Scaphoid non-union advanced collapse (SNAC) is a complication that can occur with scaphoid fractures, specifically non-union of scaphoid fractures.It is essentially the same sequela of wrist injury causing scapholunate dissociation as seen in scapholunate advanced collapse (SLAC).

The scapholunate is an interosseous carpal ligament that provides stability to the proximal carpal row. It consists of dorsal, proximal and palmar segments that bridge the scaphoid and lunate. When the ligament complex tears, the scaphoid tends to flex while the lunate extends, creating translational and rotational instability between the two.

The three UVA Professor, Dr. Nicole Deal, presents a surgical technique for repair of a scapholunate ligament disruption. Reduction and Association of the Scaphoid and the Lunate for Scapholunate Instability Joseph M. Lombardi James A. Wilkerson Melvin P. Rosenwasser DEFINITION Scapholunate instability occurs as a result of injury to the scapholunate interosseous ligament (SLIL) and represents the most common type of carpal instability. The treatment of scapholunate dissociation remains controversial. Although good to excellent results have been reported using a variety of surgical techniques, they have often not been confirmed by other authors. Limited wrist mobility and the likelihood that degenerative changes will progress appea … 2003-09-15 · INTRODUCTION: The aim of this study was to investigate the clinical consequences of scapholunate dissociation associated with fractures of the distal radius and the impact on wrist function. Fractures of the distal radius and scapholunate dissociation overlap in pathomechanics.

It consists of dorsal, proximal and palmar segments that bridge the scaphoid and lunate. When the ligament complex tears, the scaphoid tends to flex while the lunate extends, creating translational and rotational instability between the two. The scapholunate angle is the angle between the long axis of the scaphoid and the mid axis of the lunate on the sagittal imaging of the wrist. In a normal situation, it should be between 30 and 60 o in the resting (neutral) position. The scapholunate angle is abnormal in carpal instability: increased in scapholunate dissociation Widening of the scapholunate joint space >3mm Known as Terry-Thomas sign (or David Letterman sign) Rotary subluxation of the scaphoid Lateral view: Scapholunate angle >60 degrees; PA view: Cortical ring sign (circular cortex of the bone is more prominent) Dorsal intercalated segment instability A needle was inserted into the right radioscaphoid joint. Iodinated contrast mixed with gadolinium was injected into the right radioscaphoid joint.

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When the ligament complex tears, the scaphoid tends to flex while the lunate extends, creating translational and rotational instability between the two. Scapholunate dissociation: Involves a complete tear of the SLIL with additional tear of 1 or more secondary ligaments.

Widening of the scapholunate joint space >3mm Known as Terry-Thomas sign (or David Letterman sign) Rotary subluxation of the scaphoid Lateral view: Scapholunate angle >60 degrees; PA view: Cortical ring sign (circular cortex of the bone is more prominent) Dorsal intercalated segment instability

In this episode, we review the high-yield topic of Scapholunate Ligament Injury & DISI from the Hand section. --- Send in a voice message: https://anchor.fm/orthobullets/message – Listen to Hand⎪Scapholunate Ligament Injury & DISI by The Orthobullets Podcast instantly on your tablet, phone or browser - no downloads needed. 2019-08-19 · Scapholunate dissociation can also be chronic secondary to arthritic changes when there is no history of recent trauma.

This diagnosis, however, is based on the assumption that scapholunate dissociation is caused only by trauma. In questioning this assumption, we pres … scapholunate dissociation causes the scaphoid to flex palmar and the lunate to dorsiflex if left untreated the DISI deformity can progress into a SLAC wrist DISI deformity may also develop secondary to distal pole of the scaphoid excision for treatment of STT arthritis A condition of progressive instability causing advanced arthritis of radiocarpal and midcarpal joints. describes the specific pattern of degenerative arthritis seen in chronic dissociation between the scaphoid and lunate.
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2) VIDEOS - only Orthobullets Technique Videos count. In this episode, we review the high-yield topic of Scapholunate Ligament Injury & DISI from the Hand section. --- Send in a voice message: https://anchor.fm Scapholunate advanced collapse (SLAC) Scapholunate Dissociation. There is increased distance of greater than 5 mm (black arrow) between the scaphoid (S) and the lunate (L) producing the so-called Terry Thomas or David Letterman sign.

In this episode, we review the high-yield topic of Scapholunate Ligament Injury & DISI from the Hand section. --- Send in a voice message: https://anchor.fm/orthobullets/message CARPAL INSTABILITY DISSOCIATIVE DISI-DORSAL INTERCALATED SEGMENT INSTABILITY SCAPHOLUNATE DISSOCIATION OR ROTARY SUBLUXATION OF SCAPHOID SL GAP > 3mm ON PA VIEW (TERRY THOMAS SIGN) BREAK IN GILULA’S ARC AT THE SL INTERVAL CORTICAL RING SIGN SL ANGLE > 60 Degrees RL ANGLE > 15 Degrees Watsons test – palpable clunk on Radial or Ulnar deviation Scapholunate injury (or scapholunate dissociation, SLD) is one of the most common and significant ligament injury of the wrist. (another common wrist ligament tear is TFCC injury ) It usually occurs when the wrist is twisted with loaded hyperextension and ulnar deviation (wrist moving towards little finger), such as falling onto an outstretched hand (so called FOOSH ) in skiing or motorcycle The scapholunate angle is the angle between the long axis of the scaphoid and the mid axis of the lunate on the sagittal imaging of the wrist. In a normal situation, it should be between 30 and 60 o in the resting (neutral) position.
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Scapholunate instability is a spectrum of wrist instabilities that have occult Often the term is used interchangeably with scapholunate dissociation but in a strict

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Reference: Team Orthobullets (D) MD. 2. Answer _C_. After further Can cast immobilization successfully treat scapholunate dissociation associated with distal

In questioning this assumption, we pres … scapholunate dissociation causes the scaphoid to flex palmar and the lunate to dorsiflex if left untreated the DISI deformity can progress into a SLAC wrist DISI deformity may also develop secondary to distal pole of the scaphoid excision for treatment of STT arthritis A condition of progressive instability causing advanced arthritis of radiocarpal and midcarpal joints.

scapholunate dissociation causes the scaphoid to flex palmar and the lunate to dorsiflex if left untreated the DISI deformity can progress into a SLAC wrist DISI deformity may also develop secondary to distal pole of the scaphoid excision for treatment of STT arthritis

Pathoanatomy. intercarpal injury (scapholunate or lunotriquetral dissociation) medical condition. associated injuries to other organ systems very common due to high energy mechanism of these injuries.

Tech Hand Up Extrem Surg. 1998, 2: 18–24. Dissociation. Perilunate dislocations are pure ligamentous injuries. They result from high-energy trauma. They may lead to severe disruption of carpal.