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.

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 July 24, 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 July 24, 2014).

Share This




More Health & Medicine News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

New Painkiller Designed To Discourage Abuse: Will It Work?

New Painkiller Designed To Discourage Abuse: Will It Work?

Newsy (July 24, 2014) The FDA approved Targiniq ER on Wednesday, a painkiller designed to keep users from abusing it. Like any new medication, however, it has doubters. Video provided by Newsy
Powered by NewsLook.com
Doctor At Forefront Of Fighting Ebola Outbreak Gets Ebola

Doctor At Forefront Of Fighting Ebola Outbreak Gets Ebola

Newsy (July 24, 2014) Sheik Umar Khan has treated many of the people infected in the Ebola outbreak, and now he's become one of them. Video provided by Newsy
Powered by NewsLook.com
Condemned Man's US Execution Takes Nearly Two Hours

Condemned Man's US Execution Takes Nearly Two Hours

AFP (July 24, 2014) America's death penalty debate raged Thursday after it took nearly two hours for Arizona to execute a prisoner who lost a Supreme Court battle challenging the experimental lethal drug cocktail. Duration: 00:55 Video provided by AFP
Powered by NewsLook.com
China's Ageing Millions Look Forward to Bleak Future

China's Ageing Millions Look Forward to Bleak Future

AFP (July 24, 2014) China's elderly population is expanding so quickly that children struggle to look after them, pushing them to do something unexpected in Chinese society- move their parents into a nursing home. Duration: 02:07 Video provided by AFP
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:
from the past week

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