Flashcards in 5.3. Bone and Soft Tissue Infection - Acute Septic Arthritis Deck (14):
What is the Route of Infection for Acute Septic Arthritis?
1. Direct Invasion
2. Eruption of a Bone Abscess
3. Haematogenous (Blood) Spread
What are the different ways Acute Septic Arthritis can be spread, via Direct Invasion?
1. A Penetrating Wound (Iatrogenic - Joint Injection)
2. An Intra-Articular Injury
What are the most common causative Organisms of Acute Septic Arthritis?
1. Staph. Aureus
2. H. Influenzae
3. Strep. Pyogenes
4. E. Coli
What is the Pathology of Acute Septic Arthritis?
Due to the infection:
1. Articular Cartilage is attacked by the Bacterial Toxins and Cellular Enzymes
2. This causes Acute Synovitis with Purulent Joint Efusion
3. This leads to complete distruction of the Articular Cartilage
What are the recovery options (Sequelae) for Acute Septic Arthritis?
1. Complete Recovery
2. Partial Loss of the Articular Cartilage, and Subsequent Osteoarthritis
3. Fibrous / Bony Ankylosis
What is the Clinical Presentation of Acute Septic Arthritis in a Neonate?
2. Resistant to Movement
What is the Clinical Presentation of Acute Septic Arthritis in a Child?
1. Reluctance to move the Joint
2. Increase in Temperature
3. Increase in Pulse
4. Increase in tenderness
Which joints does Acute Septic Arthritis most commonly present in Adults?
How common is Acute Septic Arthritis in healthy adults?
What are the investigations of Acute Septic Arthritis?
1. Full Blood Count
2. White Cell Count
3. Inflammatory Markers - ESR + CRP
4. Blood Cultures
7. Fine Needle Aspiration
What is the most common cause of Acute Septic Arthritis in an Adult?
An Infected Joint Replacement
What is the outcome of an Infected Joint Replacement?
1. Removal or Arthroplasty
Note this is very rare but disasterous
What is the Differential Diagnosis of Acute Septic Arthritis?
1. Acute Osteomyelitis
3. Irritable Joint Syndrome
5. Rheumatic Fever
7. Gaucher's Disease