Items tagged “wrist”
75 results
Article
Scaphoid non-union advanced collapse
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).
Pathology
I...
Article
Scapholunate advanced collapse
Scapholunate advanced collapse (SLAC), commonly known as SLAC wrist, refers to a pattern of wrist malalignment that has been attributed to post-traumatic or spontaneous osteoarthritis of the wrist. It is a complication that can occur with undiagnosed or untreated scapholunate dissociation. It is...
Article
Dinner fork deformity (wrist)
A dinner fork deformity, also known as a bayonet deformity, occurs as the result of a malunited distal radial fracture, usually a Colles fracture. The distal fragment is dorsally angulated, displaced and often also impacted. The term is descriptive, as the lateral view of the wrist is similar to...
Article
Piece of pie sign (wrist)
The piece of pie sign refers to an abnormal triangular appearance of the lunate on a PA image of the wrist representing either lunate dislocation or perilunate dislocation 1,2. A lateral image will help differentiate whether there is lunate or perilunate dislocation, with lunate dislocation demo...
Article
Spilt teacup sign (wrist)
The spilt teacup sign describes abnormal volar displacement and tilt of a dislocated lunate on lateral radiographs of the wrist 1,2. The convexity of the lunate is no longer in articulation with the distal radius while the concavity is no longer in articulation with the capitate. It is an import...
Article
Lunotriquetral coalition
A lunotriquetral coalition, also known as lunotriquetral fusion or synostosis, is a type of carpal coalition and represents a congenital lack of separation of the lunate and triquetral bones of the carpus.
Terminology
The term coalition is preferred over fusion for congenital coalitions, as d...
Article
Humpback deformity of the scaphoid
Humpback deformity of the scaphoid results from volar angulation of the proximal and distal poles of the scaphoid in the setting of scaphoid fracture through the waist 1. The dorsal component forms a 'humpback' which can be palpated.
It is important to identify as it can result in a progressive...
Article
Greater arc injury
Greater arc injuries are perilunate fracture-dislocations that are twice as common as lesser arc injuries, which are purely ligamentous perilunate dislocations 1. They account for ~5% of wrist fractures 1. The associated fractures may be trans-radial styloid, trans-scaphoid (most common 4), tran...
Article
Lesser arc injury
Lesser arc injuries are pure ligamentous perilunate dislocations. They are the "baby brother" of greater arc injuries, which have additional fractures of the radial styloid, scaphoid, capitate, triquetrum, and/or ulnar styloid 1.
Article
Trapezium fracture
Trapezium fractures are uncommon carpal bone injuries. They can either occur in isolation or combination with another carpal bony injury.
Epidemiology
Isolated fractures of the trapezium are only thought to account for 3-5% of all carpal fractures 1,2.
Pathology
They can be broadly classifie...
Article
Volar intercalated segment instability
Volar intercalated segment instability (VISI) is a type of carpal instability featuring volar tilt of the lunate. It is less often encountered than dorsal intercalated segment instability (DISI).
Clinical presentation
VISI presents in most cases with nonspecific wrist pain and a "clunking" wit...
Article
Capitohamate coalition
Capitohamate coalition represents the congenital fusion of the capitate and the hamate. It is the second most common type of carpal coalition after lunotriquetral coalition. It represents ~5% of all carpal fusions 1 and is associated with Apert syndrome 2.
Article
Anatomical snuff box
The anatomical snuff box (or sometimes known as tabatiere or fovea radialis of wrist) is a surface anatomy feature. It appears as a triangular depression on the lateral surface of the wrist on full extension of the thumb.
Gross anatomy
Boundaries
medial: tendons of the extensor pollicis longu...
Article
Accessory ossicles of the wrist (mnemonic)
The accessory ossicles of the wrist can be easily recalled with the mnemonics:
LOTTEO 1
HOTELS
Mnemonics
LOTTEO
L: lunula
O: os styloideum (carpal boss)
T: (os) triangulare
T: (os) trapezium secondarium
E: (os) epilunate
O: os hamuli proprium
HOTELS
H: (os) hamuli proprium
O: os tri...
Article
Accessory ossicles of the wrist
Accessory ossicles of the wrist are commonly seen on plain radiographs of the wrist and associated cross-sectional imaging. Over 20 were originally described 2, although the more common include 1:
lunula: between TFCC and triquetrum
os styloideum (carpal boss): on dorsal surface of 2nd or 3rd ...
Article
Triangular fibrocartilage complex
The triangular fibrocartilage complex (TFCC) is a complex structure that is a major contributor to the stability of the wrist.
Gross anatomy
The TFCC is located on the ulnar aspect of the wrist joint between the ulna and the lunate and triquetrum of the proximal carpal row. It has an elongate...
Article
Os triangulare
The os triangulare (also known as the os intermedium antebrachii or os triquetrum secundarium) is an accessory ossicle located between the ulnar styloid, lunate and triquetrum 1,2.
They may be unilateral or bilateral and the main differential diagnosis is non-union of an ulnar styloid process f...
Article
Os paratrapezium
Os paratrapezium is an accessory ossicle located between distal radial aspect of the trapezium and the base of the 1st metacarpal 1.
Differential diagnoses include loose bodies secondary to trapreziometacarpal joint osteoarthritis or secondary to trauma (e.g. Bennett's fracture) 2.
Article
Os radiostyloideum
Os radiostyloideum (or persistent radial styloid) is an accessory ossicle of the wrist located adjacent to the radial styloid process and lateral to the mid-portion of the scaphoid.
This should not be confused with another bony ossicle in the wrist, os styloideum (part of a carpal boss), which...
Article
Lunate
The lunate (os lunatum or semilunar) is one of the carpal bones and is a component of the proximal carpal row.
Gross anatomy
Osteology
The lunate is crescent-shaped with a proximal convex articular facet and a distal concave articular facet. On the medial surface is a square-shaped facet and ...
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