Infected prosthetic knees cause problems

Dec 06, 2010

The number of people that undergo an operation to have a prosthetic knee joint is increasing. One reason is that the population is getting older, another is that people are also getting heavier, which is a factor in the development of osteoarthritis. The number of knee replacement operations has increased by 9 per cent a year in recent years.

"So if 1-2 per cent of the operations lead to , then the need for revision – re-operation – will also increase", says Anna Stefánsdóttir.

This often involves two operations. First, the old prosthesis is removed and temporarily replaced with bone cement, while the patient is treated with antibiotics to eradicate the infection. This takes 6-7 weeks and during this time the patient can usually remain at home. Then a further operation follows to insert a new prosthesis.

In some cases it is not possible to put in a new prosthesis. These patients can be treated with an arthrodesis, or removal of the prosthesis (which leaves the leg without a real knee joint, often confining the patient to a wheelchair). In exceptional cases the infection leads to amputation.

Anna Stefánsdóttir has reviewed almost 480 cases of revision between 1986 and 2000.

"Over time more patients have received a new knee prosthesis and fewer are treated with an arthrodesis, but still there are many people who do not get rid of the infection. Other studies show that those who have to have a second operation because of an infection are less satisfied than those who have to have their knee joint changed because the prosthesis has come loose or become worn", she says.

Therefore it is important that the healthcare service does its utmost to avoid infection in the wound. This means having good ventilation in the operating theatre, ensuring the doors are tightly closed, and ensuring that preventive antibiotics are given at exactly the right time before the operation.

"It is also important to be observant of wound complications. If an infection is discovered in time, it is possible to open the wound and clean out the bacteria before they have had chance to spread. Newly operated patients should have a 'VIP lane' so that they can go straight to the hospital orthopaedics department and not have to go via primary care", says Anna Stefánsdóttir.

In Ms Stefánsdóttir's view, re-operations due to infection should be centralised to specialist units, because they require such close cooperation between orthopaedists and infectious disease specialists.

Nowadays, there are orthopaedics clinics that only carry out one such operation a year, which makes it more difficult to establish the right routines.

Explore further: Mali announces new Ebola case

add to favorites email to friend print save as pdf

Related Stories

How often do hip and knee replacements need revision?

Sep 02, 2008

A comprehensive study using nationwide data on hip and knee replacements in England has found that one in seventy-five patients require a revision of their joint replacement after three years. Although this compares favourably ...

Joint replacement: Does this look infected to you?

Sep 09, 2010

The American Academy of Orthopaedic Surgeons (AAOS) recently approved and released an evidence-based clinical practice guideline on the diagnosis of periprosthetic joint infections of the hip and knee. Clinical practice guidelines ...

Recommended for you

Mali announces new Ebola case

3 hours ago

Mali announced Saturday a new case of Ebola in a man who is fighting for his life in an intensive care unit in the capital Bamako.

Plague outbreak kills 40 in Madagascar: WHO

3 hours ago

An outbreak of plague has killed 40 people in Madagascar, the World Health Organization said, warning that the disease could spread rapidly in the country's densely populated capital Antananarivo.

UN chief: Ebola cases in Mali a 'deep concern'

17 hours ago

The United Nations chief warned Friday that Ebola may be easing in part of West Africa but is still hitting hard in other areas and outpacing the international response.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.