WO2012175037A1 - Devices and methods for measuring joint rotation of object - Google Patents

Devices and methods for measuring joint rotation of object Download PDF

Info

Publication number
WO2012175037A1
WO2012175037A1 PCT/CN2012/077348 CN2012077348W WO2012175037A1 WO 2012175037 A1 WO2012175037 A1 WO 2012175037A1 CN 2012077348 W CN2012077348 W CN 2012077348W WO 2012175037 A1 WO2012175037 A1 WO 2012175037A1
Authority
WO
WIPO (PCT)
Prior art keywords
joint
torque
bone
sensor
motion sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/077348
Other languages
French (fr)
Inventor
Tik-Pui Daniel FONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chinese University of Hong Kong CUHK
Original Assignee
Chinese University of Hong Kong CUHK
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chinese University of Hong Kong CUHK filed Critical Chinese University of Hong Kong CUHK
Publication of WO2012175037A1 publication Critical patent/WO2012175037A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4528—Joints
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
    • A61B5/1071—Measuring physical dimensions, e.g. size of the entire body or parts thereof measuring angles, e.g. using goniometers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
    • A61B5/1121—Determining geometric values, e.g. centre of rotation or angular range of movement
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4538—Evaluating a particular part of the muscoloskeletal system or a particular medical condition
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6802—Sensor mounted on worn items
    • A61B5/6811—External prosthesis

Definitions

  • the present application relates to devices and methods for measuring joint rotation of an object, in particular, devices and methods for measuring joint rotation of a person who has suffered from a joint injury.
  • the present application aims at a device and a method for measuring joint rotation of an object, which would provide an objective quantification of a laxity of the joint, especially in external and internal rotation.
  • a device for measuring rotation of a first joint of an object comprising: an orthosis for immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object; a torque sensor fixed to the orthosis for monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and a motion sensor for tracking a rotational displacement of the bone occurring under the applied torque.
  • a method for measuring rotation of a first joint of an object comprising: immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object; monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and tracking a rotational displacement of the bone under the applied torque.
  • Figure 1 is an illustrative block diagram of the device for measuring joint rotation according to an embodiment of the present application
  • Figure 2 is an illustrative flow chart of the method for measuring joint rotation according to an embodiment of the present application
  • Figures 3(a) and 3(b) illustrate an example of the device of Figure 1;
  • Figure 4 is an example of a real application of the device of Figure 3(a).
  • Figure 5 is an example of a cadaver test of the device of Figure 3(a).
  • a device 10 for measuring rotation of a first joint of an object shown is shown in Figure 1.
  • the device 10 comprises an orthosis 11, a torque sensor 12 and a motion sensor 13.
  • the orthosis 11 may be a common orthotic device that is used for immobilizing a second joint of the object, which is connected with the first joint by a bone of the object.
  • the torque sensor 12 is fixed to the orthosis for monitoring a value of torque applied to the object, in particular, the immobilized second joint. Since the second joint is immobilized, the applied torque is transferred to the first joint via the bone therebetween. The torque may be applied in a direction such that the first joint rotates inwardly or outwardly with the bone.
  • the torque sensor may be fixed to a bottom of the orthosis.
  • the torque sensor may be a load cell.
  • motion sensor 13 is arranged for tracking a rotational displacement of the bone occurring under the applied torque.
  • the motion sensor may be fixed to the torque sensor.
  • the motion sensor may also be arranged so that a longitudinal axis of the motion sensor is along the bone.
  • the motion sensor is an electromagnetic tracking sensor and may have an acquisition frequency of up to 120Hz.
  • tracking data with high accuracy may be obtained in time.
  • the obtained tracking data may represent a laxity (an extent of rotation) of the first joint under a certain torque, and may be output to an external device.
  • a handle may be fixed to the orthosis for applying the torque.
  • a handle bar may be fixed to the torque sensor so that the torque may be easily applied.
  • the first joint is a knee joint
  • the second joint is an ankle joint
  • the bone connecting the first and second joints is a tibia.
  • FIG. 3(a) and 3(b) A real application of the device is shown in Figure 4.
  • Figure 5. A cadaver test of the device is shown in Figure 5.
  • the orthosis takes the form of an ankle boot, which immobilizes the ankle joint of the object.
  • the torque sensor takes the form of a load cell, which is mounted to a heel region of the ankle boot.
  • the motion sensor takes the form of an electromagnetic motion sensor, which is attached to the load cell.
  • the longitudinal axis of the motion sensor is along the tibia's axis of rotation.
  • the tracking data obtained by the motion sensor are output to an external device such as a laptop computer.
  • the ankle joint is immobilized at step S21. After a torque is applied to the ankle boot, at step S22, a value of the applied torque is monitored. The applied torque transfers to the knee joint via the tibia.
  • the tibia Under the torque, the tibia is moved. Upon the movement, a rotational displacement of the tibia is obtained by the motion sensor. Based on the obtained data, the laxity of the knee joint under each torque are determined. Since the torque may be applied in a direction such that the knee joint rotates inwardly or outwardly, the extent of rotation of the knee joint under each torque is obtained.
  • a cadaveric experiment was performed to evaluate the validity and reliability of the present application based on the configuration shown in Figure 5.
  • Five cadaver lower limbs were obtained.
  • a bone-pin based motion analysis system was employed as the golden standard.
  • two research staffs conducted the test by applying internal and external rotation torque from 0 to 7N to the tibia of the cadaver.
  • the tests were performed with the knee flexed at 30 degree and 90 degree.
  • Data were analyzed using intra-class correlation (ICC) and standard error of measurement (SEM). Results in the following two Tables demonstrated excellent validity and reliability in the device.
  • ICC intra-class correlation
  • SEM standard error of measurement
  • Tester 1 Tester 2
  • the device, system and method according to the present application quantify and evaluate the joint rotational laxity for clinical use, especially for orthopaedics physicians to examine the knee rotational laxity of patients suffering from knee ligamentous injury, and to monitor their rehabilitation progress during follow-up consultations.
  • this device, system and method are also applicable for the use in field, physiotherapy treatment room and operation theater.
  • the target user groups will be mainly the orthopaeics surgeons, but also the general physicians, physiotherapists, sport biomechanics researchers as well as coaches and team physicians.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Rheumatology (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Geometry (AREA)
  • Physiology (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Rehabilitation Tools (AREA)

