Journal
PHYSIOTHERAPY THEORY AND PRACTICE
Volume 38, Issue 1, Pages 226-234Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/09593985.2020.1723150
Keywords
Accelerometry; anterior cruciate ligament reconstruction; step time; stair descent; test-retest reliability; symmetry
Categories
Funding
- Haraldsplass Deaconess Hospital Research Fund
- Norwegian Fund for Post-Graduate training in Physiotherapy
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This study examined the within-day test-retest reliability and measurement error of step time and step time symmetry measured with a body-fixed IMU during stair descent in subjects after ACLR and in healthy subjects. The results demonstrated that mean step times measured with a body-fixed IMU and limb symmetry indexes calculated from these mean step times are precise and reliable in early post-operative rehabilitation after ACLR and in healthy subjects.
Background: Symmetry during stair descent can potentially be used as an early functional measure after anterior cruciate ligament reconstruction (ACLR). We have developed a novel application of a single accelerometer-based inertial motion unit (IMU) to identify foot strikes and calculate step times in an ordinary stairway. Purpose: To examine within-day test-retest reliability and measurement error of step time and step time symmetry measured with a body-fixed IMU during stair descent in subjects early after ACLR and in healthy subjects. Methods: Subjects after ACLR were tested twice 6 weeks (N = 15) and twice 3 months (N = 26) postoperatively. Eighteen healthy subjects were tested twice on one occasion. Subjects descended a flight of stairs at preferred speed. Trunk accelerometry data were collected with an inertial motion unit (IMU). Mean step times (MSTs) and limb symmetry index (LSI) of MSTs were calculated. Clinical trials registration number: NCT01279759. Results: Intraclass Correlation Coefficient (ICC (1,1)) for within test-retest reliability varied from 0.87 to 0.96 for MSTs and from 0.58 to 0.87 for LSIs. The 95% confidence interval (CI) for a true value varied from +/- 0.02 seconds (s) to +/- 0.05 s for MSTs and from +/- 4.6 percentage points (pp) to +/- 6.6 pp for LSIs. Conclusion: Mean step times measured with a body-fixed IMU during stair descent and limb symmetry indexes calculated from these mean step times are precise and reliable during early post-operative rehabilitation after ACLR and in healthy subjects.
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