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- Title
Effect of limited dorsiflexion range of motion on the outcome of the clinical balance test in individuals with chronic ankle instability.
- Authors
Shojiro Nozu; Tadamitsu Matsuda; Yuji Takazawa
- Abstract
People with chronic ankle instability (CAI) demonstrate limited dorsiflexion range of motion (DFROM), leading to altered postural control. Moreover, CAI exhibits diminished posteromedial (PM) reach distance of the Star Excursion Balance Test (PM-SEBT), compared to healthy people. However, whether DFROM limitation affects PM-SEBT is unknown. Purpose: This study aimed to examine whether DFROM was a covariance between PM-SEBT outcomes in individuals with and without CAI. We hypothesized that DFROM affects PM reach distance. Study design: A cross-sectional study including 20 uninjured people and 15 patients with CAI was conducted. Participants performed the weight-bearing lunge test (WBLT) and PM-SEBT. We measured the DFROM during WBLT, maximum reach distance (MRD), and lower-limb sagittal joint angles with electromyographic signals from the tibialis anterior (TA) and soleus during the PM-SEBT. All biomechanical parameters at the maximum reach point were included in the statistical analysis. We used an independent t-test to compare all variables between the control and CAI groups. Analysis of covariance (ANCOVA) was used to compare MRD between the groups while adjusting for DFROM. Significance was set at p<0.05. Results: The CAI group exhibited shorter MRD (p=0.005), limited DFROM (p=0.01), less knee flexion (p=0.04), and lower TA muscle activity (p=0.008), compared to the control group. ANCOVA demonstrated that DFROM, knee flexion, and TA muscle activity were not covariates for the comparison of MRD between the control and CAI groups (p=0.24, 0.09, 0.98, respectively). Conclusion: This study suggested that limited DFROM did not affect PM reach distance. Clinicians should consider altered postu- ral control in people with CAI, compared to healthy people, while conducting the PM-SEBT to assess their dynamic balance ability. Future studies should employ multivariate analysis to clarify how people with CAI control their movements during the PM-SEBT.
- Subjects
NORWAY; DORSIFLEXION; CONFERENCES &; conventions; ANKLE joint; RANGE of motion of joints; POSTURAL balance
- Publication
International Journal of Sports Physical Therapy, 2024, Vol 19, Issue 6, p775
- ISSN
2159-2896
- Publication type
Article