Common cause of acute osteomyelitis is DLETE
**Core Concept**
Acute osteomyelitis is a bone infection caused by the spread of microorganisms from adjacent soft tissues or hematogenous spread from a distant site. The most common cause is Staphylococcus aureus, which infects the bone through the vascular supply.
**Why the Correct Answer is Right**
Staphylococcus aureus produces toxins that damage the bone and surrounding soft tissues. The bacteria exploit the bone's blood supply, leading to the invasion of osteocytes and the subsequent infection. The microorganisms often enter the bone through the nutrient arteries or the metaphyseal arteries, which are rich in blood supply and provide a conduit for bacterial spread.
**Why Each Wrong Option is Incorrect**
**Option A:** While E. coli can cause osteomyelitis, especially in immunocompromised patients or those with urinary tract infections, it is not the most common cause.
**Option B:** Pseudomonas aeruginosa can cause osteomyelitis, particularly in patients with compromised immunity or indwelling medical devices, but it is not the most common cause.
**Option C:** Group A beta-hemolytic streptococci can cause osteomyelitis, especially in children, but they are not the most common cause in adults.
**Clinical Pearl / High-Yield Fact**
Staphylococcus aureus is the most common cause of acute osteomyelitis, and it often presents with systemic symptoms such as fever, malaise, and leukocytosis. Early diagnosis and treatment are crucial to prevent long-term complications and improve patient outcomes.
**Correct Answer: D. Staphylococcus aureus**