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Journals / Turkish Journal of Kinesiology / 2026 / Volume: 12 Issue: 4

Dual-task performance after primary and revision total knee arthroplasty: Comparison of mobility and dynamic balance

Elif Aygun Polat(Department of Physiotherapy and Rehabilitation, Faculty of Health Sciences, Ordu University, Ordu, Türkiye.)0000-0001-9634-0728
Yunus Emre Özbilen(Department of Orthopedics and Traumatology, Faculty of Medicine, Ordu University, Ordu, Türkiye.)
Yusuf Polat(Department of Orthopedics and Traumatology, Faculty of Medicine, Ordu University, Ordu, Türkiye.)0000-0002-1650-9712
Pages
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Publication Date
2026-08-29
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

For TUG, the revision TKA group had poorer overall performance than the primary TKA group (p=0.029), but the condition-by-group interaction was not significant (p=0.799).

📌 3 Key Takeaways

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Objective & Hypothesis:This study aimed to compare functional mobility and dynamic balance under single-task and dual-task conditions in patients after primary total knee arthroplasty (TKA) and revision TKA, and to examine dual-task cost as an indicator of motor performance deterioration under cognitive load.
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Key Findings & Data:In this cross-sectional comparative study, 80 patients aged 55 years or older who had undergone primary TKA (n=40) or revision TKA (n=40) at least 12 months previously were evaluated.
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Conclusion & Impact:For TUG, the revision TKA group had poorer overall performance than the primary TKA group (p=0.029), but the condition-by-group interaction was not significant (p=0.799).
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Dual-task · dual-task cost · dynamic balance

Abstract

This study aimed to compare functional mobility and dynamic balance under single-task and dual-task conditions in patients after primary total knee arthroplasty (TKA) and revision TKA, and to examine dual-task cost as an indicator of motor performance deterioration under cognitive load. In this cross-sectional comparative study, 80 patients aged 55 years or older who had undergone primary TKA (n=40) or revision TKA (n=40) at least 12 months previously were evaluated. Functional mobility and dynamic balance were assessed using the Timed Up and Go (TUG) test and the Four Square Step Test (FSST) under single-task and dual-task conditions. Under dual-task conditions, participants simultaneously counted backward aloud by twos from a randomly selected number below 100. The revision TKA group showed worse unadjusted performance in single-task TUG (13.37±3.93 vs 11.64±2.13 s, p=0.017) and dual-task FSST (17.57±5.55 vs 14.86±3.94 s, p=0.014). After adjustment for age and sex, dual-tasking significantly worsened performance in both TUG and FSST (both p<0.001). For TUG, the revision TKA group had poorer overall performance than the primary TKA group (p=0.029), but the condition-by-group interaction was not significant (p=0.799). For FSST, both the between-group difference (p=0.033) and the condition-by-group interaction were significant (p=0.001), indicating a greater adverse effect of cognitive load in the revision TKA group. FSST dual-task cost was significantly higher in the revision TKA group than in the primary TKA group (16.39±13.82% vs 6.59±13.72%, p=0.002), whereas TUG dual-task cost did not differ significantly between groups (p=0.604). These findings suggest that dual-task multidirectional stepping may be more sensitive than general mobility testing for detecting residual functional deficits after revision TKA. Dual-task FSST may therefore be a useful clinical assessment tool for identifying persistent balance-related limitations after revision TKA.

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Cite This Article

Polat, E. A., Özbilen, Y. E., Polat, Y. (2026). Dual-task performance after primary and revision total knee arthroplasty: Comparison of mobility and dynamic balance. Turkish Journal of Kinesiology, Volume: 12 Issue: 4. https://doi.org/10.31459/turkjkin.1938084

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