Why does avascular necrosis cause scaphoid fracture?

Why does avascular necrosis cause scaphoid fracture?

Avascular necrosis is common complication of a scaphoid fracture (in around 30% of cases), with its risk increasing the more proximal the fracture. Non-union is the bone failing to heal properly, most commonly due to a poor blood supply.

What is nonunion scaphoid?

When the scaphoid bone is broken, it may not heal properly because it has a very fragile blood supply. Scaphoid fractures that do not heal are referred to as a scaphoid non-union. Ultimately, scaphoid non-unions can lead to loss of wrist motion and eventual wrist arthritis.

How long does it take to recover from scaphoid surgery?

The peculiarity of its blood supply is the primary reason for this prolonged healing period. Whereas other fractures in the upper extremity require an average of six weeks, a scaphoid fracture requires an average of 12 weeks if treated immediately, and as long as six months if the diagnosis is delayed.

How do you treat a scaphoid nonunion?

Nonoperative treatments of scaphoid nonunions include electrical or ultrasound bone stimulation combined with cast immobilization. Nonunion by conventional terms is a nonhealed scaphoid 6 months after injury, whereas a delayed union is a time frame that is less than 6 months.

What does a nonunion fracture feel like?

Symptoms of Nonunion Common symptoms of a nonunion fracture include pain, swelling, tenderness, deformity, and the inability to bear weight despite sufficient time since the break. There is a timeframe for fracture healing, and patients with a nonunion may continue to experience symptoms after several weeks.

What type of splint is used for scaphoid fracture?

Once there is clinical healing on radiographs, the immobilization phase is usually over. Typically a thumb spica orthosis is then used for comfort and protection. The 3pp Ez FIT ThumSpica Splint is ideal for protection of the wrist and thumb following a scaphoid fracture.

How do you diagnose a scaphoid fracture?

There are several different diagnostic modalities to detect a scaphoid fracture. These include conventional radiographs, computed tomography (CT scans), magnetic resonance examination, bone scintigraphy and sonograms.

What’s the worst bone to break?

Here are 10 of the worst bone fractures you could get.

• Skull.
• Wrist.
• Hip.
• Rib.
• Ankle.
• Pelvis. A fracture in the pelvis can be life-threatening, just like hip fractures.
• Tailbone. A tailbone fracture can make life difficult, and there is no way to hold the fractured tailbone in place.
• Elbow. A broken elbow is very painful.

How long are you in a cast after scaphoid surgery?

Scaphoid fractures tend to take longer to heal than other breaks. You may have to wear a cast or splint for up to 6 months. You will visit with your doctor throughout the recovery process, and the doctor may change recommendations based on how you’re healing.

How much displacement is needed for a pelvic osteotomy?

At least 2 cm displacement usually required (for each 2 cm displacement, load decreases by 13%) Robert B Salter (Canada) described osteotomy in 1961 (JBJS). Believes instability be secondary to the abnormal direction the acetabulum faces.

What are the surgical techniques for scaphoid nonunion?

Three techniques are recom- mended for surgical correction of scaphoid nonunion with bone graft and internal fixation with a screw: volar, dorsal, and dorsoradial. For scaphoid waist nonunion with a vi- able proximal pole, the volar ap- proach is used with interpositional wedge or inlay bone graft and screw fixation.

Which is most important part of pelvic osteotomies?

This is generally regarded as a salvage procedure. Assess the width of the shelf required by the amount needed to bring the CE angle out to normal (30-35 o) Placement of acetabular slot at the margin of the acetabulum is the most important part of the operation.

How is the diagnosis of a pelvic fracture made?

Diagnosis is made radiographically with pelvic radiographs and further characterized with CT scan. Treatment is typically operative fixation depending on degree of pelvis instability, fracture displacement and patient activity demands. Anterior SI joint diastasis. Posterior SI ligaments are intact.