Abstract

Disclosed are a device (10) and a method (20) for measuring joint rotation of an object, which would provide an objective quantification of a laxity of the joint, especially in external and internal rotation. The device (10) for measuring rotation of a first joint of an object comprise: an orthosis (11) for immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object; a torque sensor (12) fixed to the orthosis (11) for monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and a motion sensor (13) for tracking a rotational displacement of the bone occurring under the applied torque.

Description

DEVICES AND METHODS FOR MEASURING JOINT ROTATION OF OBJECT
Cross Reference of Related Applications
[0001]This application claims the benefit of U.S. provisional patent application No. 61/499,690 filed on June 22, 2012, which is explicitly incorporated by reference in its entirety as part of this application.
Technical Field
[0002]The present application relates to devices and methods for measuring joint rotation of an object, in particular, devices and methods for measuring joint rotation of a person who has suffered from a joint injury.
Background
[0003]In the past, assessment of joint laxity is mainly relied on clinical examination, which is subjective.
Summary
[0004]The present application aims at a device and a method for measuring joint rotation of an object, which would provide an objective quantification of a laxity of the joint, especially in external and internal rotation.
[0005]According to an aspect of the application, provided is a device for measuring rotation of a first joint of an object, comprising: an orthosis for immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object; a torque sensor fixed to the orthosis for monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and a motion sensor for tracking a rotational displacement of the bone occurring under the applied torque.
[0006]According to another aspect of the application, provided is method for measuring rotation of a first joint of an object, comprising: immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object; monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and tracking a rotational displacement of the bone under the applied torque. Drawings
[0007]Figure 1 is an illustrative block diagram of the device for measuring joint rotation according to an embodiment of the present application;
[0008]Figure 2 is an illustrative flow chart of the method for measuring joint rotation according to an embodiment of the present application;
[0009]Figures 3(a) and 3(b) illustrate an example of the device of Figure 1;
[0010]Figure 4 is an example of a real application of the device of Figure 3(a); and
[0011]Figure 5 is an example of a cadaver test of the device of Figure 3(a).
Detailed Description
[0012] Hereinafter, embodiments according to the present application will be described with reference to the accompanying drawings.
[0013] A device 10 for measuring rotation of a first joint of an object shown is shown in Figure 1. As shown, the device 10 comprises an orthosis 11, a torque sensor 12 and a motion sensor 13.
[0014] The orthosis 11 may be a common orthotic device that is used for immobilizing a second joint of the object, which is connected with the first joint by a bone of the object.
[0015] The torque sensor 12 is fixed to the orthosis for monitoring a value of torque applied to the object, in particular, the immobilized second joint. Since the second joint is immobilized, the applied torque is transferred to the first joint via the bone therebetween. The torque may be applied in a direction such that the first joint rotates inwardly or outwardly with the bone. The torque sensor may be fixed to a bottom of the orthosis. The torque sensor may be a load cell.
[0016] motion sensor 13 is arranged for tracking a rotational displacement of the bone occurring under the applied torque. The motion sensor may be fixed to the torque sensor. The motion sensor may also be arranged so that a longitudinal axis of the motion sensor is along the bone.
[0017] In an example, the motion sensor is an electromagnetic tracking sensor and may have an acquisition frequency of up to 120Hz. Thus, tracking data with high accuracy may be obtained in time. The obtained tracking data may represent a laxity (an extent of rotation) of the first joint under a certain torque, and may be output to an external device. [0018] According to an embodiment, a handle may be fixed to the orthosis for applying the torque. For example, a handle bar may be fixed to the torque sensor so that the torque may be easily applied.
[0019]In an example, the first joint is a knee joint, the second joint is an ankle joint, and the bone connecting the first and second joints is a tibia.
[0020]An example of the device is shown in Figures 3(a) and 3(b). A real application of the device is shown in Figure 4. A cadaver test of the device is shown in Figure 5.
[0021] Hereinafter, a method 20 for measuring rotation of a first joint of an object will be described with an assumption that the first joint is a knee joint, the second joint is an ankle joint, and the bone connecting the first and second joints is a tibia with reference to Figure 2 in combination with Figures 3(a), 3(b), 4 and 5.
