Isla Bennett
Antibiotic-coated nails are used to treat bone infections, also known as osteomyelitis. This treatment involves inserting an antibiotic-coated nail or rod into the bone to stabilize it and treat the infection from within. The coating is made by mixing powdered antibiotics with orthopedic cement, creating a viscous substance that can be molded onto the nail before it hardens. During surgery, the bone is reamed, washed, and then the coated nail is inserted and secured with screws. The antibiotics slowly release into the bone over 4 to 6 weeks, providing high concentrations where they are needed most while reducing the risk of organ toxicity. This treatment offers advantages over traditional methods, such as improved stability and reduced risk of infection.
| Characteristics | Values |
|---|---|
| Purpose | Treat bone infections and stabilize broken bones |
| Materials | Orthopedic cement (polymethyl methacrylate), powdered antibiotics, carbon fiber nail, sterile mineral oil, plastic tube, cement gun, cool sterile saline bath |
| Procedure | 1. Measure the length, width, and curvature of the medullary cavity with a CT scan. 2. Create a 3D-printed mold. 3. Fill the mold with cement and insert the nail. 4. Allow the cement to harden. 5. During surgery, insert the coated nail into the bone and secure with screws. |
| Benefits | Reduced risk of infection, improved bone stabilization, decreased treatment time and cost |
| Limitations | Thin coating may result in easy damage and limited antibiotic release |
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What You'll Learn
Antibiotic-coated nails are used to treat bone infections
To make the nail antibiotic-coated, orthopedic cement, or polymethyl methacrylate—similar to what is used in knee replacements—is mixed with powdered antibiotics. This creates a viscous, play-dough-like substance that can be placed onto the rod. The cement is molded onto the surface of the rod and allowed to cure before insertion, taking under five minutes to apply and around 10 minutes to harden.
The coated rod is then inserted into the bone in the same way as a non-coated rod. The central marrow canal of the bone is first reamed with special drills to remove any dead or infected bone, and the bone is thoroughly washed before the rod is put in place. Screws are then placed at the top and bottom of the rod to secure it, and incisions are closed with sutures or staples.
The antibiotics in the cement slowly leach out over a period of 4 to 6 weeks, providing extremely high concentrations of antibiotics directly to the infected bone. This method ensures that most of the antibiotics remain in the bone, reducing the risk of toxicity to organs such as the liver and kidneys.
Antibiotic-coated nails have shown great promise in treating bone infections due to their ability to provide local antibiotic administration and stabilization of bone defects. This treatment offers advantages over traditional methods, such as increased stability, reduced risk of infection, and fewer required operations.
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Antibiotic cement is applied to the nail before insertion
Antibiotic cement-coated nails are used to treat bone infections and defects. The procedure is often recommended for patients with a history of infection with prior surgery, open fractures, or complex medical problems that place them in a high-risk situation for infection.
The antibiotic cement is applied to the nail before insertion. This is done by mixing powdered antibiotic with orthopedic cement (polymethyl methacrylate), creating a viscous, play-dough-like substance. This mixture is then placed onto the nail, which is typically a thin, cylindrical metal rod used to stabilize broken bones. The cement is moulded onto the surface of the nail and allowed to cure before insertion.
To ensure a perfect fit between the nail and the patient's medullary cavity, a 3D-printed splint mould is sometimes used. The mould is filled with paraffin oil to prevent adhesion, and then filled with the cement. The nail is placed in the centre of the mould and tightened. Once the cement sets, the mould is removed, resulting in a uniform coating of antibiotic cement on the nail.
The entire process of coating the nail with cement takes under five minutes, and the cement hardens within 10 minutes. After curing, the nail is inserted into the patient's bone in the same way as an uncoated nail. The antibiotic in the cement slowly releases into the surrounding bone and tissues over a period of 4 to 6 weeks, providing extremely high concentrations of antibiotics directly to the site of infection. This method minimizes the risk of toxicity to organs such as the liver and kidneys.
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The cement is allowed to cure and harden
Antibiotic cement-coated nails are used to treat bone infections, also called osteomyelitis. The cement is prepared by mixing orthopedic cement, technically called polymethyl methacrylate, with powdered antibiotics. This creates a viscous, play-dough-like substance that can be placed onto the nail.
