MedicalResearch.com Interview with:
Karin Magnusson PT, PhD
Associate ResearcherLund University and
Norwegian Institute of Public Health
MedicalResearch.com: What is the background for this study? Response: Anterior cruciate ligament (ACL) injury is one of the most common knee injuries, for which very limited data has been presented on the genetic contribution. Based on our knowledge of the role of genetics in the development of ACL-rupture related traits, such as joint hypermobility and knee osteoarthritis, we hypothesized that heritability might play a role also in ACL injury.
Using the Swedish Twin Registry, which is the world's largest twin registry and in this study including more than 88.000 twins, we had unique data to for the first time reliably estimate the heritability for this common knee injury.(more…)
MedicalResearch.com Interview with:
Mackenzie M. Herzog, MPH
PhD Candidate, Injury Epidemiology
The University of North Carolina at Chapel HillMedicalResearch.com: What is the background for this study?
Response: In 1999, a study by Arendt et al. reported that women were more likely to tear their ACL than men while playing the same sport. Since then, numerous studies have investigated this sex difference in ACL injury, and many prevention programs targeting youth athletes have been developed and tested. Although randomized trials have demonstrated the value of injury prevention programs in reducing the risk of ACL injury, the overall impact of these programs has not been examined in the general population. Our study investigated the net impact of research and prevention efforts over nearly 20 years in reducing ACL injuries by assessing time trends of ACL reconstruction, a consequence of ACL injury, among commercially-insured individuals in the United States.
MedicalResearch.com Interview with: Dr. Bruce Beynnon
McClure Professor of Musculoskeletal Research
Dept Orthopedics and Rehabilitation
University of Vermont College of Medicine
Burlington, VT 05405-0084
Medical Research: What are the main findings of the study?Dr. Beynnon: The anterior cruciate ligament (ACL) is an important stabilizer of the joint, and the study investigated how geometry of this ligament and surrounding bone is related to non-contact injury of this ligament. Specifically, the study focused on MRI-based measurements of the size of the ACL, measured as its volume, and the size of the femoral intercondylar notch, or the small space located in the center of the femur in which the ACL resides. Our study revealed that a decrease in the volume of the ACL and a decrease in the size of the intercondylar notch were associated with an increased risk of suffering a non-contact ACL injury in athletes.
This finding may be explained by the fact that a smaller ligament is associated with a decrease in its biomechanical properties, such as a smaller ultimate failure load. An alternative explanation is that a decreased femoral intercondylar notch size could result in a greater tendency for the ACL to impinge against the walls of the femoral notch during high demand activities, and increase the risk of injury.
The investigation was a longitudinal study with a nested case-control analysis of young, healthy high school and college athletes. The investigation was rigorously designed to control for age, sex, and participation on the same sports team. This enabled us to determine which combination of geometric parameters of the ACL and adjacent bony structures influence risk of suffering a first time non-contact ACL injury.
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