Immune-inflammatory response in infected arthroplasties

Area of Science:

• Orthopedics
• Immunology
• Pathology

Background:

• Purulent endoprosthetic infections present diagnostic challenges.
• Understanding synovial fluid cytology is crucial for differentiating infection types.
• Immunocytochemistry offers detailed cell analysis.

Purpose of the Study:

• To investigate the immunocytological profile of synovial fluid in patients with purulent endoprosthetic infections.
• To characterize monocyte and T lymphocyte subsets using specific monoclonal antibodies.
• To compare these findings with non-infectious inflammatory joint conditions.

Main Methods:

• Synovial fluid samples from patients with purulent endoprosthetic infections were analyzed.
• Avidin-biotin-peroxidase complex staining was employed for immunocytochemistry.
• Cell subtype-specific monoclonal antibodies (targeting CD15 and CD2) were used.
• Mononuclear cell populations were quantified and their phenotypes determined.

Main Results:

• Two-thirds of monocytes in the synovial fluid were CD15-positive.
• CD2-positive T lymphocytes constituted only one-third of all mononuclear cells.
• The ratio of monocytes to activated T-cells in purulent infections was distinct.
• This ratio differed significantly from findings in sterile inflammatory, reactive, and rheumatoid arthritis conditions.

Conclusions:

• Synovial fluid immunocytology can help differentiate purulent endoprosthetic infections.
• The observed CD15+ monocyte and CD2+ T-cell profiles are characteristic of these infections.
• This immunophenotyping approach provides valuable diagnostic information beyond traditional methods.