The cement-coated nail is then allowed to cure and harden. This process usually takes around 10 minutes. During this time, the cement hardens and sets, forming a strong and durable coating on the nail.
Once the cement has cured, the nail can be inserted into the bone. The curing process ensures that the antibiotic coating is securely attached to the nail and will not come off during insertion or while in place.
The curing and hardening of the cement are crucial steps in the process of creating an antibiotic-coated nail. It ensures that the antibiotic coating is intact and will slowly release antibiotics into the surrounding bone tissue over 4 to 6 weeks. This provides a high concentration of antibiotics directly to the site of infection, maximizing its effectiveness in treating the bone infection while minimizing the risk of toxicity to organs such as the liver and kidneys.
Overall, the curing and hardening of the cement play a vital role in the success of antibiotic-coated nails as a treatment for bone infections.
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The coated nail is inserted and secured with screws
Antibiotic-coated nails are used to treat bone infections and can be a good alternative to traditional treatments such as external fixation, which may not provide enough stability and can increase the risk of infection. The coated nail is inserted in much the same way as an uncoated nail.
Firstly, the patient is placed under anaesthesia. Then, the central marrow canal of the bone is reamed with special drills to remove any dead or infected bone. The bone is then thoroughly washed. Before inserting the coated nail, the bone canal must be measured to ensure the nail is the correct length, width, and curvature. This can be done using a thin-layer CT scan.
Once the bone has been prepared, the coated nail can be inserted. The nail is placed into the canal in the centre of the bone. The coating of the nail with cement should take under five minutes, and it hardens in around 10 minutes.
Once the coated nail is in place, screws are placed at the top and bottom of the nail to hold it securely inside the bone. The incisions are then closed with sutures or staples, and the patient is taken to the recovery room.
The antibiotics in the cement will slowly leach out over a period of 4-6 weeks, providing extremely high concentrations directly to the infected bone. This reduces the risk of toxicity to organs such as the liver and kidneys.
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The antibiotics slowly release into the bone
Antibiotic cement-coated nails are used to treat bone infections, also known as osteomyelitis. The nail is a thin cylindrical device made of metal that is inserted into the bone to stabilize it. Before insertion, the bone is washed, and the central marrow canal is reamed to remove any dead or infected bone tissue.
The antibiotic cement coating is prepared by mixing powdered antibiotic with orthopedic cement (polymethyl methacrylate), creating a viscous, play-dough-like substance. This mixture is then applied to the nail. The cement coating takes under five minutes to apply and hardens within 10 minutes.
Once the coated nail is inserted into the bone, the antibiotics slowly release into the surrounding bone tissue over a period of 4 to 6 weeks. This provides extremely high concentrations of antibiotics directly to the site of infection, maximizing their effectiveness while minimizing the risk of toxicity to organs such as the liver and kidneys.
The use of antibiotic cement-coated nails offers several advantages over traditional treatments for bone infections. It provides both local antibiotic administration and stabilization of bone defects in a single procedure. Additionally, the 3D printing technique allows for a customized nail that perfectly fits the patient's pulp cavity, improving the insertion and filling effect.
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Frequently asked questions
An antibiotic-coated nail is a piece of hardware used for the internal fixation or repair of broken or infected bones.
The nail is coated with a mixture of orthopedic cement and powdered antibiotic. This mixture forms a viscous, play-dough-like substance that treats infection internally. The antibiotics slowly leach out over 4-6 weeks, providing extremely high concentrations directly to the infected bone.
During surgery, the patient is placed under anesthesia. The central marrow canal of the bone is reamed to remove any dead or infected bone, then thoroughly washed. The nail is coated with the antibiotic mixture and inserted into the canal. Screws are placed at the top and bottom of the nail for stability, and incisions are closed with sutures or staples.
Antibiotic-coated nails are beneficial for patients with a history of infection, open fractures, or complex medical problems that place them in high-risk situations. They are also useful for those who are not ideal candidates for external fixation or do not want an external fixator.
