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:5/24/2017)... ... 2017 , ... If you are thinking of a visit to San Francisco , fall ... the perfect time to visit. , Business Architecture Associates is pleased to offer 5 days ... as a 4-½ day package for individuals, and as 4-½ day corporate package for up ...
(Date:5/24/2017)... Chicago, IL (PRWEB) , ... May 24, 2017 ... ... of the most prominent for-profit and nonprofit hospitals and health systems in the ... have turned around their institutions, led professional organizations and been instrumental in developing ...
(Date:5/24/2017)... Shoreview, MN (PRWEB) , ... May 24, 2017 ... ... manufacturer of polyvinylidene fluoride (PVDF) based sleep diagnostics sensors, announced today it had ... network now consists of a mix of domestic and rest of world (ROW) ...
(Date:5/23/2017)... ... ... Allegheny Health Network and the Alexis Joy D’Achille Foundation ... at West Penn Hospital , a unique facility that will offer the most ... Construction of the Center is underway with a scheduled opening in the fall of ...
(Date:5/23/2017)... ... , ... New England Journal Of Medicine Confirms Viability of Rory’s Regulations and ... Staunton Foundation Calls on Health & Human Services, Tom Price to Adopt Rory’s Regulations ... today reported on a new study released on May 21, 2017 in the New ...
Breaking Medicine News(10 mins):
(Date:5/3/2017)... WAYNE, N.J. , May 3, 2017 /PRNewswire/ ... systems that contribute to quality enhancement and cost ... results from a study of contemporary practice demonstrating ... a first-line therapy for critically ill patients. The ... the Company,s newer large volume MEGA ® ...
(Date:5/2/2017)... YORK and LONDON , ... of market intelligence, MarketResearch.com is pleased to announce a ... AB that allows for the marketing and distribution ... analyses through the MarketResearch.com website. The new ... to complete product descriptions and tables of contents from ...
(Date:5/2/2017)... , May 2, 2017  CIVCO Radiotherapy, the ... solutions, announced today that Nat Geissel ... CIVCO since 2012 and has served as vice ... vice president and general manager, and most recently, ... "I am extremely proud of what CIVCO Radiotherapy ...
Breaking Medicine Technology: