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Updated: Jan 23, 2026

Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
Reliability of the Modified Four Square Step Test (mFSST) in patients with primary total knee arthroplasty
Bayram Unver1, Kevser Sevik1, Haci Ahmet Yarar1
1School of Physical Therapy and Rehabilitation, Dokuz Eylul University, Izmir, Turkey.
Abstract:
Purpose: The aim of the present study was to determine the test-retest reliability of the modified four square step test (mFSST) in patients with primary total knee arthroplasty (TKA).Methods: Twenty-eight patients with primary TKA were included in this study. Patients performed two mFSST trials on the same day.Results: The mFSST showed excellent test-retest reliability in this study. Intraclass correlation coefficient [ICC(2,1)] for FSST was 0.97. Standard error of measurement and smallest real difference at the 95% confidence level for mFSST were 0.80 and 2.24, respectively.Conclusions: The mFSST has an excellent test-retest reliability in patients with primary TKA. It is an effective and reliable tool for measuring dynamic balance and mobility in patients with primary TKA. As a clinical test, the mFSST is easy to score, quick to administer, requires little space, has no cost and needs no special equipment.
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