Surgical site infections (SSIs) associated with total knee replacement surgery

Why is this measure important?

Total knee replacement surgery is performed when the patient’s knee joint becomes diseased or damaged to the point that it limits motion and is very painful. It is most often used for patients with osteoarthritis or rheumatoid arthritis. During total knee replacement, a surgeon removes damaged bone and cartilage (types of tissue) from the thighbone, shinbone, and kneecap. The surgeon then replaces these parts with an artificial joint made of safe, long-lasting materials.
Sometimes the area of the body where the surgery takes place can become infected. This is called a surgical site infection (SSI). SSIs can involve the skin, tissues under the skin, organs, or implanted material. These infections can cause serious problems and even death.
Hospital staff members can prevent most SSIs after total knee replacement surgery by following the infection control guidelines recommended by the Centers for Disease Control and Prevention (CDC). Hospitals following these safety guidelines will likely have low numbers in this measure.

What does this measure show?

The score for surgical site infections (SSIs) associated with total knee replacement surgery is shown as a Standardized Infection Ratio (SIR). This ratio is found by comparing the number of SSIs associated with total knee replacement surgery at Northwestern Memorial to a national benchmark.
Northwestern Memorial’s performance in this measure is placed into one of three categories based on the results of a statistical analysis that compares our performance with the performance ratio of other hospitals. These categories are:
·         Statistically significantly better than the national average, or performing at the best possible rate
·         Not statistically significantly better or worse than the national average
·         Statistically significantly worse than the national average
Based on the statistical analysis, our most recent ratio is within a range of ratios that is considered to be Not statistically significantly better or worse than national average.
For this measure, a lower number is better.
Most Recent Available Data (Standardized Infection Ratio)
  2012 Q2
Northwestern Memorial 0.32
National Database Participant Comparison 1
Source:Illinois Department of Public Health
SSI after knee replacement surgery