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The purposes of this study were to determine test-retest reliability of the one-leg hop test when using hop distances (cm) and the hop index (distance hopped on the involved leg divided by the distance hopped on the noninvolved leg x 100) as criterion measurements and to compare two-data analysis strategies (the mean of three hops vs. the longest hop). Twenty-two men and 16 women who had undergone anterior cruciate ligament (ACL) reconstruction (mean time between surgery and testing 22 ± 7 years) performed the one-leg hop test on two occasions within a 2 week period. Test-retest reliability, determined using intraclass correlation coefficients (ICCs) (Type 2,1), was acceptable (ICCs > 0.75). Although hop distances calculated using the longest hop were significantly greater than those determined using the mean of three hops (p < 0.01), hop indexes were not affected by data analysis strategy. The clinical significance of these findings is that when the one-leg hop test is used to assess patients with ACL reconstruction, reliable hop distances and hop index scores can be produced on one test occasion.
Kramer et al. (Thu,) studied this question.