Saturday, January 31, 2015

Examining ACL Injuries In Females

There are several theories as to why this may be the case, some of which may not be so obvious.

Examining ACL Injuries In Females

There are several theories as to why this may be the case, some of which may not be so obvious.
There are several theories as to why this may be the case, some of which may not be so obvious.


Since Title IX was signed into law by President Nixon in 1972, a dramatically increasing number of female athletes participate in sports not only at the collegiate level, but also at the high school and recreational levels as well. Currently, there are just as many young girls playing competitive sports as boys.
Title IX made it illegal for any educational program or activity that received federal financial assistance to discriminate on the basis of sex or gender, giving females an equal opportunity to participate in organized athletics.
Unfortunately, with increased participation comes an increase in injuries. Specifically, recent studies have shown that female athletes are up to 8-10 times as likely to sustain devastating knee injuries, such as an Anterior Cruciate Ligament (ACL) tear, compared to their male counterparts. There are several theories as to why this may be the case, some of which may not be so obvious:
Limb alignment
Evolutionarily, females tend to have wider pelvises compared to males for eventual child birth. This widening of the pelvis causes the knee alignment below it to be more “valgus” or knock-kneed. In addition, females are more likely to have rotational abnormalities of their femurs (thigh bones) and tibias (shin bones). During aggressive physical activities, these lower extremity limb alignment changes can place more force on the ACL than it can tolerate, making it susceptible to injury.
The major dynamic stabilizers of the knee during regular and aggressive physical activity are thequadriceps muscle group or thigh muscles. The particular muscles that athletes use to brace their knees when landing from a jump or hop are often weaker in females than in males, largely in part because of the differences in lower extremity alignment. In addition, the order in which the various quadriceps muscles fire or activate in female athletes is also different.
Fluctuating hormone levels—specifically estrogen and progesterone—in the female body can affect the biomechanics of the ACL tear. This can occur as a result of the menstrual cycle and exogenous hormone ingestion (birth control pills). Studies have shown that the strength of ligaments such as the ACL may be weakened by the presence of estrogen. In addition, other studies have suggested that ACL tears in female athletes are more likely in certain phases of the menstrual cycle.
ACL Anatomy
The actual ligament itself tends to be slightly smaller and thinner in females. Also, the intercondylar notch, or space at the end of the femur (thigh bone) where the ACL is located tends to be narrower.
Injury Prevention
The combination of these factors coupled with increased aggression, physical activity and competition makes it apparent why female athletes are more susceptible to ACL tears. Unfortunately, most of these factors are inherent to being female and are not modifiable. Prevention programs are centered on increasing muscle tone, balance, improving muscle firing, as well as maintaining flexibility, core and overall strength.


About this blog

Whether you are a weekend warrior, an aging baby boomer, a student athlete or just someone who wants to stay active, this blog is for you. Read about our growing list of expert contributors here.

J. Ryan Bair, PT, DPT, SCS Founder and Owner of FLASH Sports Physical Therapy, Board Certified in Sports Physical Therapy
Brian Cammarota, MEd, ATC, CSCS, CES Partner at Symetrix Sports Performance
Ellen Casey, MD Physician with Drexel University Sports Medicine
Desirea D. Caucci, PT, DPT, OCS Co-owner of Conshohocken Physical Therapy, Board Certified Orthopedic Clinical Specialist
Michael G. Ciccotti, M.D. Head Team Physician for Phillies & St. Joe's; Rothman Institute
Julie Coté, PT, MPT, OCS, COMT Magee Rehabilitation Hospital
Peter F. DeLuca, M.D. Head Team Physician for Eagles, Head Orthopedic Surgeon for Flyers; Rothman Institute
Joel H. Fish, Ph.D. Director of The Center For Sport Psychology; Sports Psychology Consultant for 76ers & Flyers
R. Robert Franks, D.O. Team Physician for USA Wrestling, Consultant for Phillies; Rothman Institute
Ashley B. Greenblatt, ACE-CPT Certified Personal Trainer, The Sporting Club at The Bellevue
Eugene Hong, MD, CAQSM, FAAFP Team Physician for Drexel, Philadelphia Univ., Saint Joe’s, & U.S. National Women’s Lacrosse
Julia Mayberry, M.D. Attending Hand & Upper Extremity Surgeon, Main Line Hand Surgery P.C.
Jim McCrossin, ATC Strength and Conditioning Coach, Flyers and Phantoms
Gavin McKay, NASM-CPT Founder/Franchisor, Unite Fitness
Kevin Miller Fitness Coach, Philadelphia Union
Heather Moore, PT, DPT, CKTP Owner of Total Performance Physical Therapy, North Wales and Hatfield, PA
Kelly O'Shea Senior Health Producer,
Tracey Romero Sports Medicine Editor,
David Rubenstein, M.D. Team Orthopedist for 76ers; Main Line Health Lankenau Medical Center
Robert Senior Event coverage, Sports Doc contributor
Justin Shaginaw, MPT, ATC Athletic Trainer for US Soccer Federation; Aria 3B Orthopaedic Institute
Thomas Trojian MD, CAQSM, FACSM Associate Chief of the Division of Sports Medicine at Drexel University
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