28 September 2025
: Case report 
Prosthetic Knee Joint Infection with Haemophilus influenzae 1 Year After Total Knee Arthroplasty: A Case Report and Literature Review
Unusual clinical course, Challenging differential diagnosis, Educational Purpose (only if useful for a systematic review or synthesis)
Ahmed AlSharakhat
ABDEF 1, Safiya AlMusawi ABDEF 2*, Ahmed Husain BD 3, Wafa Hasan BD 4, Nisha Chandran Vijayamma BD 1, Feras AlMarzooq ABDEF 3
DOI: 10.12659/AJCR.950298
Am J Case Rep 2025; 26:e950298
Figure 3 Microscopic examination of the synovial tissue revealed significant features consistent with an active inflammatory process. The synovial lining demonstrated marked hyperplasia, with an increase in the number of synoviocytes and congestion indicated by the shorter arrow. The underlying stroma was noted to be highly congested, with dilated blood vessels indicative of increased vascularity. A prominent feature was the dense neutrophilic infiltration marked by the longer arrow, indicating an acute inflammatory response (hematoxylin and eosin stain, at 10x magnification).