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Purpose <p>This study aimed to evaluate the ability of a thigh-worn accelerometer to detect walking during daily life in individuals with Lumbar Spinal Stenosis (LSS). Two hypotheses were made regarding how walking measurements from the accelerometer, a walking test, and an ankle-worn StepWatch would relate in order for the accelerometer to be valid. The hypotheses were: (a) there is no difference between the longest walk recorded by the accelerometer during daily life and the maximum walking duration in a walking test, and (b) the accelerometer agrees with the StepWatch in measuring total daily steps.</p> Methods <p>This cross-sectional observational study on construct validity included 83 individuals with LSS who had a thigh-worn accelerometer for seven days and completed a walking test. Twenty-one also had an ankle-worn StepWatch simultaneously.</p> Results <p>The duration of the longest walk recorded by the thigh-worn accelerometer and the walking test significantly agreed within an equivalence margin of 34%.</p> <p>The thigh-worn accelerometer recorded fewer steps per day than the ankle-worn StepWatch, Bland-Altman 95% limits of agreement at −162% to 35%, mean difference − 64%. Post hoc analysis showed agreement on step count during continuous walking, Bland-Altman limits of agreement at −7.1% to 1.8%, mean difference − 2.6%.</p> Conclusion <p>The results suggest that a thigh-worn accelerometer can monitor continuous walking in daily life in individuals with LSS. The thigh-worn accelerometer did not agree with the ankle-worn StepWatch on daily steps. Device type and wear-site should be considered when interpreting step data.</p>

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Methods matter- construct validity of steps per day in patients with lumbar spinal stenosis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月26日

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  • Malin Eleonora av Kák Gustafsson,
  • Berit Schiøttz-Christensen,
  • Niels Wedderkopp,
  • Søren Francis Dyhrberg O’Neill,
  • Jan Christian Brønd

摘要

Purpose

This study aimed to evaluate the ability of a thigh-worn accelerometer to detect walking during daily life in individuals with Lumbar Spinal Stenosis (LSS). Two hypotheses were made regarding how walking measurements from the accelerometer, a walking test, and an ankle-worn StepWatch would relate in order for the accelerometer to be valid. The hypotheses were: (a) there is no difference between the longest walk recorded by the accelerometer during daily life and the maximum walking duration in a walking test, and (b) the accelerometer agrees with the StepWatch in measuring total daily steps.

Methods

This cross-sectional observational study on construct validity included 83 individuals with LSS who had a thigh-worn accelerometer for seven days and completed a walking test. Twenty-one also had an ankle-worn StepWatch simultaneously.

Results

The duration of the longest walk recorded by the thigh-worn accelerometer and the walking test significantly agreed within an equivalence margin of 34%.

The thigh-worn accelerometer recorded fewer steps per day than the ankle-worn StepWatch, Bland-Altman 95% limits of agreement at −162% to 35%, mean difference − 64%. Post hoc analysis showed agreement on step count during continuous walking, Bland-Altman limits of agreement at −7.1% to 1.8%, mean difference − 2.6%.

Conclusion

The results suggest that a thigh-worn accelerometer can monitor continuous walking in daily life in individuals with LSS. The thigh-worn accelerometer did not agree with the ankle-worn StepWatch on daily steps. Device type and wear-site should be considered when interpreting step data.