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Observational Study
. 2015 Aug;30(7):732-7.
doi: 10.1016/j.clinbiomech.2015.04.013. Epub 2015 May 9.

Measuring movement symmetry using tibial-mounted accelerometers for people recovering from total knee arthroplasty

Cory L Christiansen  1 , Michael J Bade  2 , Roger J Paxton  3 , Jennifer E Stevens-Lapsley  1
Affiliations
Observational Study

Measuring movement symmetry using tibial-mounted accelerometers for people recovering from total knee arthroplasty

Cory L Christiansen et al. Clin Biomech (Bristol). 2015 Aug.

Abstract

Background: The purpose of this investigation was to examine movement symmetry changes over the first 26weeks following unilateral total knee arthroplasty in community environments using skin-mounted tibial accelerometers. Comparisons to healthy participants of similar age were also made.

Methods: Patients (N=24) with unilateral knee osteoarthritis (mean (SD), 65.2 (9.2) years) scheduled to undergo total knee arthroplasty and a control group (N=19 healthy people; mean (SD), 61.3 (9.2) years) were recruited. The total knee arthroplasty group participated in a standardized course of physical rehabilitation. Tibial acceleration data were recorded during a Stair Climb Test and 6-Minute Walk Test. Tibial acceleration data were reduced to initial peak acceleration for each step. An inter-limb absolute symmetry index of tibial initial peak acceleration values was calculated.

Findings: The total knee arthroplasty group had greater between limb asymmetry for tibial initial peak acceleration and initial peak acceleration absolute symmetry index values five weeks after total knee arthroplasty, during the Stair Climb Test and the 6-Minute Walk Test.

Interpretation: Tibial accelerometry is a potential tool for measuring movement symmetry following unilateral total knee arthroplasty in clinical and community environments. Accelerometer-based symmetry outcomes follow patterns similar to published measures of limb loading recorded in laboratory settings.

Keywords: Accelerometer; Community environment; Movement symmetry; Total knee arthroplasty.

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Figures

Figure 1
Figure 1
Accelerometers attached to the tibia.
Figure 2
Figure 2
Participant performing Stair Climb Test with accelerometers attached to the tibia.
Figure 3
Figure 3
Instantaneous Peak Acceleration Absolute Symmetry Index Values Across all Time Points. Abbreviations: SCT, Stair Climb Test; 6MWT, Six-Minute Walk Test; CTL, Control group; TKA, Total Knee Arthroplasty group; PRE, Pre-operative time point; 5W, Five Week time point; 24W, 24 Week time point. * difference from pre-operative measurement for TKA group, P<0.05; † difference between TKA group and CTL group.
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