Title | Prediction of Dynamic Postural Stability During Single-Leg Jump Landings by Ankle and Knee Flexibility and Strength. |
Publication Type | Journal Article |
Year of Publication | 2016 |
Authors | Williams VJ, Nagai T, Sell TC, Abt JP, Rowe RS, McGrail MA, Lephart SM |
Journal | J Sport Rehabil |
Volume | 25 |
Issue | 3 |
Pagination | 266-72 |
Date Published | 2016 Aug |
ISSN | 1543-3072 |
Keywords | Adult, Ankle Joint, Biomechanical Phenomena, Cross-Sectional Studies, Hip Joint, Humans, Knee Joint, Linear Models, Male, Movement, Muscle Strength, Muscle Strength Dynamometer, Muscle, Skeletal, Postural Balance, Range of Motion, Articular, Thorax |
Abstract | CONTEXT: Dynamic postural stability is important for injury prevention, but little is known about how lower-extremity musculoskeletal characteristics (range of motion [ROM] and strength) contribute to dynamic postural stability. Knowing which modifiable physical characteristics predict dynamic postural stability can help direct rehabilitation and injury-prevention programs. OBJECTIVE: To determine if trunk, hip, knee, and ankle flexibility and strength variables are significant predictors of dynamic postural stability during single-leg jump landings. DESIGN: Cross-sectional study. SETTING: Laboratory. PARTICIPANTS: 94 male soldiers (age 28.2 ± 6.2 y, height 176.5 ± 2.6 cm, weight 83.7 ± 26.0 kg). INTERVENTION: None. MAIN OUTCOME MEASURES: Ankle-dorsiflexion and plantar-flexion ROM were assessed with a goniometer. Trunk, hip, knee, and ankle strength were assessed with an isokinetic dynamometer or handheld dynamometer. The Dynamic Postural Stability Index (DPSI) was used to quantify postural stability. Simple linear and backward stepwise-regression analyses were used to identify which physical characteristic variables were significant predictors of DPSI. RESULTS: Simple linear-regression analysis revealed that individually, no variables were significant predictors of the DPSI. Stepwise backward-regression analysis revealed that ankle-dorsiflexion flexibility, ankle-inversion and -eversion strength, and knee-flexion and -extension strength were significant predictors of the DPSI (R2 = .19, P = .0016, adjusted R2 = .15). CONCLUSION: Ankle-dorsiflexion ROM, ankle-inversion and -eversion strength, and knee-flexion and -extension strength were identified as significant predictors of dynamic postural stability, explaining a small amount of the variance in the DPSI. |
DOI | |
Alternate Journal | J Sport Rehabil |
PubMed ID | 26356144 |