Explanation of Outcomes Terms

  • Antibiotic Within One Hour of Cut Time

    This represents the percentage of surgical patients who received antibiotic drugs one hour before the first surgical incision. Antibiotics help prevent wound infections after surgery. When patients receive antibiotics more than one hour before surgery, or after surgery begins, the drugs are not as effective.

    Appropriate Antibiotic Selection

    This is the percentage of patients who received appropriate antibiotic drugs before and after surgery at Memorial University Medical Center. Specific antibiotics are used to treat or prevent various infections. The surgeon must determine which antibiotics are most appropriate for each patient’s surgery.

    Antibiotics Discontinued Within 24 to 48 Hours

    This is the percentage of patients who stopped receiving preventive antibiotics within 24 to 48 hours after surgery. Preventive antibiotics should begin one hour before surgery. If there is no infection after surgery, the antibiotics can be stopped within one day, or two days for heart surgeries. Taking antibiotics when they are not needed can lead to harmful side effects or antibiotic-resistant bacteria.

    Blood Clots in the Hospital

    Blood clots can be a side effect of surgery. Deep vein thrombosis (DVT) is a blood clot that forms inside a deep vein, often in the lower leg. If it is not diagnosed and treated, it can travel to the lungs and cause a pulmonary embolism (PE). This is a very serious condition that can result in death if it is not diagnosed and treated. To help prevent blood clots, patients are encouraged to get up and walk around after surgery. They are also given special stockings to wear to help prevent DVT.

    Readmitted to the Hospital within 30 Days

    Occasionally, people will experience complications in the month after surgery and must be readmitted to the hospital. There may be a variety of reasons for this and each case varies. The number we present shows the total percent of people admitted to the hospital following hip or knee replacement surgery.

    Hip Revision

    Redoing a hip replacement that was performed within the previous year.

    Knee Revision

    Redoing a knee replacement that was performed within the previous year.


    An infection at the surgical site that develops within 30 days of surgery.