Periprosthetic infections occur with an incidence of 1%- 3% of patients (depending on the joint) but nevertheless are a serious complication of hip arthroplasties. There are many questions pertaining to the diagnostic tools and one-stage and two-stage revisions that still have to be answered and existing procedures are based more on empirical findings than on data from prospective studies with a high level of evidence. It is for this reason that the following aspects of revision have been treated very differently by different groups: one-stage or two-stage procedure, spacer or not, the type of spacer, the type of antibiotic used in the spacer, the duration of the spacer period, the duration of systemic antibiotic treatment, aspiration before reimplantation, and the type of reimplantation (cemented or cementless). Moreover, it is unclear if the same concepts of periprosthetic joint infection of the hip and knee can be used on other joints like shoulder or ankle. This issue aims to answer some of the questions.

Potential topics include but are not limited to the following:

• New diagnostic tools for late periprosthetic joint infections
• One-stage versus two-stage in periprosthetic infections of hip arthroplasties
• One stage revision of infected total hip arthroplasties: important requirements for success
• One-stage revision using cementless implants in PJI of hip arthroplasties
• One-stage versus two-stage in periprosthetic infections of knee arthroplasties
• Two-stage revisions in septic hip arthrolasties with and without spacers
• Pros and cons of spacers in the treatment of late periprosthetic infections of the hip
• Mixing of antibiotics into the spacer-cement. How many is ideal?
• What is the ideal length of systemic antibiotic therapy?
• Is aspiration helpful before the reimplantation in septic two-stage revision?
• Periprosthetic joint infection of shoulder arthroplasties: diagnostic and treatment options
• Periprosthetic joint infection of elbow arthroplasties
• Periprosthetic joint infection of ankle arthroplasties