Context: People with chronic ankle instability (CAI) exhibit less weight-bearing dorsiflexion range of motion (ROM) and less knee flexion during landing than people with stable ankles. Examining the relationship between dorsiflexion ROM and landing biomechanics may identify a modifiable factor associated with altered kinematics and kinetics during landing tasks.Objective: To examine the relationship between weightbearing dorsiflexion ROM and single-legged landing biomechanics in persons with CAI.Design: Cross-sectional study. Setting: Laboratory.Patients or Other Participants: Fifteen physically active persons with CAI (5 men, 10 women; age ¼ 21.9 6 2.1 years, height ¼ 168.7 6 9.0 cm, mass ¼ 69.4 6 13.3 kg) participated.Intervention(s): Participants performed dorsiflexion ROM and single-legged landings from a 40-cm height. Sagittal-plane kinematics of the lower extremity and ground reaction forces (GRFs) were captured during landing.Main Outcome Measure(s): Static dorsiflexion was measured using the weight-bearing-lunge test. Kinematics of the ankle, knee, and hip were observed at initial contact, maximum angle, and sagittal displacement. Sagittal displacements of the ankle, knee, and hip were summed to examine overall sagittal displacement. Kinetic variables were maximum posterior and vertical GRFs normalized to body weight. We used Pearson product moment correlations to evaluate the relationships between dorsiflexion ROM and landing biomechanics. Correlations (r) were interpreted as weak (0.00-0.40), moderate (0.41-0.69), or strong (0.70-1.00). The coefficient of determination (r 2 ) was used to determine the amount of explained variance among variables.Results: Static dorsiflexion ROM was moderately correlated with maximum dorsiflexion (r ¼ 0. Key Words: ankle sprain, drop landing, neuromuscular control, kinematics, kinetics Key PointsDuring a single-legged landing, persons with chronic ankle instability demonstrated moderate to strong relationships between dorsiflexion range of motion (ROM) and sagittal-plane kinematics at the knee and hip and vertical ground reaction forces. Persons with less dorsiflexion ROM exhibited a less flexed landing strategy that attenuated ground reaction forces less efficiently. Identifying dorsiflexion deficits may enable clinicians to implement interventions to increase ROM and potentially modify the landing biomechanics that persons with chronic ankle instability exhibit.
Objective To conduct a systematic review with meta-analysis assessing the effectiveness of joint mobilizations for improving dorsiflexion range of motion (DFROM) and dynamic postural control in individuals with chronic ankle instability. Data Sources Electronic databases (PubMed, MEDLINE, CINAHL, and SPORTDiscus) were searched from inception to January 2017. Study Selection Included studies examined the isolated effects of joint mobilizations to enhance DFROM and dynamic postural control in individuals with chronic ankle instability and provided adequate data to calculate effect sizes (ESs) and 95% confidence intervals (CIs). Data Extraction Two investigators independently assessed the methodologic quality, level of evidence, and strength of recommendation using the Physiotherapy Evidence Database scale and the Strength of Recommendation Taxonomy. We extracted the sample sizes, means, and standard deviations for DFROM and dynamic postural control and filtered the data based on control-to-intervention and preintervention-to-postintervention (pre-post) comparisons. Data Synthesis We included 7 level 1 and 3 level 2 studies that had a median Physiotherapy Evidence Database score of 60% (range = 40%–80%). The magnitudes of control-to-intervention and pre-post differences were examined using bias-corrected Hedges g ESs. Random-effects meta-analyses were conducted for each outcome measure and comparison. Positive ESs indicated better outcome scores in the intervention group than in the control group and at postintervention than at preintervention. The α level was set at .05. Meta-analysis revealed weak and moderate ESs for overall control-to-intervention (ES = 0.41; 95% CI = 0.14, 0.68; P = .003) and pre-post (ES = 0.34; 95% CI = 0.20, 0.48; P < .001) DFROM analyses. Overall, dynamic postural control meta-analysis revealed moderate control-to-intervention (ES = 0.42; 95% CI = −0.14, 0.98; P = .14) and weak and moderate ESs for pre-post (ES = 0.37; 95% CI = −0.12, 0.87; P = .14) analyses. Conclusions We observed grade A evidence that joint mobilizations can mildly improve DFROM among individuals with chronic ankle instability compared with controls and preintervention. We observed grade B evidence that indicated conflicting effects of joint mobilizations on dynamic postural control compared with controls and preintervention.
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