Items tagged “dislocation”
11 results found
Article
Mayfield classification of carpal instability (perilunate instability)
Mayfield classification of carpal instability, also known as perilunate instability classification (carpal dislocations), describes carpal ligament injuries.
Instability has been divided into four stages 1-2:
stage I: scapholunate dissociation (rotatory subluxation of the scaphoid)
disruptio...
Article
Posterior dislocation of the hip
Posterior dislocations of the hip, although uncommon, are the most common direction of dislocation for this joint, outnumbering anterior dislocations 9:1.
Pathology
It most frequently occurs in the setting of significant trauma, given a large amount of force required. The most common scenario ...
Article
Lunate dislocation
Lunate dislocations are an uncommon traumatic wrist injury that require prompt management and surgical repair. The lunate is displaced and rotated volarly. The rest of the carpal bones are in a normal anatomic position in relation to the radius.
These should not be confused with perilunate disl...
Article
Scapholunate dissociation
Scapholunate dissociation, also known as rotary subluxation of the scaphoid, refers to an abnormal orientation of the scaphoid relative to the lunate and implies severe injury to the scapholunate interosseous ligament and other stabilizing ligaments.
Carpal dissociation implies carpal instabili...
Article
Terry-Thomas sign
The Terry-Thomas sign refers to an increase in the scapholunate space on an AP radiograph of the wrist (or coronal CT). The increased distance indicates scapholunate dissociation (often with rotary subluxation of the scaphoid) due to ligamentous injury. There is no consensus as to what measureme...
Article
Posterior shoulder dislocation
Posterior shoulder dislocations are far less common than anterior shoulder dislocations and can be difficult to identify if only AP projections are obtained. A high index of suspicion is helpful.
Epidemiology
Posterior shoulder dislocations account for only 2-4% of all shoulder dislocations (t...
Article
Upper extremity dislocations
Upper extremity dislocations are relatively common on account of the great range of motion the upper limb is capable of (a general principle is that the greater the range of motion of a joint, the more prone it is to dislocation). In many instances dislocations are associated with fractures eith...
Article
Lateral patellar dislocation
Lateral patellar dislocation refers to lateral displacement followed by dislocation of the patella due to disruptive changes to the medial patellar retinaculum.
Epidemiology
Patellar dislocation accounts for ~3% of all knee injuries and is commonly seen in those individuals who participate in ...
Article
Peritalar dislocation
Peritalar dislocation, also referred to as subtalar dislocation, involves the combined dislocation of the talocalcaneal/subtalar and talonavicular joints without the involvement of the tibiotalar and calcaneonavicular joints. It is generally associated with high-energy trauma and accounts for a ...
Article
V sign of interphalangeal joint dislocation
The V sign is characterized on a lateral radiograph of the digit by the separation of the dorsal base of the dislocated phalanx and the head of the phalanx proximal to the incongruent joint 1,2.
Before reduction, the V sign might be assessed to identify more subtle dorsal subluxations 1.
If th...
Article
Metacarpophalangeal joint dislocation
Metacarpophalangeal joint (MCPJ) dislocations are uncommon dislocations of the hand.
Epidemiology
Metacarpophalangeal joint dislocations account for ~3-5% of all dislocations 1,2.
The thumb is the most commonly affect digit, followed by the little finger 2.
Clinical presentation
The initial...
Unable to process the form. Check for errors and try again.