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Evaluation of an Inertial Sensor to Quantify Postural Stability Assessments in Young Healthy Individuals and Individuals with Chronic Ankle Instability

Bansbach, Heather (2017) Evaluation of an Inertial Sensor to Quantify Postural Stability Assessments in Young Healthy Individuals and Individuals with Chronic Ankle Instability. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Measures of postural stability are utilized in clinical and research settings and are important for prevention and rehabilitation of musculoskeletal injuries. Force-plates are often used to quantify postural stability in research settings, however due to cost and size are not readily available in clinical settings. Clinical tests of postural stability require minimal equipment and are easily implemented, but are restricted due to reliability and sensitivity. Low-cost inertial sensors may be an effective alternative to force-plates for objective postural stability assessment. However, there is limited research determining which measures and assessments are most reliable, valid and discriminatory in populations with postural stability deficits related to musculoskeletal injury. For sensor-based postural stability assessments to be implemented in clinical settings, they must be reliable, valid, and discriminatory in desired target populations. The purposes of this dissertation were to (i) establish the reliability of accelerometry measures of postural stability, (ii) establish the concurrent validity of accelerometry measures compared to force plate measures of postural stability and their ability to detect differences in task difficulty, and (iii) determine the ability of accelerometry measures to discriminate postural stability deficits in individuals with chronic ankle instability (CAI). A total of 50 young, active individuals (25 control, 25 CAI) were recruited to address the study aims. Ten accelerometry measures were extracted from a waist-worn sensor during each of ten postural stability tasks of varying difficulty (eight static, two dynamic). Force-plate data were collected concurrently. Several accelerometry measures of static and dynamic postural stability were found to be reliable within session and across three sessions in control and CAI groups. Within subject variability improved when at least three static or six dynamic trials were averaged. Static postural stability accelerometry measures showed weak (r<0.5) to strong (r≤0.75) associations with force-plate measures, while dynamic postural stability associations ranged from weak to moderate (0.5≤r<0.75). Accelerometry measures were sensitive to task difficulty and postural stability deficits in individuals with CAI. Overall, a subset of the accelerometer instrumented assessments provided reliable and valid, objective measures of postural stability. Integration with a mobile device will provide clinicians a low-cost, objective solution for postural stability assessment.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee CoChairSell,
Committee CoChairLoughlan,
Committee MemberBrubaker,
Committee MemberConnaboy,
Committee MemberLovalekar,
Committee MemberRedfern,
Committee MemberSejdic,
Date: 26 September 2017
Date Type: Publication
Defense Date: 9 June 2017
Approval Date: 26 September 2017
Submission Date: 24 July 2017
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 166
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Bioengineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Static postural stability, dynamic postural stability, ankle sprain, accelerometry
Date Deposited: 26 Sep 2018 05:00
Last Modified: 26 Sep 2018 05:15


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