All About Bone Fillers - An Insight

Introduction

Bone filler or bone graft is a surgical procedure to fix broken bones or joints. Bone grafting or bone filler is used to correct bones that are damaged due to trauma or fracture. It is used to grow bone around implant devices in case of total knee replacement. Bone graft is a substance that is used to fill the area instead of bone and it also helps to provide structural stability. The bone graft can be from one’s own body or a donor. Bone grafts can also be completely synthetic. Read the article to know more.

What Is Known as a Bone Graft?

Bone grafts are bone fillers that fill the bone space and provide structural stability in case of a broken bone or joint. Bone fillers are used in case of many conditions such as fractured bone, spinal fusion, or infections. Bone fillers or bone grafts are used when the body fails to produce the required bone. Bone fillers are used to treat

• Fractures that do not heal properly.

• Certain bone defects such

  • Trauma.

  • Infection.

  • Benign cyst.

  • Benign tumor.

  • Birth defects.

  • Injuries.

  • Osteonecrosis (degenerative bone condition).

  • Joint issues.

  • Spinal fusion.

What Are the Various Types of Bone Filler?

Bone grafts are of different types. They can be biological from the same body, from a donor, or completely synthetic. Bone fillers should have many properties to be used as bone grafts. Usually, bones are porous and have tiny holes. Bone grafts should have similar gaps that encourage blood flow and provide nutrients which helps to enhance new bone growth. Those bone grafts that are re-absorbed quickly and those that do not break down easily should be used as bone fillers.

The main two types of bone fillers are

• Autograft: This type of bone filler is taken from the body, such as ribs, hips, wrists, and pelvis.

• Allografts: In this type of bone filler, the graft is taken from a deceased donor or a cleaned and preserved cadaver.

The type of bone filler used depends on the bone fracture. Allografts are usually used to treat hip, knee, or long bone fractures, which include arms and legs. An advantage of these bone fillers is that no additional surgery for incision is required; therefore, the risk of infection is reduced. At the same time, allografts are used in the region where bone has no living cells. This reduces the risk of rejection and infection. As no living cells are present, matching the donor and recipient blood groups is unnecessary.

Other bone fillers used are

• Demineralized Bone Matrix: This bone filler contains graft which has 93 % of collagen. This filler contains a growth factor that induces bone growth. One main advantage of this filler is that it can induce an immune response. Most of the doctors choose this filler instead of a complete bone substitute. This filler is used to treat certain fractures, like:

• A fracture that does not heal properly.

• Tumors and cysts.

• Cranioplasty (a surgical procedure that is performed in a defective skull).

• Platelet-Rich Plasma:

This filler reduces infection rate but cannot be used alone as a bone substitute.

• Hydroxide Appetite: Hydroxide appetite is a mineral in the bone and teeth, making them harder. Hydroxide appetite contains calcium phosphate.

• Corals: These fillers have porous structures similar to spongy bones. It helps bone repair. These fillers do not cause inflammation despite their low reabsorption rate.

Some synthetic fillers are

• Calcium Sulfate: Calcium sulfate, also called plaster of Paris or gypsum, has a structure similar to bone. This filler is used along with other grafts as it can reabsorb very quickly. This filler is used in case of fractures that do not heal properly and in case of hand fractures.

• Tricalcium Phosphate Ceramics: This is a type of ceramic bone filler that is used in case of

  • Fractures that do not heal properly.
  • Fractures that occur in long bones.
  • Hand surgery.
  • Cranioplasty.
  • Knee fractures.
  • Dental procedures.
  • Bioactive Glasses:

Bioactive form stronger bones with bone tissue and do not cause inflammation as they are porous. These are usually recommended for dental procedures and are not used in case of long bone fractures, as glasses are brittle.

• Polymer-Based Substitutes: These fillers do not induce new bone growth, so doctors usually do not recommend them.

How Is the Grafting Procedure Done?

The person will be given general anesthesia before starting the procedure. In the damaged region, the doctor will create incisions where the bone fillers are placed. Some extra tools, such as cables, screws, wires, pins, and plates, are used to position the grafts in place. The treated area will be closed using switches, and the person will be under observation for a few hours. The patient will be instructed with specific rules to be followed which helps to prevent infections.

What Is the Need to Perform Bone Grafting?

• Bone fillers or grafts are used in case of multiple fractures or in case of fractures that do not heal after initial treatment.

• Fusion is usually performed in the spine and helps the bone to heal correctly.

• Regeneration is recommended in case of injury, infection, or disease. This procedure involves using small or larger amounts of bone.

• Bone filler or graft is used around an implant device, promoting bone healing.

What Are the Risk Factors Associated With Bone Fillers?

Some common risks related to bone fillers or grafts are

• Bleeding.

• Infection.

• Reaction to anesthesia.

• Pain.

• Nerve injury.

• Swelling.

• Inflammation.

• Reabsorption of the bone filler.

• Rejection of the bone fillers.

• Reduced mobility.

How Is a Fractured Bone or Joint Recovered After Using Bone Fillers or Bone Grafts?

The recovery of a fractured bone depends on many factors, such as the severity and the region of the fractured bone, age, physical health, etc. The recovery time can be from two months to two years. Intake of a healthy diet and not smoking can help in speedy recovery. Pain medications are prescribed during the healing period. If there is a drain post-surgery, the doctor will provide instructions on how to care for them. The doctor will remove the drain on regular visits and promote healing.

Conclusion

Bone fillers or bone grafts fill the voids where the bone should be present. These fillers help in the healing process of a fractured bone. Bone fillers can be from the same body or donors or can be entirely synthetic. After considering the bone fracture, many forms of bone fillers are used.