Do Cultures Obtained During Primary THA Predict the Likelihood of Revision?

Area of Science:

• Orthopedic Surgery
• Infectious Disease
• Biomedical Engineering

Background:

• Unexpected positive culture results can occur during elective hip arthroplasty.
• The association between positive intraoperative cultures and the risk of premature revision after total hip arthroplasty (THA) is not well-established.

Purpose of the Study:

• To determine if positive intraoperative culture results during elective THA are associated with an increased likelihood of revision surgery within five years.

Main Methods:

• A retrospective study analyzed 364 patients undergoing elective primary THA between 2007 and 2011.
• Intraoperative hip joint cultures were systematically collected and analyzed.
• Patients were followed for five years to assess revision rates and causes.

Main Results:

• Positive culture results were significantly associated with a higher risk of revision within five years (10% vs. 2%, p=0.01).
• Aseptic loosening was the primary reason for revision in the positive culture group (8% vs. 1%, p=0.01).
• Multivariable analysis identified positive intraoperative cultures as an independent predictor of five-year revision (OR 4.9).

Conclusions:

• Bacterial contamination during THA is linked to an increased risk of early revision, mainly due to presumed aseptic loosening.
• Emphasizing the need to rule out infection is critical for improving THA outcomes.
• Further prospective studies are warranted to confirm these findings and refine patient selection.