Navigation Links
Muscle patterns in women may be linked to at risk positioning for ACL tears

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
University of Michigan

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:
(Date:11/25/2015)... ... November 25, 2015 , ... For the first time, Vitalalert ... Organizations, One Beat ” campaign. The partnership between the two groups began in 2014 ... MAP International’s cause. , MAP International was founded in 1954 and is an international ...
(Date:11/25/2015)... ... ... On November 25, 2015, officials of Narconon Arrowhead , the drug rehabilitation ... new cutting edge recovery program that has been 50 years in the making. ... with the purpose to free addicts from the symptoms and negative behaviors of addiction. ...
(Date:11/25/2015)... ... ... Smiles by Stevens is pleased to announce the addition of Botox® for ... aware of the benefits of Botox® in the treatment of moderate facial wrinkling, few ... and pain as a result of Jaw Tension, TMJ (temporo-mandibular joint) disorder, and Bruxism ...
(Date:11/25/2015)... ... November 25, 2015 , ... In an ongoing Clinical Study conducted by an ... IL, UV Angel is evaluating the efficacy of its product and its disinfection protocol. ... 30 beds) from May 2014 through October 2015 at a 360-bed, acute-care, academic medical ...
(Date:11/25/2015)... Spring, Md (PRWEB) , ... November 25, 2015 ... ... Pulmonary Hypertension Association (PHA) announces the nation’s Periwinkle Pioneers, individuals and groups responsible ... history of this disease. The Periwinkle Pioneers, nominated by the public, will receive ...
Breaking Medicine News(10 mins):
(Date:11/25/2015)... 2015 Kitov Pharma ceuticals ... a biopharmaceutical company focused on the development of therapeutic ... today announced the closing of its previously announced underwritten ... ), each representing 20 ordinary shares of the Company, ... ADSs and warrants were issued in a fixed combination ...
(Date:11/25/2015)...  Today AVACEN Medical announced the issue of United States patent No. ... ". This patent shields the company,s AVACEN 100 dry heat therapy medical device and specific methods ... Photo - ... ... ...
(Date:11/25/2015)... , Nov. 25, 2015 USP 800 ... drug preparations (e.g. pharmacists, pharmacy technicians, nurses, physicians, ... technicians). The chapter also covers all entities which ... pharmacies, hospitals, other healthcare institutions, patient treatment clinics, ... --> --> What is ...
Breaking Medicine Technology: