Mayfield classification of carpal instability (perilunate instability)
Scapholunäre
Dissoziation im Röntgenbild (nicht frisch) bei einem 76-jährigen. Der Abstand zwischen Lunatum und Scaphoid beträgt mehr als 4 mm, was als diagnostisches Kriterium gilt. Wegweisend ist auch der Unterschied zu den anderen Abständen zwischen den Karpalia.
Mayfield
classification of carpal instability (perilunate instability) • Trans-scaphoid perilunate dislocation - Ganzer Fall bei Radiopaedia
Mayfield
classification of carpal instability (perilunate instability) • Lunate dislocation - Ganzer Fall bei Radiopaedia
Mayfield classification of carpal instability, also known as perilunate instability classification (carpal dislocations), describes carpal ligament injuries.
Instability has been divided into four stages :
- stage I: scapholunate dissociation (rotatory subluxation of the scaphoid)
- disruption of the scapholunate ligament with resultant Terry Thomas sign
- exacerbated in clenched fist views
- stage II: perilunate dislocation
- the lunate remains normally aligned with the distal radius, and the remaining carpal bones are dislocated (almost always dorsally)
- the capitolunate joint is disrupted, and the lunate projects through the space of Poirier
- 60% are associated with scaphoid fractures
- stage III: midcarpal dislocation
- lunotriquetral interosseous ligament disruption or triquetral fracture
- neither the capitate or the lunate is aligned with the distal radius
- stage IV: lunate dislocation
- dorsal radiolunate ligament injury
- dislocation of the lunate in a palmar direction
- tipped teacup appearance
History and etymology
This classification was described by Mayfield et al. in 1980 .
Siehe auch:
- Gilula-Linien
- Terry-Thomas sign
- perilunäre Luxation
- Scapholunäre Dissoziation
- Lunatumluxation
- Luxation Mittelhandknochen
und weiter:
Assoziationen und Differentialdiagnosen zu karpale Luxationen:
