Gait assessment in shaped pathways: The test-retest reliability and concurrent validity of the figure of eight test and L test in multiple sclerosis patients without mobility aids

Abstract

Purpose: To our knowledge, no other studies have demonstrated the reliability and validity of the Figure of Eight Walking Test (F8WT) and L Test in patients with multiple sclerosis (MS). The aim of the study was to prove the test-retest reliability and concurrent validity of the F8WT and L Test in patients with MS. Methods: A cross-sectional study was conducted with 52 patients with MS. A clinical neurologist evaluated patients by Expanded Disability Status Scale (EDSS). Participants completed the F8WT, L Test, Timed Up and Go Test (TUG), and Timed 25-Foot Walk Test (T25FW) in the first assessment session. Then, the F8WT and L Test was retested one hour later. The same evaluator completed all of the assessments. Results: The ICC of both tests were excellent (ICCF8WT: 0.972, ICCL Test: 0.986). F8WT and L test measurement did not show a systematic bias and were within the agreement limits. The Standard Error of Measurement (SEM95) and Minimal Detectable Change (MDC95) values of the F8WT was 0.58 and 1.60, respectively. Besides, L Test's SEM95 and MDC95 were 0.59 and 1.63. The correlation between F8WT with TUG, T25FW and EDSS was 0.849, 0.810 and 0.453. On the other hand, the L test's correlation coefficient with TUG, T25FW and EDSS 0.682, 0.706 and 0.535, respectively (p < 0.01). Individuals with “EDSS ≤ 1″ had statistically significantly better L-test and F8WT scores than those with “EDSS: 1 to 4.5″ (p < 0.01). Conclusion: F8WT and L Test is a valid and reliable physical performance test in MS patients without mobility aids. Both tests demonstrate advanced gait assessment in L and 8 shaped pathways to provide more comprehensive evaluation than horizontal pathways.