Objectives
To assess the validity and reliability of the Six-Spot Step Test (SSST) in total hip arthroplasty (THA) patients.
Design
Cross-sectional cohort study.
Setting
Outpatient clinic.
Participants
Sixty-one patients at least six months post-primary THA.
Main outcome measures
The SSST was performed twice on the same day by Rater 1, along with the Timed Up and Go (TUG), Four-Square Step Test (FSST), and Berg Balance Scale (BBS). It was repeated 5–7 days later by Raters 1 and 2. Reliability was assessed using intraclass correlation coefficients (ICC) and Bland–Altman analysis; validity with Spearman’s correlation. A fall-risk cut-off was identified via receiver operating characteristic (ROC) analysis.
Results
Participants’ mean (SD) age was 64 (7) years, with an Oxford Hip Score of 37 (8). As defined by the Bland–Altman analysis, the agreement intervals, within which 95% of the differences of the second measurement, compared to the first one, fall were: within day −1.7 to 2.3 seconds (s), −2.3 to 2.0 seconds between day and −2.0 to 1.9 between raters. Reliability was excellent within-day (ICC: 0.95), between-day (ICC: 0.94), and inter-rater (ICC: 0.95). The SSST correlated strongly with the TUG (ρ = 0.70) and FSST (ρ = 0.81), and moderately with the BBS (ρ = −0.62). A cut-off of 10.7 seconds indicated fall risk (sensitivity: 75%; specificity: 73%; AUC = 0.82, 95% CI: 0.71–0.94, p < 0.001).
Conclusion
The SSST is a reliable and valid tool for assessing mobility in THA patients. It effectively identified fall risk in this sample, supporting its clinical use. However, further validation in different samples is required.
Clinical Trial Registration number
NCT06704217
Contribution of paper
- •The SSST is a reliable and valid tool for assessing functional mobility in patients after total hip arthroplasty.
- •A variation exceeding the 95% limits of agreement (−2.3 to 2.0 seconds) can be considered a true performance change.
- •SSST effectively identified fall risk in this sample, with a cutoff time of 10.7 seconds.
- •Strong correlations with established balance and mobility tests support SSST’s clinical utility.
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