[0022] In Figures 4 and 5, the orthosis takes the form of an ankle boot, which immobilizes the ankle joint of the object. The torque sensor takes the form of a load cell, which is mounted to a heel region of the ankle boot. The motion sensor takes the form of an electromagnetic motion sensor, which is attached to the load cell. The longitudinal axis of the motion sensor is along the tibia's axis of rotation. The tracking data obtained by the motion sensor are output to an external device such as a laptop computer. According to the method, the ankle joint is immobilized at step S21. After a torque is applied to the ankle boot, at step S22, a value of the applied torque is monitored. The applied torque transfers to the knee joint via the tibia. Under the torque, the tibia is moved. Upon the movement, a rotational displacement of the tibia is obtained by the motion sensor. Based on the obtained data, the laxity of the knee joint under each torque are determined. Since the torque may be applied in a direction such that the knee joint rotates inwardly or outwardly, the extent of rotation of the knee joint under each torque is obtained.
[0023] A cadaveric experiment was performed to evaluate the validity and reliability of the present application based on the configuration shown in Figure 5. Five cadaver lower limbs were obtained. A bone-pin based motion analysis system was employed as the golden standard. After attaching marker, i.e., motion trackers, to the femur and tibia, two research staffs conducted the test by applying internal and external rotation torque from 0 to 7N to the tibia of the cadaver. The tests were performed with the knee flexed at 30 degree and 90 degree. Data were analyzed using intra-class correlation (ICC) and standard error of measurement (SEM). Results in the following two Tables demonstrated excellent validity and reliability in the device.
Table One. Iiitra-c!ass correlation.
Intra ICC Inter ICC
Tester 1 Tester 2
30 deg 0.994 0.996 0.996
90 deg 0.979 0.992 0.931
Table Two. Standard error of measurement.
SEh !
External rotation Internal rotation
(deg) (deg)
30 Deg
3 Noi 0.5074 0.3256
5 NIB 0.2225 0.6079
7 m 0.2037 1.0592
90 Deg
3 ΝΏΙ 0.5298 0.3273
5 Nm 0.7709 0.4799
7 Nm 1.0015 0.765
[0024] The device, system and method according to the present application quantify and evaluate the joint rotational laxity for clinical use, especially for orthopaedics physicians to examine the knee rotational laxity of patients suffering from knee ligamentous injury, and to monitor their rehabilitation progress during follow-up consultations. Beside clinic, this device, system and method are also applicable for the use in field, physiotherapy treatment room and operation theater. The target user groups will be mainly the orthopaeics surgeons, but also the general physicians, physiotherapists, sport biomechanics researchers as well as coaches and team physicians.
[0025] It is understood for those skilled in the art that embodiments described herein are illustrative, but not limited. Technical features disclosed in various embodiments can be combined in any appropriate ways. Various modifications and variations of the described embodiments can be made within the scope and spirit of the present application.

Claims

WHAT IS CLAIMED IS:
1. A device for measuring rotation of a first joint of an object, comprising:
an orthosis for immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object;
a torque sensor fixed to the orthosis for monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and
a motion sensor for tracking a rotational displacement of the bone occurring under the applied torque.
2. The device of claim 1, wherein the motion sensor is arranged so that a longitudinal axis of the motion sensor is along the bone.
3. The device of claim 1, further comprising:
a handle fixed to the torque sensor for applying the torque.
4. The device of claim 1, wherein the torque is applied in a direction such that the first joint rotates inwardly or outwardly with the bone.
5. The device of claim 1, wherein the torque sensor is a load cell.
6. The device of claim 1, wherein the motion sensor is fixed to the torque sensor.
7. The device of claim 1, wherein the motion sensor is an electromagnetic tracking sensor.
8. The device of claim 1, wherein the first joint is a knee joint and the second joint is an ankle joint.
9. A method for measuring rotation of a first joint of an object, comprising:
immobilizing a second joint of the object, the second joint being connected to the first joint by a bone of the object;
monitoring a value of torque applied to the second joint, the applied torque being transferred to the first joint via the bone; and
tracking a rotational displacement of the bone occurring under the applied torque.
10. The method of claim 9, before monitoring the value of torque applied to the second joint, further comprising:
applying a torque to the second joint.
11. The method of claim 10, wherein the torque is applied in a direction such that the first joint rotates inwardly or outwardly with the bone.
12. The method of claim 9, wherein the first joint is a knee joint and the second joint is an ankle joint.
PCT/CN2012/077348 2011-06-22 2012-06-21 Devices and methods for measuring joint rotation of object Ceased WO2012175037A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161499690P 2011-06-22 2011-06-22
US61/499,690 2011-06-22

