The purpose of this study was to compare the injured versus noninjured lower extremity on three single-leg hop tests following inversion ankle sprain. Twenty-two subjects with a history of unilateral inversion ankle sprain participated in this study. Subjects performed the three single-leg hop tests (hop for distance, hop for time, and agility hop). An independent t test was used to compare extremities. No significant differences existed on any hop test for the 22 subjects. In 8 of the 22 subjects who reported pain with activities of daily living and/or sports activities, an independent t test revealed no significant difference on hop test performance between extremities. We conclude that these three single-leg hop tests lack sensitivity (validity) in detecting lower extremity performance deficits as reported by the subjects following inversion ankle sprain.
Teddy W. Worrell, Laurie D. Booher and Karla M. Hench
Laurie D. Booher, Karla M. Hench, Teddy W. Worrell and Jill Stikeleather
Traditionally, lower extremity strength assessment has been performed in an open kinetic chain. Several authors, however, recommend closed kinetic chain assessment of lower extremity performance. Reliability of closed kinetic chain tests is not available. Therefore, the purpose of this study was to determine the reliability of the following single-leg hop tests: hop for distance, 6-m hop for time, and 30-m agility hop. Eighteen subjects (4 males and 14 females) participated in this study. An ANOVA repeated measures analysis revealed significant differences between the test trials within and between sessions for all dependent variables. However, when the mean of two test trials was analyzed, the three single-leg hop tests values were stable, that is, intraclass correlation coefficient (ICC 2,1) ranged from 0.77 to 0.99. Results demonstrate that these three single-leg hop tests were reliable as used in this study. Future research is needed to determine the sensitivity of these tests in the assessment of lower extremity performance following injury and following rehabilitation procedures.