Background: The usefulness of a mandatory joint aspiration before re-implantation in patients with a cement spacer already in place is unclear.
Aim: To evaluate the role of culturing synovial fluid obtained by joint aspiration before re-implantation in patients who underwent a two-stage septic revision.
Methods: A retrospective observational study was conducted, including patients that underwent a two-stage septic revision (hip or knee) from 2010 to 2017. After the first stage revision and according to intraoperative culture results, all patients were treated with an antibiotic protocol for 6-8 wk. Following 2 wk without antibiotics, a culture of synovial fluid was obtained. The results of these cultures were recorded and compared with cultures obtained during re-implantation surgery.
Results: Forty-one patients (20 hip and 21 knee spacers) were included in the final analysis. In 39 cases, the culture of synovial fluid was negative, while in the remaining 2 cases (knee spacers) no analysis was possible due to dry tap. In 5 of the patients, two or more intraoperative cultures taken during the re-implantation surgery were positive.
Conclusion: We found no evidence to support mandatory joint aspiration before re-implantation in patients with a cement spacer in place.
Keywords: Joint aspiration; Periprosthetic joint infection; Revision surgery; Synovial fluid; Two-stage surgery.
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