This positive variance can be congenital1 or acquired2 radial shortening secondary to trauma—for example, a malunion of the radius after a distal radius fracture, an Essex-Lopresti injury, proximal migration of the radius after radial head excision, or premature physeal closure of the radius.
Does positive ulnar variance require surgery?
Ulnar shortening osteotomies are a group of procedures that are performed for symptomatic positive ulnar variance which is often a complication of distal radial fractures. USO is the gold standard for the treatment of such complications.
What does it mean to be ulnar positive?
Description: A determination of distal ulnar length in comparison to distal radial length. Radial length normally exceeds the ulna. If the ulna projects beyond the distal edge of the radius it is referred to as Positive Ulnar Variance. Negative ulnar variance refers to an ulna which is shorter than the radius.
What is the significance of ulnar variance?
The importance of ulna variance was confirmed and considered as a main prognostic factor for instability in distal radial fractures14. Just 1 mm change usually brought an increase in the mechanical load through the ulna by more than 25%.
What is a complication of a positive ulnar variance?
On the contrary, a long ulna (positive ulnar variance) is harmful for the ulnar compartment of the wrist as it causes degeneration and perforation of the triangular fibrocartilage complex (TFCC) and cartilaginous wear of the carpal bones (ulnar impaction syndrome).
How do you fix ulnar impaction syndrome?
Conservative treatment should be attempted before surgery and can include immobilization for 6-12 weeks, NSAIDs, corticosteroid injection and limiting aggravating movements such as pronation, gripping and ulnar deviation. Lack of improvement with conservative management is an indication for surgery.
What happens when your ulna bone is too long?
Ulnar impaction syndrome is a condition in which one of the forearm bones (ulna) is too long relative to the other (radius). This results in excessive pressure on the ulnar side of the wrist and causes pain, and wear and tear.
Is ulnar shortening worth it?
This procedure has been the standard treatment for ulnar impaction syndrome for many years. Recent biomechanical studies have confirmed that an ulnar shortening osteotomy can improve the stability of the ulnar carpus and distal radioulnar joint (DRUJ).
What is positive ulnar variance wrist?
Positive ulnar variance describes where the distal articular surface of the ulna is more than 2.5mm distal to the articular surface of the radius. It plays important role in wrist pathology such as ulnar impaction syndromes and thinning of the triangular fibrocartilage complex.
Is ulnar impaction syndrome serious?
This causes inflammation on the ulnar, or little-finger side, of the hand, and consequently, pain and swelling in the wrist. UIS is a degenerative wrist condition. Oftentimes, degenerative problems are irreversible as well as progressive. Fortunately, ulnar impaction syndrome is curable and treatable.
What causes ulnar impingement?
Most commonly, the syndrome is caused by surgical resection of the distal ulna as part of the management of wrist trauma, rheumatoid arthritis, or Madelung deformity. Less commonly, ulnar impingement may occur in de novo negative ulnar variance.
How is ulnar variance diagnosed?
To determine ulnar variance on radiographs, the generally accepted standard view is a posteroanterior view obtained with the wrist in neutral forearm rotation, the elbow flexed 90° and the shoulder abducted 90°.
What is normal ulnar variance?
– mean ulnar variance is 0.9 mm (range: 4.2 to 2.3 mm); – functional anatomy: – w/ neutral variance, 80% of load is born by radius and 20% by ulna; – 2.5 mm increase in ulnar varience will increase load borne by ulno-carpal joint from 18% to 42%;
What is ulnar shortening surgery?
Ulnar shortening surgery also known as ulnar osteotomy is a surgery where a section of the ulna bone is cut out in order to shorten the length of the ulna bone. The ulna is one of two bones in the forearm. It is the smaller of the two and located on the pinky side (ulnar) of your forearm.
Does negative ulnar variance cause pain?
Signs & Symptoms
These changes may produce pain, swelling, tenderness, thickening and/or stiffness in the overlying tissues of the wrist. The range of motion may become restricted. Many individuals with Kienböck Disease have a shorter ulna than radius (negative ulnar variance).
How do you know if you have ulnar impaction syndrome?
A manual examination that includes palpation, range of motion and strength measurement is primarily used to determine the likelihood of ulnar impaction syndrome. However, a radiograph or MRI is a more conclusive means of diagnosing the condition.
What is ulnar wrist pain?
Ulnar wrist pain is pain on the side of your wrist opposite the thumb. This pain can vary, depending on the cause. It may worsen when you grip something or twist your wrist. Ulnar wrist pain can be hard to diagnose because it can be linked to many different types of injuries.
