Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Bone infection

—

In one line

·Bone gets infected when bacteria arrive from a nearby wound, surgery, or the bloodstream and multiply faster than the body can fight them off.

—

Normal physiology

·Healthy bone has a hard outer shell (the cortex) and a spongy inside (the medulla) packed with blood vessels that deliver oxygen, immune cells, and nutrients. That constant flow keeps bacteria from taking hold.

—

What goes wrong

·Bacteria reach the bone and multiply faster than the immune system can kill them. Blood vessels get squeezed or clotted off by swelling, which starves the bone and traps infection inside.

—

Hallmark signs

·Pain right over the infected bone that gets worse when you press or move it
·Warmth, redness, and swelling of the skin over the bone
·Fever and chills
·An open sore or draining wound near the bone that won't heal, especially in people with diabetes or poor circulation
·New or worsening limping, inability to bear weight, or refusal to use an arm or leg (especially in children)
·Bone tenderness or a positive probe-to-bone test in someone with a diabetic foot ulcer
·Fatigue, irritability, and poor appetite (especially in babies and young children)
·Visible pus draining from a surgical site, fracture, or puncture wound near bone

—

Red flags · escalate now

·Fever above 101.5°F (38.6°C) with bone pain, especially in a child or after surgery or injury
·Severe pain that does not improve with rest or over-the-counter pain medicine
·Red streaks spreading from the area, confusion, very fast heartbeat, or low blood pressure (signs bacteria are spreading into the bloodstream)
·A non-healing wound or ulcer over a bony area, especially in someone with diabetes, peripheral artery disease, or a weakened immune system
·New inability to move a limb, numbness, tingling, or loss of pulse below the infection site (may mean the infection is pressing on nerves or blood vessels)

—

Workup

·Red blood cell (Erythrocyte) sedimentation rate (ESR) and C-reactive protein (CRP)
·Blood cultures (two sets from different sites before antibiotics)
·Bone biopsy with culture and histology
·MRI of the affected bone with and without contrast
·Plain X-ray of the affected bone (two views)
·Complete blood count (CBC) with differential
·Hemoglobin A1c (HbA1c) in patients with diabetes

—

Treatment

·Blood cultures (two sets) and bone biopsy before starting antibiotics (unless patient is septic and unstable)
·Empiric IV antibiotics started immediately if patient is septic: vancomycin 15–20 mg/kg every 8–12 hours PLUS ceftriaxone 2 g daily or ciprofloxacin 400 mg every 12 hours
·Surgical debridement: remove all dead bone (sequestrum), pus, and infected hardware if present
·Pathogen-directed IV antibiotics for 4–6 weeks total (2–4 weeks IV, then switch to oral with high bioavailability like fluoroquinolones, linezolid, or trimethoprim-sulfamethoxazole based on culture results)
·Optimize blood sugar control (HbA1c < 7%) and stop smoking; evaluate blood vessels in diabetic foot with ankle-brachial index or vascular ultrasound
·Monitor ESR and CRP weekly; repeat MRI if clinical improvement stalls after 2–3 weeks of treatment

—

NCLEX trap

·Get a bone biopsy and blood cultures BEFORE you give antibiotics (unless the patient is crashing into septic shock right now and can't wait). The culture shows you exactly which germ is eating the bone so you can pick the antibiotic that kills it. If you give antibiotics first, they hide the bacteria and the lab can't grow anything — then you're shooting in the dark.
·Bone infection takes 10 to 14 days to show up on a plain X-ray. Early osteomyelitis looks totally normal on X-ray because the bone hasn't started to break down yet. Use MRI (the gold standard — it lights up infection in hours to days) or a nuclear bone scan if you suspect osteomyelitis early.
·Osteomyelitis needs at least 4 to 6 weeks of antibiotics — often IV (through a vein) for the first 2 to 6 weeks, then oral pills to finish. Bone has terrible blood flow, so antibiotics take a long time to reach high enough levels to kill the bacteria. Stop early and the infection comes roaring back, often worse and resistant.
·Hardware can sometimes stay in place if the infection clears with long-term antibiotics and the hardware is still stable and doing its job. You only need to take the hardware out if it's loose, the bone around it is dying, or the infection won't go away despite treatment. The orthopedic surgeon decides case by case.
·Dead bone (called a sequestrum — a chunk of bone that lost its blood supply and died) and pockets of pus won't respond to antibiotics because antibiotics travel in blood and dead bone has none. Surgery to cut out the dead bone and drain the pus is often essential. Without it, antibiotics hit a wall and the infection hides and festers.
·You can absolutely have osteomyelitis with a completely normal white count — especially chronic (long-standing) bone infection or infection in people with diabetes or weak immune systems. A low or normal white count does NOT mean no infection. Always look at the whole picture: imaging, labs, and what you see at the bedside.

—

Install Maldek by Hill as an app — studies work even offline