Inertial Measurement Unit–Derived Ergonomic Metrics for Assessing Arm Use in Manual Wheelchair Users With Spinal Cord Injury: A Preliminary Report
Individuals with spinal cord injury (SCI) who use manual wheelchairs (MWCs) have a higher rate of rotator cuff pathology progression than able-bodied individuals.
Objectives:
This study aimed to test the ability of risk and recovery metrics of arm use to differentiate between (1) MWC users with SCI and matched able-bodied participants (cross-sectional matched-sample study) and (2) MWC users with rotator cuff pathology progression over 1 year from those without pathology progression (longitudinal study).
Methods:
Thirty-four MWC users and 34 age- and sex-matched able-bodied individuals were recruited. Upper arm risk (humeral elevation >60°) and recovery (static ≥5 seconds and humeral elevation <40°) metrics were calculated from wireless inertial measurement units (IMUs) worn on the upper arms and torso in the free-living environment. Two separate magnetic resonance imaging studies were completed and assessed for a subset of 16 MWC users approximately 1 year apart.
Results:
The frequency of risk events (
p
= .019), summated duration of recovery events (
p
= .025), and duration of each recovery event (
p
= .003) were higher for MWC users than able-bodied participants. The summated duration of risk events (
p
= .047), frequency of risk events (
p
= .027), and risk to recovery ratio (
p
= .02) were higher and the summated duration of recovery events (
p
= .036) and frequency of recovery events (
p
= .047) were lower for MWC users with rotator cuff pathology progression (
n
= 5) compared to those without progression (
n
= 11).
Conclusion:
IMU-derived metrics quantifying arm use at postures >60° and risk to recovery ratios may provide insights of potential risk factors for rotator cuff pathology progression.
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- Published
- Jan 01, 2021
- Vol/Issue
- 27(3)
- Pages
- 12-25
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