Development of an Automatic Instrument for Efficient Measuring the Joint’s Range of Motion

  • Yeeun Jo
  • Myungjoon Kim
  • Yoon Jae Kim
  • Chiwon Lee
  • Eun Hye Park
  • Jun Won Park
  • Eunbong LeeEmail author
  • Sungwan KimEmail author


A range of motion (ROM) has been measured using several indices to judge the progress of ankylosing spondylitis (AS). However, measuring and calculating the ROM is time-consuming & labor-intensive and it would be even difficult to measure accurately. Thus, an automated measurement system (AMS) is proposed & developed to measure the ROM more easily without any restraint sensor, and to recognize changes in the ROM more constantly with the same standard of measurement. The measurement items are neck cervical rotation, cervical lateral flexion, finger-to-floor distance, intermalleolar distance, and lumbar side flexion. Data from 30 healthy subjects were collected by the AMS and their motions were recorded simultaneously by installed webcams to acquire gold-standard data compared with the measurement value of the AMS. The accuracy was determined by calculating the standard error of estimation (SEE) and a possibility of replacement of measurement obtained by a physician using a protractor & ruler has been assessed by pattern recognition of Bland-Airman plots. These statistical results exhibit a significant degree of agreement with the novel AMS. The total measurement time for the 5 items using the proposed AMS was less than 5 min, which is faster than manual measurement. However, the measurement was conducted against only healthy subjects; therefore additional tests with AS patients will be required for utilization in clinical practice.


Automatic measurement system (AMS) automation kinect range of motion (ROM) 


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Copyright information

© ICROS, KIEE and Springer 2019

Authors and Affiliations

  1. 1.Interdisciplinary Program for BioengineeringSeoul National UniversityJongno-Gu, SeoulKorea
  2. 2.Korea Electrotechnology Research InstituteSangnok-gu, Ansan-si, Gyeonggi-doKorea
  3. 3.Institute of Medical and Biological EngineeringSeoul National UniversityGwanak-gu, SeoulKorea
  4. 4.Department of Internal MedicineSeoul National University College of MedicineSeoulKorea
  5. 5.Department of Biomedical EngineeringSeoul National University College of MedicineSeoulKorea

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