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. 2020 Oct 22;13(1):495.
doi: 10.1186/s13104-020-05295-9.

Reliability and minimal detectable change of the 'Imperial Spine' marker set for the evaluation of spinal and lower limb kinematics in adults

J A Deane  1 , E Papi  2 , A T M Phillips  3 , A H McGregor  2
Affiliations

Reliability and minimal detectable change of the 'Imperial Spine' marker set for the evaluation of spinal and lower limb kinematics in adults

J A Deane et al. BMC Res Notes. .

Abstract

Objectives: As a step towards the comprehensive evaluation of movement in patients with low back pain, the aim of this study is to design a marker set (three rigid segment spine, pelvic and lower limb model) and evaluate the reliability and minimal detectable change (MDC) of this marker set in healthy adults during gait and sit to stand (STS) tasks using three dimensional motion capture.

Results: The 'Imperial Spine' marker set was used to assess relative peak angles during gait and STS tasks using the minimum recommended sample size (n = 10) for reliability studies with minimum Intraclass Correlation Coefficient (ICC) of 0.70, optimum ICC 0.90 and 9 trials replicated per subject per task. Intra- and inter-tester reliability between an experienced and inexperienced user was examined. ICC, mean, standard error (SEM), Bland Altman 95% limits of agreement (LOA) and MDC were computed. ICC values demonstrated excellent intra- and inter-tester reliability in both tasks, particularly in the sagittal plane (majority ICCs > 0.80). SEM measurements were lower in gait (0.8-5.5°) than STS tasks (1°-12.6°) as were MDC values. LOA demonstrated good agreement. The 'Imperial Spine' marker set is reliable for use in healthy adults during functional tasks. Future evaluation in patients is required.

Keywords: Gait; Kinematics; Low back pain; Marker set; Minimal detectable change; Motion technology; Reliability; Sit to stand; Spine; Three dimensional motion capture.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
The ‘Imperial Spine’ marker set, segments and local anatomical frames. For all local anatomical frames, the + y axis (cephalad) is indicated in green, the + z axis (towards the right) in blue and the + x axis (perpendicular to both + y and + z axes) in red
See this image and copyright information in PMC

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