Case study: A 56-Year-Old Male with Knee Pain, Knee Cellulitis
Knee Cellulitis Knee cellulitis is a localized infection of the skin and subcutaneous tissues around the knee joint. It is an important clinical entity due to its potential for rapid progression and the need for prompt recognition and treatment. 1. Cause and Etiology Cause: Knee cellulitis is most commonly caused by bacterial infection, typically when pathogens breach the skin barrier and invade the dermis and subcutaneous tissues. Etiology: Most common organisms: Streptococcus pyogenes (Group A Streptococcus) – most common Staphylococcus aureus , including MRSA (Methicillin-resistant Staphylococcus aureus ) Entry points (predisposing conditions): Trauma (abrasions, lacerations, insect bites) Post-surgical wound infection (e.g., after knee arthroscopy or total knee arthroplasty) Skin barrier disruption from eczema, psoriasis, and tinea pedis Chronic venous insufficiency or lymphedema Intravenous drug use ...