Featured Research

from universities, journals, and other organizations

Land on your toes, save your knees

Date:
October 6, 2010
Source:
University of California - Davis - Health System
Summary:
Anterior cruciate ligament injuries are a common and debilitating problem, especially for female athletes.

Play basketball? Land on your toes, save your knees.
Credit: iStockphoto

Anterior cruciate ligament injuries are a common and debilitating problem, especially for female athletes. A new study from UC Davis shows that changes in training can reduce shear forces on knee joints and could help cut the risk of developing ACL tears. The research was published online Aug. 3 in the Journal of Biomechanics.

Related Articles


"We focused on an easy intervention, and we were amazed that we could reduce shear load in 100 percent of the volunteers," said David Hawkins, professor of neurobiology, physiology and behavior at UC Davis. Hawkins conducted the study at the UC Davis Human Performance Laboratory with graduate student Casey Myers.

The anterior cruciate ligament lies in the middle of the knee and provides stability to the joint. Most ACL injuries do not involve a collision between players or a noticeably bad landing, said Sandy Simpson, UC Davis women's basketball coach.

"It almost always happens coming down from a rebound, catching a pass or on a jump-stop lay-up," Simpson said. "It doesn't have to be a big jump."

Hawkins and Myers worked with 14 female basketball players from UC Davis and local high schools. They fitted them with instruments and used digital cameras to measure their movements and muscle activity, and calculated the forces acting on their knee joints as they practiced a jump-stop movement, similar to a basketball drill.

First, they recorded the athletes making their normal movement. Then they instructed them in a modified technique: Jumping higher to land more steeply; landing on their toes; and bending their knees more deeply before taking off again.

After learning the new technique, all 14 volunteers were able to reduce the force passed up to the knee joint through the leg bone (the tibial shear force) by an average of 56 percent. At the same time, the athletes in the study actually jumped an inch higher than before, without losing speed.

Hawkins recommends warm-ups that exercise the knee and focusing on landing on the toes and balls of the feet. The study does not definitively prove that these techniques will reduce ACL injuries, Hawkins said: that would require a full clinical trial and follow-up. But the anecdotal evidence suggests that high tibial shear forces are associated with blown knees.

Hawkins and Myers shared their findings with Simpson and other UC Davis women's basketball and soccer coaches, as well as with local youth soccer coaches.

Simpson said that the team had tried implementing some changes during last year's preseason, but had found it difficult to continue the focus once the full regular season began. In live play, athletes quickly slip back to learned habits and "muscle memory" takes over, he noted. More intensive off-court training and practice would be needed to change those habits, he said.

"We will be talking about this again this season," Simpson said. Implementing the techniques in youth leagues, while children are still learning how to move, might have the most impact, he said.


Story Source:

The above story is based on materials provided by University of California - Davis - Health System. Note: Materials may be edited for content and length.


Cite This Page:

University of California - Davis - Health System. "Land on your toes, save your knees." ScienceDaily. ScienceDaily, 6 October 2010. <www.sciencedaily.com/releases/2010/08/100811093013.htm>.
University of California - Davis - Health System. (2010, October 6). Land on your toes, save your knees. ScienceDaily. Retrieved March 3, 2015 from www.sciencedaily.com/releases/2010/08/100811093013.htm
University of California - Davis - Health System. "Land on your toes, save your knees." ScienceDaily. www.sciencedaily.com/releases/2010/08/100811093013.htm (accessed March 3, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Tuesday, March 3, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mom Triumphs Over Tragedy, Helps Other Families

Mom Triumphs Over Tragedy, Helps Other Families

AP (Mar. 3, 2015) After her son, Dax, died from a rare form of leukemia, Julie Locke decided to give back to the doctors at St. Jude Children&apos;s Research Hospital who tried to save his life. She raised $1.6M to help other patients and their families. (March 3) Video provided by AP
Powered by NewsLook.com
Looted and Leaking, South Sudan's Oil Wells Pose Health Risk

Looted and Leaking, South Sudan's Oil Wells Pose Health Risk

AFP (Mar. 3, 2015) Thick black puddles and a looted, leaking ruin are all that remain of the Thar Jath oil treatment facility, once a crucial part of South Sudan&apos;s mainstay industry. Duration: 01:13 Video provided by AFP
Powered by NewsLook.com
Woman Convicted of Poisoning Son

Woman Convicted of Poisoning Son

AP (Mar. 3, 2015) A woman who blogged for years about her son&apos;s constant health woes was convicted Monday of poisoning him to death by force-feeding heavy concentrations of sodium through his stomach tube. (March 3) Video provided by AP
Powered by NewsLook.com
Treadmill Test Can Predict Chance Of Death Within A Decade

Treadmill Test Can Predict Chance Of Death Within A Decade

Newsy (Mar. 2, 2015) Johns Hopkins researchers analyzed 58,000 heart stress tests to come up with a formula that predicts a person&apos;s chances of dying in the next decade. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins