Screw augmentation to the acetabulum provides better stabili
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The prosthesis of antibiotic-loaded acrylic cement (PROSTALAC) is widely used in two-stage revision arthroplasty in periprosthetic joint infection (PJI) after total hip arthroplasty (THA). The aim of this study was to compare the results of two-stage revision arthroplasties with antibiotic-loaded cement spacers with or without screws on the acetabulum for PJI.

This retrospective study included 44 patients who underwent a two-stage revision THA for PJI from June 2007 to May 2017. Researchers divided the patients into two groups: group 1 consisted of 21 patients (21 hips) who underwent two-stage revision arthroplasty with screw augmentation, while group 2 consisted of 23 patients (23 hips) who underwent the same surgery without screw augmentation at the acetabular cement spacer. They compared the migration and dislodgement of the acetabular cement spacer between the two groups.

Before the second-stage surgery, there was less vertical migration of the cement spacer in group 1 compared to group 2 (1.2 mm vs 3.1 mm). There was also less medial migration of the cement0 spacer in group 1 (0.6 mm vs 1.06 mm). After the first stage, the mean Harris Hip score was significantly higher in group 1 than in group 2 (75 vs 65). Cement spacer rotation or total movement out of the acetabular area occurred in six patients, all in group 2. After the first stage reinfection occurred in two patients, one in each group. Screw augmentation to the acetabulum in the first-stage surgery provides better stability of acetabular antibiotic cement spacers without increasing the reinfection rate.