What is the AVN of the scaphoid?
Idiopathic avascular necrosis (AVN) of the scaphoid was first described by Georg Preiser in 1910 (1-3). It is a rare condition that can cause pain and sometimes swelling around the anatomical snuffbox, which may be associated with loss of strength and reduced range of motion in the wrist (4).
What leads to avascular necrosis of the scaphoid?
Complications may include nonunion of the fracture, avascular necrosis of the proximal part of the bone, and arthritis. Scaphoid fractures are most commonly caused by a fall on an outstretched hand….
|Causes||Fall on an outstretched hand|
|Diagnostic method||Examination, X-rays, MRI, bone scan|
How fast does avascular necrosis progress?
AVN has four stages that can progress over a period of several months to more than a year. In Stage I, the hip is healthy; in Stage II, the patient experiences mild pain in direct proportion to the deterioration of the head of the femur (or ball of the hip joint).
What motion would cause pain and be indicative of a scaphoid fracture?
Scaphoid fractures usually cause pain and swelling in the anatomic snuffbox and on the thumb side of the wrist. The pain may be severe when you move your thumb or wrist, or when you try to pinch or grasp something.
What happens if a scaphoid bone dies?
Avascular necrosis occurs when part of the scaphoid bone dies because of the loss of blood flow. This can eventually result in fragmentation and the collapse of the bone. Its presence also makes repair of the scaphoid much more difficult.
What are the symptoms of a scaphoid fracture?
Scaphoid fractures usually cause pain and swelling in the anatomic snuffbox and on the thumb side of the wrist. The pain may be severe when you move your thumb or wrist, or when you try to pinch or grasp something. Unless your wrist is deformed, it might not be obvious that your scaphoid bone is broken.