Avascular necrosis of the femoral head after femoral neck fracture.

What causes avascular necrosis of the femoral head?

These causes include fractures, dislocations, chronic steroid use, chronic alcohol use, coagulopathy, congenital causes; among many others. Avascular necrosis of the femoral head is a debilitating disease and is an important condition requiring healthcare professionals to be vigilant for its presentation.

Which fracture causes avascular necrosis?

Avascular necrosis (AVN) of the femoral head is a major complication after internal fixation of a femoral neck fracture and determines the functional prognosis. We investigated postoperative bone single-photon emission computed tomography/computed tomography (SPECT/CT) for assessing the risk of femoral head AVN.

What type of hip fracture is at risk for avascular necrosis?

The damage of the lateral epiphysial vessels is the most important cause of avascular necrosis of the femoral head. This complication occurs more often in intracapsular hip fractures then in extracapsular fractures.

Which bone is commonly associated with avascular necrosis?

The most common sites for AVN to occur are the femoral head, knee, talus, and humeral head. The hip is the most common location overall. [2] AVN less commonly occurs in other bones of the body, such as the carpus and jaw.

Avascular Necrosis, Blood Supply Femoral Head- Everything You Need To Know - Dr. Nabil Ebraheim

What is the name of a common complication of fractures when blood supply to the bone is interrupted?

Osteonecrosis. When blood flow to a bone is disrupted, part of the bone may die, resulting in osteonecrosis. Osteonecrosis can be caused by an injury or can occur spontaneously. Typical symptoms include pain, limited... read more .

What is the most common cause of necrosis?

Necrosis is caused by a lack of blood and oxygen to the tissue. It may be triggered by chemicals, cold, trauma, radiation or chronic conditions that impair blood flow. 1 There are many types of necrosis, as it can affect many areas of the body, including bone, skin, organs and other tissues.

Why does femoral neck fracture cause avascular necrosis?

Trauma-induced avascular necrosis of the femoral head represents the most common femoral head aseptic necrosis. An alteration in blood supply to the femoral head is the cause of the vascular necrosis. Another mechanism in the genesis of femoral head necrosis is the tamponade effect.

Which type of hip fracture has the highest risk for avascular necrosis and nonunion?

One of the most serious sequelae of femoral neck fractures (FNFs) is avascular necrosis (AVN) and nonunion, and this translates to a significant morbidity and mortality.

What is femoral head fracture?

Femoral head fractures occur almost exclusively as a result of a traumatic hip dislocation. Treatment is typically an emergency and includes the reduction of the dislocated hip under anesthesia. As a rule, the earlier the reduction, the better the outcome.

What causes avascular necrosis?

Avascular necrosis is a disease that results from the temporary or permanent loss of blood supply to the bone. It happens most commonly in the ends of a long bone. Avascular necrosis may be the result of injury, use of medicines, or alcohol. Symptoms may include joint pain and limited range of motion.

What is subtrochanteric femur fracture?

Subtrochanteric (ST) femur fractures are defined as fractures of the proximal femur that occur within 5 cm of the lesser trochanter. ¹. Overall, the incidence of these fractures has been estimated to be approximately 15–20 per 100,000 individuals.

What causes bone necrosis?

Excessive Alcohol and Tobacco Use

Overuse of alcohol can cause fatty substances to build up in the blood vessels and can increase cortisol (hormone that can cause blood vessels to narrow) levels in the blood. Together, these may decrease blood flow to the bone and lead to osteonecrosis.

What are the 2 most common mechanisms of injury for a hip dislocation?

Anterior hip dislocations are usually caused by forceful abduction with external rotation of the thigh and most commonly following a motor vehicle accident or fall.

What happens avascular necrosis?

Avascular necrosis is a disease that results from the temporary or permanent loss of blood supply to the bone. It happens most commonly in the ends of a long bone. Avascular necrosis may be the result of injury, use of medicines, or alcohol. Or it may occur after bone injury or bone surgery.

What is transcervical fracture?

a fracture through the neck of the femur.

What is Greenstick fracture?

A greenstick fracture occurs when a bone bends and cracks, instead of breaking completely into separate pieces. The fracture looks similar to what happens when you try to break a small, "green" branch on a tree. Most greenstick fractures occur in children younger than 10 years of age.

What is Subcapital fracture?

Subcapital fracture is the most common type of intracapsular neck of femur fracture. The fracture line extends through the junction of the head and neck of femur.

What is the most common type of hip fracture?

Intertrochanteric and femoral neck fractures are the most common types of hip fracture. Femoral head fractures are extremely rare and are usually the result of a high-velocity event. The areas of the femur (thighbone).

Which type of fracture involves a break through only part of the cross section of the bone?

A complete fracture involves a break across the entire cross-section of the bone and is frequently displaced. Incomplete fracture. An incomplete fracture involves a breakthrough only part of the cross-section of the bone.

How is AVN of the hip diagnosed?

An MRI is considered the gold standard for diagnosing AVN of the hip because it can detect the disease more quickly than radiography. It has a sensitivity of more than 99%, can detect crescent signs earlier, and is capable of detecting bone marrow changes including edema and sclerosis sooner than plain radiographs.

What are the 4 types of necrosis?

These are coagulative, liquefactive, caseous, gangrenous which can be dry or wet, fat and fibrinoid. Necrosis can start from a process called “oncosis”.

How is avascular necrosis of the femoral head treated?

In early stages of AVN (precollapse), core decompression with or without bone graft is typically considered the most appropriate treatment. In late stages, characterized by collapse, femoral head deformity, and secondary osteoarthritis, total hip arthroplasty is the most appropriate treatment.

Why do most fractures occur at the middle third of the femur?

The area most susceptible to stress fractures is the medial junction of the proximal and middle third of the femur. Fractures in this location occur as a result of the compression forces on the medial femur.

What is oblique bone fracture?

Oblique fractures occur when your bone is broken at an angle. The fracture is a straight line that's angled across the width of your bone. They're usually caused by landing on your bone at an angle after a fall, or when your bone is hit suddenly from an angle (like in a car accident).