Inertial measurement unit-based functional evaluation for adhesive capsulitis assessment

Chih Ya Chang, Yung Tsan Wu, Ching Yueh Lin, Te Jung Liu, Tsung Yen Ho, Yu Ping Shen, Kai Chun Liu, Ting Yang Lu, Li Wei Chou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Aims: The inertial measurement unit (IMU), as a sensor-based assessment tool, could provide objective and quantitative data for evaluating a patient with adhesive capsulitis (AC). The IMUs have advantages in simplification of implementation, cost, and computation complexity. We aimed to propose an IMU-based approach to extract statistical features for the assessment of AC in daily activity. Methods: Nine healthy subjects and nine AC patients participate in this experiment. The accelerometers are placed on the wrist and arm to measure the movement performance. Each subject is asked to perform three basic shoulder motions, including flexion, extension, and abduction. Eight types of features are extracted from the norm of accelerometer signals, including mean, standard deviation (SD), variation, maximum, minimum, range, kurtosis, and skewness. These features are explored to distinguish the differences in the movement performance between healthy subjects and AC patients. Statistical Analysis Used: Student's t-test and effect size (Cohen's d) are calculated to assess the reliability of the proposed evaluation approach. Results: The results show that the feature of SD extracted from the wrist can achieve significant differences and large effect sizes between healthy subjects and AC patients. Conclusion: We demonstrate the feasibility of the proposed IMU-based functional evaluation for the AC assessment using statistical features.

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalJournal of Medical Sciences (Taiwan)
Issue number3
StatePublished - 1 May 2022


  • Inertial measurement units
  • Student's t-test
  • adhesive capsulitis
  • effect size
  • statistical features


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