Roger O Kollock1, Corey Andrews2, Ashlyn Johnston2, Teresa Elliott2, Alan E Wilson3, Kenneth E Games4, JoEllen M Sefton5. 1. Department of Kinesiology and Rehabilitative Sciences, University of Tulsa, OK. 2. Athletic Training Post-Certification Graduate Program, Auburn University, AL. 3. School of Fisheries, Aquaculture, and Aquatic Sciences, Auburn University, AL. 4. Department of Applied Medicine and Rehabilitation, Indiana State University. 5. Warrior Research Center, School of Kinesiology, Auburn University, AL.
Abstract
CONTEXT: Knee overuse injuries are the most common musculoskeletal complaints in military trainees and are common in active-duty warfighters. Muscle strengthening is usually recommended; however, research is conflicting in this area, which makes it difficult to develop effective screening, prevention, and training interventions for warfighters. OBJECTIVE: To determine if lower extremity muscular weakness contributes to knee overuse injuries and identify specific muscular involvement. DATA SOURCES: We searched MEDLINE, PubMed, Web of Science, SPORTDiscus, CINAHL, and Military & Government Collection and reference lists of relevant articles published between January 1, 2000, and January 1, 2013. STUDY SELECTION: For inclusion, requirements were uninjured and injured groups; provision of the sample size, means, and standard deviations for all groups; identification of the specific muscles assessed; and clearly defined knee injury. DATA EXTRACTION: Sample size, sex, and muscle strength means and standard deviations. DATA SYNTHESIS: Twenty-five studies met these criteria. We used the Scottish Intercollegiate Guidelines Network algorithm to determine the appropriate tool for appraising article quality. Unweighted random-effects model meta-analyses were conducted. Separate meta-analyses were performed for the moderators of strength measurement scale (absolute or normalized muscle strength), muscle group, and sex. A weighted random-effects model with a Hedges g effect metric and 95% confidence intervals were used for comparison across studies. CONCLUSIONS: Our meta-analysis suggests that individuals with symptoms of a knee overuse injury have lower absolute and normalized hip muscle strength. Specifically, they had lower absolute hip external-rotator, knee-extensor, and knee-flexor strength, as well as lower normalized hip external-rotator, hip-extensor, and hip-abductor strength, compared with asymptomatic control participants. The findings suggest a possible link between lower hip and thigh strength and knee overuse injuries. Further research is needed to determine if weakness is a cause or a result of knee overuse injuries before screening and intervention can be developed for at-risk warfighters.
CONTEXT: Knee overuse injuries are the most common musculoskeletal complaints in military trainees and are common in active-duty warfighters. Muscle strengthening is usually recommended; however, research is conflicting in this area, which makes it difficult to develop effective screening, prevention, and training interventions for warfighters. OBJECTIVE: To determine if lower extremity muscular weakness contributes to knee overuse injuries and identify specific muscular involvement. DATA SOURCES: We searched MEDLINE, PubMed, Web of Science, SPORTDiscus, CINAHL, and Military & Government Collection and reference lists of relevant articles published between January 1, 2000, and January 1, 2013. STUDY SELECTION: For inclusion, requirements were uninjured and injured groups; provision of the sample size, means, and standard deviations for all groups; identification of the specific muscles assessed; and clearly defined knee injury. DATA EXTRACTION: Sample size, sex, and muscle strength means and standard deviations. DATA SYNTHESIS: Twenty-five studies met these criteria. We used the Scottish Intercollegiate Guidelines Network algorithm to determine the appropriate tool for appraising article quality. Unweighted random-effects model meta-analyses were conducted. Separate meta-analyses were performed for the moderators of strength measurement scale (absolute or normalized muscle strength), muscle group, and sex. A weighted random-effects model with a Hedges g effect metric and 95% confidence intervals were used for comparison across studies. CONCLUSIONS: Our meta-analysis suggests that individuals with symptoms of a knee overuse injury have lower absolute and normalized hip muscle strength. Specifically, they had lower absolute hip external-rotator, knee-extensor, and knee-flexor strength, as well as lower normalized hip external-rotator, hip-extensor, and hip-abductor strength, compared with asymptomatic control participants. The findings suggest a possible link between lower hip and thigh strength and knee overuse injuries. Further research is needed to determine if weakness is a cause or a result of knee overuse injuries before screening and intervention can be developed for at-risk warfighters.
Entities:
Keywords:
hip strength; iliotibial band syndrome; patellofemoral pain syndrome; warfighters
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