Method for measuring the function of joints and associated muscles

• US 5,755,675 A
• Filed: 07/17/1995
• Issued: 05/26/1998
• Est. Priority Date: 10/02/1992
• Status: Expired due to Fees

• Current Assignee: Teuvo Sihvonen
• Original Assignee: Teuvo Sihvonen
• Inventors: Sihvonen, Teuvo
• Primary Examiner(s): HINDENBURG, MAX F
• Application Number:
  US08/406,851
• Time in Patent Office: 1,044 Days
• Field of Search: 128/733, 128/774, 128/781, 128/782
• US Class Current: 600/594
• CPC Class Codes: A61B 5/103 Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes A61B5/08 takes precedence; measuring aids for tailors A41H1/00; measuring instruments specially adapted for dentistry A61C19/04
• CPC Class Codes: A61B 5/1116 Determining posture transitions
• CPC Class Codes: A61B 5/389 Electromyography [EMG]
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4561 Evaluating static posture, e.g. undesirable back curvature A61B5/1116 takes precedence
• CPC Class Codes: A61B 5/4824 Touch or pain perception evaluation A61B5/4821 takes precedence
• CPC Class Codes: A61B 5/6823 Trunk, e.g., chest, back, abdomen, hip
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2/72 Bioelectric control, e.g. myoelectric
• CPC Class Codes: A61F 2002/0894 Muscles non-implantable A61F2002/5066

Abstract

The invention relates to a method for measuring the function of joints and associated muscles. The method comprises measuring, on the one hand, the mobility of a person in a desired area and, on the other hand, simultaneously by means of electromyography (EMG) measuring the electrical activity of muscles in the same area, and evaluating the abnormality in the mobility and in the function of the muscles of said area, caused especially by pain, by comparing the measured values with reference values compiled in advance.

Claims

1. A method of measuring the function of joints and associated muscles, comprising the steps of:

measuring the mobility of a person in a desired area,

simultaneously measuring by means of electromyography (EMG) the electrical activity of muscles in the desired area,

evaluating any abnormality in the mobility and in the function of the muscles in the desired area, caused especially by pain, by comparing the measured values with reference values compiled in advance; and

determining the fatigability of an active muscle on the basis of changes in the frequency of an electric muscle signal.

2. A method according to claim 1, wherein the desired area is an area of the lumbar spine.

3. A method according to claim 2, wherein the desired flexion and extension of back muscles are measured as a difference between motions detected by motion sensors placed on an upper part of the lumbar spine and in a sacral area during the entire motion.

4. A method according to claim 1, further comprising a step for rendering flexion values of the back and corresponding electric muscle signals mutually comparable with respect to timing.

5. A method according to claim 2, further comprising a step for rendering flexion values of the back and corresponding electric muscle signals mutually comparable with respect to timing.

6. A method according to claim 3, further comprising a step for rendering flexion values of the back and corresponding electric muscle signals mutually comparable with a respect to timing.

7. A method according to claim 1, wherein the mobility measuring step includes continuously registering movements of the person in the desired area.

8. The method according to claim 1, wherein the mobility measuring step includes simultaneously measuring motion at two areas.

9. The method according to claim 1, wherein the changes in the frequency of the electric muscle signal are determined by a fast Fourier transformation.

10. The method according to claim 1, wherein the mobility measuring step comprises measuring a movement of the person in the desired area.

11. The method according to claim 10, wherein the movement is a movement of a spine of the person.

12. The method according to claim 1, wherein the mobility measuring step includes:

measuring a motion of a sacrum;

measuring a motion of a spine; and

calculating a relative motion of the spine with respect to the sacrum by comparing the measured motion of the sacrum with the measured motion of the spine.

13. The method according to claim 1, wherein the electrical activity measuring step includes measuring the electrical activity of the muscles during both flexion and extension.

14. The method according to claim 11, wherein the electrical activity measuring step includes measuring the electrical activity of the muscles during both flexion and extension.

15. The method according to claim 12, wherein the electrical activity measuring step includes measuring the electrical activity of the muscles during both flexion and extension.

16. The method according to claim 11, wherein the evaluating step includes a comparison of a timing of muscle contractions with the movement.

17. The method of claim 16, wherein the evaluating step further comprises an analysis of a relaxation phase signal generated between flexion and extension of the spine.