Dynamic Leap and Balance Test (DLBT): Ability to Discriminate Balance Deficits in Individuals with Chronic Ankle Instability.

CONTEXT:: The Dynamic Leap Balance Test (DLBT) is a new dynamic balance task that requires serial changes in base of support (BOS) with alternating limb support and recovery of dynamic stability, as compared to the Y modification of the Star Excursion Balance Test (Y-SEBT), which assesses dynamic stability over an unchanging BOS.

OBJECTIVES:: To assess the dynamic balance performance in two different types of dynamic balance tasks, the DLBT and the SEBT, in subjects with unilateral chronic ankle instability (CAI) when compared with healthy. We hypothesized that the DLBT score would significantly differ between the CAI involved and uninvolved limbs (contralateral and healthy matched) and demonstrate a modest (r=.50) association with the SEBT scores.

DESIGN:: Case-control.

SETTING:: Controlled Laboratory.

PARTICIPANTS:: Thirty-six physically-active adults, 18 with history of unilateral CAI and 18 without history of ankle injury were enrolled in the study. CAI subjects were identified using the Identification of Functional Ankle Instability (IdFAI) questionnaire.

INTERVENTIONS:: The DLBT and the SEBT were performed in a randomized order on a randomly selected limb in CAI and healthy subjects.

MAIN OUTCOMES:: Time taken to complete the DLBT and the reach distances performed on the SEBT were compared between the CAI and the healthy.

RESULTS:: There were no statistically significant differences (P < 0.05) in reach distances between groups. The DLBT time was greater (P<.01) for unstable ankles compared to the stable ankle. We found no correlation (P>0.05) between DLBT time and any of the SEBT reach distances suggesting that the DLBT provides unique information in the assessment of patients with CAI.

CONCLUSION:: The DLBT challenges the ability to maintain the postural control in CAI subjects differently than the SEBT. There is a need of more dynamic balance assessment tools that are functional and clinically relevant.