measurement module 116 using the fastener, a pair of second through-holes 806-1, 2 to fix the two sensors 110-3, 4 using the fasteners, and at least one slot for the electrical connection of the two sensors 110-3, 4. A slot 808 is provided in the angle measurement module 116 for electrical connections of the two sensors 110-3, 4.

[0042] Returning to FIG. 1., the sensors 110-1, 2 measures the line of sight (LOS) distance but to get the true distance, i.e., vertical distance, the angle of the shoe. The FGA in a sagittal plane obtained from the angle measurement module 116 is used for the FC correction. The angle measurement module 116 includes two sensors 110-3, 4 in place for the angle measurement. The angle measurement module 116 is attached with the third rod which can move in the vertical direction in up and down and can move in the horizontal direction similar to the sensors 110- 1, 2 of the heel and the toe. Since, the data obtained from the sensors 110- 1, 2 at heel and toe locations provides line of sight (LOS) distance which is not true FC and therefore, it has to be corrected with FGA angle by multiplying FC with cosine of FGA angle as shown in the FIG. 1. According to FIG. 1, d3 is the actual heel clearance whereas vertical distance d3 *cos(0) is the true HC, similarly d4 is the actual toe clearance and vertical distance d4*cos(0) is the true TC. The vertical distances d2*cos(0) and d3 *cos(0) from the sensors 110-1, 2 are utilized for FGA measurement using basic trigonometric calculation. The FGA is given by the mathematical formula

Where, L is the distance between the pair of sensors 110-3, 4

[0043] The acquired data in the form of voltage from the sensors 110 is low pass filtered in the data acquisition unit 104 to remove any unwanted frequency, which is above 16 Hz using Arduino board and this voltage is then converted to distance using the formula obtained from the calibration process. The data is further passed through Kalman estimator of the data acquisition unit 104 to reduce the fluctuations in the reading of the sensor data. The sensor data is serially transmitted to remotely located PC using Bluetooth (HC05) wireless transmission at a sampling frequency of 125 Hz. In one example, the gait analysis system 100 is powered using 9V rechargeable battery (from EBL, USA).

[0044] Although implementations for the gait analysis system 100 are described, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features are disclosed as implementations .

Claims

I/We claim:

1. A gait analysis system (100) wearable on a shoe of a user, the gait analysis system (100) comprising:

a gait sensing unit (102) disposable along a base (106) of the shoe of the user, the base (106) being positioned with respect to a flat surface (108), wherein the gait sensing unit (102) comprises a plurality of sensors (110) disposed anatomically within the gait sensing unit (102) with respect to the shoe for measurement of gait parameters of the user; and

a data acquisition unit (104) connected to the gait sensing unit (102), wherein the data acquisition unit (104) is to receive, store, and process the gait parameters of the user measured by the gait sensing unit (102).

2. The gait analysis system (100) as claimed in claim 1, wherein the gait sensing unit (102) comprises:

a first sensor holding platform (112) for holding one sensor (110-1) of the plurality of sensors (110) at a toe position of the shoe, wherein the first sensor holding platform (112) comprises a first through-hole (202), a second through-hole (204), a first sensor holder part (206), a second sensor holder part (208), and a slot (210) for electrical connection of the sensor (110-1), the slot (210) being disposable facing the flat surface (108), wherein the sensor (110-1) is attached to the first sensor holder part (206) via the first through-hole (202) such that the sensor (110- 1) is disposable facing the flat surface (108), and wherein the second sensor holder part (208) is attached to a first rod (212) via the second through-hole (204), and wherein the first rod (212) slides up and down within a first slider (214) to vertically adjust a position of the sensor (110-1) with respect to the flat surface (108).

3. The gait analysis system (100) as claimed in claim 2, wherein the gait sensing unit (102) comprises a first rail (216), in which the first slider (214) of the first sensor holding platform (112) slides back and forth to adjust a position of the first sensor holding platform (112).

4. The gait analysis system (100) as claimed in claim 3, wherein the first sensor holding platform (112) has a movement in two degrees of freedom.

5. The gait analysis system (100) as claimed in claim 1, wherein the gait sensing unit (102) comprises:

a second sensor holding platform (114) for holding one sensor (110-2) of the plurality of sensors (110) at a heel position of the shoe, wherein the second sensor holding platform (114) comprises a first through-hole (218), a second through-hole (220), a first sensor holder part (222), a second sensor holder part (224), and a slot (226) for electrical connection of the sensor (110-2), the slot (226) being disposable opposing the flat surface (108), wherein the sensor (110-2) is attached to the first sensor holder part (222) via the first through-hole (218) such that the sensor (110-2) is disposable opposing the flat surface (108), and the second sensor holder part (224) is attached to a second rod (228) via the second through- hole (220), and wherein the second rod (228) slides up and down within a second slider (230) to vertically adjust a position of the sensor (110-2) with respect to the flat surface (108).

6. The gait analysis system (100) as claimed in claim 5, wherein the gait sensing unit (102) comprises a second rail (232), in which the second slider (230) of the second sensor holding platform (114) slides back and forth to adjust a position of the second sensor holding platform (114).

7. The gait analysis system (100) as claimed in claim 5, wherein the second sensor holding platform (114) has a movement in two degrees of freedom.

8. The gait analysis system (100) as claimed in claim 1, wherein the gait sensing unit (102) comprises an angle measurement module (116) which is located in between a heel and a fifth metatarsal bone of the user when the gait analysis system (100) is worn by the user.

9. The gait analysis system (100) as claimed in claim 8, wherein the angle measurement module (116) comprises at least two sensors (110-3, 110-4) of the plurality of sensors (110), a partition (234) disposed between the at least two sensors (110-3, 110-4), a hinge (802) to attach the angle measurement module (116) to a third rod, and a slot (808) for an electrical connection of the at least two sensors (110-3, 110-4), wherein the third rod moves in a vertical direction and in a horizontal direction for adjusting the angle measurement module (116).

10. The gait analysis system (100) as claimed in claim 1, wherein the sensors (110) are infrared (IR) distance sensors.

11. The gait analysis system (100) as claimed in claim 1, wherein position of each sensor of the plurality of sensors (110) is adjusted as per requirement of size and dimension of the shoe.

12. The gait analysis system (100) as claimed in claim 1, wherein number of the sensors in the plurality of sensors (110) is four.

13. The gait analysis system (100) as claimed in claim 12, wherein one sensor (110-

1) of the four sensors is disposable at a toe position along the base (106) of the shoe for tracking a trajectory of a toe.

14. The gait analysis system (100) as claimed in claim 12, wherein one sensor (110-

2) of the four sensors is disposable at a heel location of the base (106) of the shoe for tracking a trajectory of a heel.

15. The gait analysis system (100) as claimed in claim 12, wherein two sensors (110-3, 110-4) of the four sensors are disposable substantially at the middle of the base (106) of the shoe and measure foot orientation of the user.

16. The gait analysis system (100) as claimed in claim 1, wherein the data acquisition unit (104) comprises a battery for powering the plurality of sensors (110) and the data acquisition unit (104), a storage unit for storing the gait parameters received from the gait sensing unit (102), a processor for processing the stored gait parameters, and a slot for data connection and power supply to the plurality of sensors (110).