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Abstract. Purpose: Debridement, antibiotics, and implant retention (DAIR) is an established treatment modality in periprosthetic joint infections (PJIs), but success rates vary. This study compared the success of DAIR for PJIs after a total hip arthroplasty (THA), with or without local antibiotic delivery with CaSO4 as the carrier material.Methods: A retrospective review of DAIR for PJIs after THA performed between 2010 and 2018, including 41 patients is conducted. A total of 27 patients were treated by DAIR with local antibiotics with CaSO4 as the carrier material, and 14 patients were treated by a standard DAIR. The endpoints were treatment failure, defined as the need for a reoperation, either a second DAIR or a prosthesis removal or exchange due to persistent or recurrent infection, the initiation of a long-term suppressive antibiotic treatment, or death related to infection.Results: Considering any reoperation as an outcome, 11 of 14 cases treated without AB-CaSO4 (79 %) and 4 of the 27 cases treated withAB-CaSO4 failed (15 %). Considering revision as an outcome, 9 out of 14 cases treated without AB-CaSO4 (64 %) and 4 of the 27 cases treated with AB-CaSO4 (15 %) failed. A Kaplan–Meier survival analysis showed that local antibiotic delivery with CaSO4 as the carrier material led to a significantly longer infection-free survival, considering any surgical revision (p&lt;0.0001; hazard ratio 8.9 (95 % CI 2.8–28.2)) or revision with component exchange (p=0.0015; hazard ratio 5.6 (95 % CI 1.7–18.2)) as the endpoint.Conclusion: The addition of local antibiotics with CaSO4 as the carrier material to DAIR for PJIs after THA significantly increases success rates, such as infection-free survival, any reoperation, and revision with component exchange in particular.

journal of bone and joint infection

Local antibiotic treatment with calcium sulfate as carrier material improves the outcome of debridement, antibiotics, and implant retention procedures for periprosthetic joint infections after hip arthroplasty – a retrospective study