1
|
Cho SY, Myong Y, Park S, Cho M, Kim S. A portable articulated dynamometer for ankle dorsiflexion and plantar flexion strength measurement: a design, validation, and user experience study. Sci Rep 2023; 13:22221. [PMID: 38097727 PMCID: PMC10721896 DOI: 10.1038/s41598-023-49263-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Accepted: 12/06/2023] [Indexed: 12/17/2023] Open
Abstract
Monitoring ankle strength is crucial for assessing daily activities, functional ability, and preventing lower extremity injuries. However, the current methods for measuring ankle strength are often unreliable or not easily portable to be used in clinical settings. Therefore, this study proposes a portable dynamometer with high reliability capable of measuring ankle dorsiflexion and plantar flexion. The proposed portable dynamometer comprised plates made of aluminum alloy 6061 and a miniature tension-compression load cell. A total of 41 healthy adult participants applied maximal isometric dorsiflexor and plantar flexor forces on a Lafayette Handheld Dynamometer (HHD) and the portable dynamometer. The results were cross-validated, using change in mean, and two independent examiners evaluated the inter-rater and test-retest reliabilities in separate sessions using intraclass correlation coefficients, standard error of measurement, and minimal detectable change. Both dorsiflexion and plantar flexion measurements demonstrated a strong correlation with the HHD (r = 0.827; r = 0.973) and showed high inter-rater and test-retest reliabilities. Additionally, the participant responses to the user experience questionnaire survey indicated vastly superior positive experiences with the portable dynamometer. The study findings suggest that the designed portable dynamometer can provide accurate and reliable measurements of ankle strengths, making it a potential alternative to current methods in clinical settings.
Collapse
Affiliation(s)
- Seung Yeon Cho
- Interdisciplinary Program in Bioengineering, The Graduate School, Seoul National University, Seoul, South Korea
| | - Youho Myong
- Department of Biomedical Engineering, Seoul National University College of Medicine, 103 Daehak-Ro, Jongno-Gu, Seoul, 03080, South Korea
- Department of Rehabilitation Medicine, Seoul National University Hospital, Seoul, South Korea
| | - Sungwoo Park
- Interdisciplinary Program in Bioengineering, The Graduate School, Seoul National University, Seoul, South Korea
- Institute of Innovative Medical Technology, Seoul National University Hospital Biomedical Research Institute, Seoul, South Korea
| | - Minwoo Cho
- Department of Transdisciplinary Medicine, Seoul National University Hospital, 101 Daehak-Ro, Jongno-Gu, Seoul, 03080, South Korea.
- Department of Medicine, Seoul National University College of Medicine, Seoul, South Korea.
| | - Sungwan Kim
- Interdisciplinary Program in Bioengineering, The Graduate School, Seoul National University, Seoul, South Korea.
- Department of Biomedical Engineering, Seoul National University College of Medicine, 103 Daehak-Ro, Jongno-Gu, Seoul, 03080, South Korea.
- Institute of Bioengineering, Seoul National University, Seoul, South Korea.
| |
Collapse
|
2
|
Drazan JF, Phillips WT, Seethapathi N, Hullfish TJ, Baxter JR. Moving outside the lab: Markerless motion capture accurately quantifies sagittal plane kinematics during the vertical jump. J Biomech 2021; 125:110547. [PMID: 34175570 PMCID: PMC8640714 DOI: 10.1016/j.jbiomech.2021.110547] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 05/27/2021] [Accepted: 05/31/2021] [Indexed: 10/21/2022]
Abstract
Markerless motion capture using deep learning approaches have potential to revolutionize the field of biomechanics by allowing researchers to collect data outside of the laboratory environment, yet there remain questions regarding the accuracy and ease of use of these approaches. The purpose of this study was to apply a markerless motion capture approach to extract lower limb angles in the sagittal plane during the vertical jump and to evaluate agreement between the custom trained model and gold standard motion capture. We performed this study using a large open source data set (N = 84) that included synchronized commercial video and gold standard motion capture. We split these data into a training set for model development (n = 69) and test set to evaluate capture performance relative to gold standard motion capture using coefficient of multiple correlations (CMC) (n = 15). We found very strong agreement between the custom trained markerless approach and marker-based motion capture within the test set across the entire movement (CMC > 0.991, RMSE < 3.22°), with at least strong CMC values across all trials for the hip (0.853 ± 0.23), knee (0.963 ± 0.471), and ankle (0.970 ± 0.055). The strong agreement between markerless and marker-based motion capture provides evidence that markerless motion capture is a viable tool to extend data collection to outside of the laboratory. As biomechanical research struggles with representative sampling practices, markerless motion capture has potential to transform biomechanical research away from traditional laboratory settings into venues convenient to populations that are under sampled without sacrificing measurement fidelity.
Collapse
Affiliation(s)
- John F Drazan
- Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, PA, United States
| | - William T Phillips
- Electrical and Computer Engineering Department, University of Rochester, University of Rochester, Rochester, NY, United States
| | - Nidhi Seethapathi
- Department of Bioengineering, University of Pennsylvania, Philadelphia, PA, United States
| | - Todd J Hullfish
- Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, PA, United States
| | - Josh R Baxter
- Department of Orthopedic Surgery, University of Pennsylvania, Philadelphia, PA, United States.
| |
Collapse
|