Featured Research

from universities, journals, and other organizations

'Squeaky' Hip Implants

Date:
February 27, 2009
Source:
Mayo Clinic
Summary:
With the growing success of joint replacement surgeries, patients have become accustomed to certain indignities related to having a metal replacement part in a hip, knee or shoulder. For example, they tend to set off airport metal detectors and attract attention of security personnel. Now, there's more.

With the growing success of joint replacement surgeries, patients have become accustomed to certain indignities related to having a metal replacement part in a hip, knee or shoulder. For example, they tend to set off airport metal detectors and attract attention of security personnel. Now, there's more.

Related Articles


To the acoustical signature of the orthopedic implant detected by a security sweep, add the distinctive "hip squeak." The sound is associated with implants made of a material known as alumina ceramic-on-ceramic — and is audible to the person with the implant and those nearby.

While the hip squeak was previously known to experts, its precise cause has been a mystery. The Mayo Clinic Biomechanics Laboratory report released today sheds light on the potential causes of the squeak, thus guiding means of eliminating it.

After 11,000 cycles of tests in a mechanical simulator that reproduced the flexion and extension motions of the hip, Mayo Clinic investigators concluded that:

  • Squeaking occurred when the film fluid between the two moving surfaces was disrupted.
  • Disruption could be caused by the presence of particles that originate from wear and tear, or from imperfect alignment or positioning of implant surfaces.
  • Squeaking occurred especially quickly under highest pressure on the artificial joint.
  • Once squeaking started, it didn't stop — and was constant at all frequencies tested.

According to Robert Trousdale, M.D., the lead Mayo investigator: "Adding a small amount of lubricant solved the problem in the lab. Our research is helpful because it can be applied to devising a solution to the squeak problem. Most likely that will consist of improving the design of implants so they have less chance of material transfer and disruption, which appears to be an important aspect in the basis of the squeak."

Mayo Clinic orthopedic surgeons presented this research at the annual meeting of the American Academy of Orthopedic Surgeons (AAOS) in Las Vegas, Feb. 25-March 1.


Story Source:

The above story is based on materials provided by Mayo Clinic. Note: Materials may be edited for content and length.


Cite This Page:

Mayo Clinic. "'Squeaky' Hip Implants." ScienceDaily. ScienceDaily, 27 February 2009. <www.sciencedaily.com/releases/2009/02/090227130342.htm>.
Mayo Clinic. (2009, February 27). 'Squeaky' Hip Implants. ScienceDaily. Retrieved October 30, 2014 from www.sciencedaily.com/releases/2009/02/090227130342.htm
Mayo Clinic. "'Squeaky' Hip Implants." ScienceDaily. www.sciencedaily.com/releases/2009/02/090227130342.htm (accessed October 30, 2014).

Share This



More Health & Medicine News

Thursday, October 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Mind-Controlled Prosthetic Arm Restores Amputee Dexterity

Reuters - Innovations Video Online (Oct. 29, 2014) A Swedish amputee who became the first person to ever receive a brain controlled prosthetic arm is able to manipulate and handle delicate objects with an unprecedented level of dexterity. The device is connected directly to his bone, nerves and muscles, giving him the ability to control it with his thoughts. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Google To Use Nanoparticles, Wearables To Detect Disease

Google To Use Nanoparticles, Wearables To Detect Disease

Newsy (Oct. 29, 2014) Google X wants to improve modern medicine with nanoparticles and a wearable device. It's all an attempt to tackle disease detection and prevention. Video provided by Newsy
Powered by NewsLook.com
Can Drinking Milk Lead To Early Death?

Can Drinking Milk Lead To Early Death?

Newsy (Oct. 29, 2014) Researchers in Sweden released a study showing heavy milk drinkers face an increased mortality risk from a variety of causes. Video provided by Newsy
Powered by NewsLook.com
Obama: The US Will Not 'run and Hide' From Ebola

Obama: The US Will Not 'run and Hide' From Ebola

AP (Oct. 29, 2014) Surrounded by health care workers in the White House East Room, President Barack Obama said the U.S. will likely see additional Ebola cases in the weeks ahead. But he said the nation can't seal itself off in the fight against the disease. (Oct. 29) Video provided by AP
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