Two- and 3-Dimensional Knee Valgus Are Reduced After an Exercise Intervention in Young Adults With Demonstrable Valgus During Squatting
| Autor: | Darin A. Padua, David R. Bell, Micheal A. Clark, D. Craig Oates |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
musculoskeletal diseases
Adult Male medicine.medical_specialty Knee Joint Movement Anterior cruciate ligament Posture Physical Therapy Sports Therapy and Rehabilitation Context (language use) Young Adult Physical medicine and rehabilitation Humans Medicine Orthopedics and Sports Medicine Displacement (orthopedic surgery) Range of Motion Articular Young adult Original Research Analysis of Variance Exercise intervention biology business.industry General Medicine musculoskeletal system biology.organism_classification Exercise Therapy body regions Valgus medicine.anatomical_structure Physical therapy Squatting position Female Hip Joint Range of motion business human activities Ankle Joint |
| Zdroj: | Journal of Athletic Training. 48:442-449 |
| ISSN: | 1062-6050 |
| DOI: | 10.4085/1062-6050-48.3.16 |
| Popis: | Context: Two-dimensional (or medial knee displacement [MKD]) and 3-dimensional (3D) knee valgus are theorized to contribute to anterior cruciate ligament injuries. However, whether these displacements can be improved in the double-legged squat (DLS) after an exercise intervention is unclear. Objective: To determine if MKD and 3D knee valgus are improved in a DLS after an exercise intervention. Design: Randomized controlled clinical trial. Setting: Research laboratory. Patients or Other Participants: A total of 32 participants were enrolled in this study and were randomly assigned to the control (n = 16) or intervention (n = 16) group. During a DLS, all participants demonstrated knee valgus that was corrected with a heel lift. Intervention(s): The intervention group completed 10 sessions of directed exercise that focused on hip and ankle strength and flexibility over a 2- to 3-week period. Main Outcome Measure(s): We assessed MKD and 3D knee valgus during the DLS using an electromagnetic tracking system. Hip strength and ankle-dorsiflexion range of motion were measured. Change scores were calculated for MKD and 3D valgus at 0%, 10%, 20%, 30%, 40%, and 50% phases, and group (2 levels)-by phase (6 levels) repeated-measures analyses of variance were conducted. Independent t tests were used to compare change scores in other variables (α < .05). Results: The MKD decreased from 20% to 50% of the DLS (P = .02) and 3D knee valgus improved from 30% to 50% of the squat phase (P = .001). Ankle-dorsiflexion range of motion (knee extended) increased in the intervention group (P = .009). No other significant findings were observed (P > .05). Conclusions: The intervention reduced MKD and 3D knee valgus during a DLS. The intervention also increased ankle range of motion. Our inclusion criteria might have limited our ability to observe changes in hip strength. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|