Document Detail

Decreased quadriceps activation measured hours prior to a noncontact anterior cruciate ligament tear.
MedLine Citation:
PMID:  18678959     Owner:  NLM     Status:  MEDLINE    
STUDY DESIGN: Case report. BACKGROUND: Decreased quadriceps activation has been shown to be present following anterior cruciate ligament (ACL) injury, but its presence prior to ACL injury is unknown. The purpose of this case report was to describe the level of quadriceps activation measured hours before a noncontact ACL injury in an individual who previously demonstrated known biomechanical risk factors for ACL injury. CASE DESCRIPTION: A 23-year-old female (height, 176.9 cm; mass, 72.4 kg), sustained a left noncontact ACL injury while landing from a jump stop during a recreational basketball game. This case was unique because data regarding landing biomechanics and quadriceps force and activation were gathered in 2 separate, unrelated studies prior to injury. OUTCOMES: Peak external knee abduction moment (-65.3 Nm) during a drop jump landing 8 months prior to injury indicated elevated risk for ACL injury. Involved quadriceps central activation ratios (CAR) were obtained 1 week (CAR, 0.81) and 4 hours (CAR, 0.77) prior to injury. Strength and CAR (0.76) measurements changed very little within 36 hours of injury and both strength, and activation (CAR, 0.90) improved following surgical reconstruction and formal rehabilitation. DISCUSSION: An individual with known biomechanical risk factors for ACL injury may compound risk for noncontact ACL injury if decreased quadriceps activation is also present. LEVEL OF EVIDENCE: Prognosis, level 4.
Terry L Grindstaff; Kate R Jackson; J Craig Garrison; David R Diduch; Christopher D Ingersoll
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Publication Detail:
Type:  Case Reports; Journal Article     Date:  2008-08-01
Journal Detail:
Title:  The Journal of orthopaedic and sports physical therapy     Volume:  38     ISSN:  0190-6011     ISO Abbreviation:  J Orthop Sports Phys Ther     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-05     Completed Date:  2008-12-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7908150     Medline TA:  J Orthop Sports Phys Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  508-16     Citation Subset:  IM    
University of Virginia, Charlottesville, VA 22903, USA.
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MeSH Terms
Anterior Cruciate Ligament / injuries*
Hip Joint / physiopathology
Isometric Contraction / physiology
Knee Injuries / physiopathology*
Knee Joint / physiopathology
Muscle, Skeletal / physiopathology*
Thigh / physiopathology
Young Adult

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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