What to Know About a Bone Infection in the Foot

Infection can reach bone through an open wound or ulcer, spread from nearby tissue, enter after an injury or operation, or travel in the bloodstream. Local pain, warmth, swelling, redness, drainage, fever, or feeling unwell can occur, but the pattern varies.

Osteomyelitis is infection within bone. In the foot, a deep ulcer or puncture can provide a route for germs, particularly when diabetes, poor circulation, or reduced sensation makes a wound harder to notice or heal. Recent foot surgery, an open fracture, and a weakened immune system can also raise concern. These factors do not confirm infection; examination and testing are needed.

Assessment may include checking the skin, wound depth, sensation, blood flow, and the painful area. Blood tests, imaging, and a sample from deep tissue or bone may help identify infection and guide antibiotic choice. A superficial swab does not always reveal what is happening inside the bone.

Contact a medical service promptly if a foot wound becomes red, hot, swollen, more painful, foul-smelling, or starts draining, especially if bone is visible or you have diabetes, poor circulation, or reduced feeling in the feet. Keep the area clean and covered, avoid squeezing or cutting it, and reduce pressure on the affected foot until it is assessed.

Treatment is tailored to the route and extent of infection. Antibiotics are selected using the clinical picture and, where possible, culture results. Surgery may be required to drain pus, remove infected or dead tissue, stabilise bone, or cover a wound. After removal of damaged bone, reconstruction may sometimes include a bone graft. Wound care, pressure relief, circulation management, and glucose control may form part of the same plan.

Seek urgent medical care for fever or chills with a red, hot, swollen foot; redness spreading away from a wound; rapidly worsening pain or swelling; confusion; marked drowsiness; or feeling severely unwell. A black, pale, blue, or cold toe or foot also needs urgent assessment because blood flow may be compromised.

Do not wait for pain when you have reduced foot sensation. Inspect the foot for breaks in the skin, drainage, colour change, swelling, or an unfamiliar smell, and obtain prompt care for a wound that is deep, worsening, or not healing.

Ask what findings suggest the bone is involved, which tests can define the extent of infection, and whether a deep sample is needed before or during treatment. Find out how antibiotics will be chosen and monitored, whether pressure must be kept off the foot, and who will manage wound dressings. If surgery is proposed, ask what tissue must be removed, how the foot will be supported afterward, and which changes should trigger an earlier review.