We studied hip and knee prosthetic joint infections  caused by Staphylococcus epidermidis, a common pathogen that can form biofilm on implants. We reviewed over 100 cases to understand how antibiotic resistance affects treatment success. We found that infections resistant to rifampin, levofloxacin, or multiple antibiotics showed a higher failure rate. These findings may help surgeons choose the best surgical and antibiotic treatment approach for patients.