Marc F. Norcross, PhD, ATC
Assistant Professor
School of Biological & Population Health Sciences, Exercise & Sport Science Program
College of Public Health and Human Sciences
Oregon State University
Corvallis, OR 97331
MedicalResearch.com: What are the main findings of the study?Dr. Norcross: In the scientific community, there remains considerable disagreement over which direction of knee loading is most responsible for causing an anterior cruciate ligament (ACL) injury event. Many researchers tend to fall into one of three “camps” in which they believe quadriceps loading (sagittal plane), “knock-kneed” landing (frontal plane), or twisting (transverse plane) is the essential factor in the injury mechanism. However, we know from cadaver studies that combined loading from all of these different planes puts the most strain on the ACL. We found that men and women are equally likely to use a sagittal plane landing strategy that we believe increases the risk for ACL injury. However, females were about 3.6 times more likely than males to use a higher risk frontal plane landing strategy. This suggests that the increased likelihood of greater frontal plane loading in women coupled with the equal likelihood of using a high-risk sagittal plane strategy is likely at least partly responsible for women’s 2-6 times greater risk for ACL injury.
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MedicalResearch.com Interview with: Mark V. Paterno PT, PhD, MBA, SCS, ATC
Coordinator of Orthopaedic and Sports Physical Therapy
Associate Professor, Sports Medicine Biodynamics Center
Acting Scientific Director, Division of Occupational Therapy and Physical Therapy
Cincinnati Children's Hospital Medical Center
3333 Burnet Ave. MLC 10001
Cincinnati, OH 45229-3039
MedicalResearch.com: What are the main findings of the study?Dr. Paterno: Our study suggests that young patients (average age 16 y/o) who return to pivoting and cutting sports after Anterior cruciate ligament (ACL) reconstruction are 6 times more likely to suffer a second ACL injury than an individual with no prior history of ACL injury. In addition, females after ACL reconstruction may be more likely to injury their opposite limb than actually re-injure the same limb they initially hurt. Finally, when you look at the results of this 2 year outcome study in conjunction with the 1 year outcomes we published last year, it would appear that the greatest risk of suffering a second ACL injury is within the first several months after returning to sports.
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