Publications (1)

Publication Number Publication Date
WO2012175037A1 true WO2012175037A1 (en) 2012-12-27

Family

ID=47362498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/077348 Ceased WO2012175037A1 (en) 2011-06-22 2012-06-21 Devices and methods for measuring joint rotation of object

Country Status (2)

Country Link
US (1) US20120330193A1 (en)
WO (1) WO2012175037A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335674A (en) * 1991-08-01 1994-08-09 Drexel University Apparatus and method for determining load-displacement and flexibility characteristics of a joint
US5919148A (en) * 1996-03-27 1999-07-06 Marko; Alexei J. Apparatus and method for evaluation of shoulder stability
WO2005104945A2 (en) * 2004-05-04 2005-11-10 Imperial Innovations Limited Measurement of laxity of human joints
EP2394573A1 (en) * 2010-06-11 2011-12-14 Arthrex, Inc. Knee ligament testing device for measuring drawer and rotational laxity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335674A (en) * 1991-08-01 1994-08-09 Drexel University Apparatus and method for determining load-displacement and flexibility characteristics of a joint
US5919148A (en) * 1996-03-27 1999-07-06 Marko; Alexei J. Apparatus and method for evaluation of shoulder stability
WO2005104945A2 (en) * 2004-05-04 2005-11-10 Imperial Innovations Limited Measurement of laxity of human joints
EP2394573A1 (en) * 2010-06-11 2011-12-14 Arthrex, Inc. Knee ligament testing device for measuring drawer and rotational laxity

Also Published As

Publication number Publication date
US20120330193A1 (en) 2012-12-27

Similar Documents

Publication Publication Date Title
Lustig et al. The KneeKG system: a review of the literature
Heiderscheit et al. Effects of step rate manipulation on joint mechanics during running
Hellem et al. Review of shoulder range of motion in the throwing athlete: distinguishing normal adaptations from pathologic deficits
Nussbaumer et al. Validity and test-retest reliability of manual goniometers for measuring passive hip range of motion in femoroacetabular impingement patients.
Li et al. The effect of poststroke impairments on brachialis muscle architecture as measured by ultrasound
Malfait et al. How reliable are lower limb kinematics and kinetics during a drop vertical jump?
Sakaguchi et al. Gender differences in hip and ankle joint kinematics on knee abduction during running
Yang et al. On the relationship between tibia torsional deformation and regional muscle contractions in habitual human exercises in vivo
Liu et al. Investigation of normal knees kinematics in walking and running at different speeds using a portable motion analysis system
Neville et al. Comparison of changes in posterior tibialis muscle length between subjects with posterior tibial tendon dysfunction and healthy controls during walking
Sakamoto et al. Validity and reproducibility of foot motion analysis using a stretch strain sensor
Kerkhoffs et al. A measurement device for anterior laxity of the ankle joint complex
Wong et al. Passive motion characteristics of the talocrural and the subtalar joint by dual Euler angles
Weinhandl et al. Effects of gait speed of femoroacetabular joint forces
Gadikota et al. Effect of increased iliotibial band load on tibiofemoral kinematics and force distributions: a direct measurement in cadaveric knees
Stoltze et al. Development and functional testing of an unloading concept for knee osteoarthritis patients: A pilot study
Ancillao et al. Validation of Ankle Strength Measurements by Means of a Hand‐Held Dynamometer in Adult Healthy Subjects
Panero et al. Two‐Segment Foot Model for the Biomechanical Analysis of Squat
Dalton et al. Substantiating appropriate motion capture techniques for the assessment of nordic walking gait and posture in older adults
Southgate et al. Motion analysis in sport
US20180160977A1 (en) Portable joint testing device
Lovern et al. Dynamic tracking of the scapula using skin-mounted markers
Gallow et al. Clinical aspects of running gait analysis
Willis et al. Sex differences in frontal and transverse plane hip and knee kinematics during the modified star excursion balance test
Végvári et al. Does proximal rectus femoris release influence kinematics in patients with cerebral palsy and stiff knee gait?

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12803071

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12803071

Country of ref document: EP

Kind code of ref document: A1