Navigation Links
Muscle patterns in women may be linked to at risk positioning for ACL tears
Date:9/18/2007

ANN ARBOR, Mich.---Research suggests that training programs for females to restore balance between hamstring and quadriceps muscles to better support knee joints could help reduce the disproportionately high number of ACL tears in female athletes.

A new study shows that the amount of preparatory muscle action in the muscles spanning the knee joint prior to landings is associated with knee positions that are considered at risk for ACL rupture, said Riann Palmieri-Smith, lead author and assistant professor at the University of Michigan Division of Kinesiology.

The ACL is one of the four major ligaments of the knee, and women are 2-8 times more likely to tear this ligament than men are while playing the same sport, said Palmieri-Smith.

The U-M research suggests that training programs which promote balanced activity of the inner (medial) and outer (lateral) thigh muscles might help protect the ACL.

This preparatory muscle action helps to control the relationship of the shank relative to the thigh. When the shin bone is positioned outward compared to the thigh bone, it results in a knock-kneed posture, Palmieri-Smith said. This position is referred to as knee valgus, and increased knee valgus (more knock kneed) has been shown to be linked to ACL injury risk, said Palmieri-Smith, who is also affiliated with U-M's new Sport Injury Prevention Center.

Think of a person who jumps and lands with knock knees (knees turned in) as opposed to a person who lands with minimal or no side-to-side angle at the knee (thigh and shank aligned). The person who lands with their knees turned in too much appears, based on previous research, to be more likely to tear their ACL.

The U-M study showed that when women are preparing to land from a jump they tend to activate the muscles of the outer (lateral) thigh more than the muscles of their inner (medial) thigh, and that this pattern of muscle activity was associated with a larger valgus knee angle, Palmieri-Smith said. The results of the study are important because as scientists establish a relationship between preparatory muscle activity and at risk ACL knee positions, they may be able to develop training regimens to help train muscles to behave differently and better support the knees. "The question is can we train these muscles to be more balanced, to really lower valgus knee angle" We want to restore lateral and medial balance," Palmieri-Smith said.

ACL injuries have long lasting and damaging affects in both the short and long term, Palmieri-Smith said. Evidence suggests that up to 70 percent of successfully treated ACL tears will develop osteoarthritis within five to 14 years.

In the study, researchers fitted 11 women and 10 men with electrodes to monitor muscle activity and markers to monitor knee joint position while they jumped on a force platform that collected ground reaction force data.


'/>"/>

Contact: Laura Bailey
baileylm@umich.edu
734-647-1848
University of Michigan
Source:Eurekalert

Related medicine news :

1. Mushroom and muscle loss
2. Blood Pressure Drugs maintain muscle strength
3. New treatment for muscle spasms
4. Protein can change worn muscle fibres
5. Stretching the muscles doesnt make them more resilient
6. Protein said to Improve Muscle Loss
7. ‘Protein’ Produced By Overstressed Heart Muscle a Strong Indicator Of Heart Diseae
8. Regeneration of muscle
9. Protein Found To Improve Muscle Loss
10. Strong Pelvic Muscles Found To Facilitate Childbirth
11. Molecule responsible for muscle repair identified
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/27/2016)... ... , ... TherapySites, the leading website and online ... Counseling Association. This new relationship allows TherapySites to continue to extend their ... benefits and promotional offers. , "TCA is extremely excited about this new partnership, ...
(Date:6/26/2016)... ... June 26, 2016 , ... On June 10-11, 2016, ... the 2016 Cereal Festival and World’s Longest Breakfast Table in Battle Creek, MI, where ... city’s history as home to some of the world’s leading providers of cereal and ...
(Date:6/25/2016)... (PRWEB) , ... June 25, 2016 , ... ... health policy issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, ... work on several important health care topics including advance care planning, healthcare costs ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, Dr. Omkar ... M.D from the David Geffen School of Medicine at UCLA. He trained in Internal ... complete his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where he had ...
(Date:6/24/2016)... ... ... Those who have experienced traumatic events may suffer from a complex set of ... or alcohol abuse, as a coping mechanism. To avoid this pain and suffering, Serenity ... event. , Trauma sufferers tend to feel a range of emotions, from depression, guilt, ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... , , , WHEN: , , ... , , , LOCATION: , , , Online, with free registration ... PANELISTS:  , , , Frost & Sullivan,s Global Vice President of ... Analyst, Divyaa Ravishankar and Unmesh Lal, Program Manager , ... witnessing an exceptional era. Several new demand spaces, such as innovative ...
(Date:6/23/2016)... Revolutionary technology includes multi-speaker listening ... industry leaders in advanced audiology and hearing aid technology, ... ™, the world,s first internet connected hearing aid that ...      (Photo: http://photos.prnewswire.com/prnh/20160622/382240 ) , ... ,world firsts,: , TwinLink™ - the first ...
(Date:6/23/2016)... , June 23, 2016 ... "Surgical Procedure Volumes: Global Analysis (United States, China, ... Canada)" report to their offering. ... essential tool for healthcare business planners, provides surgical procedure ... at surgery trends with an in-depth analysis of growth ...
Breaking Medicine Technology: