Non-anatomical bony block
- transfer of coracoid process through subscapularis
- dynamic anteroinferior musculotendinous sling
- provides subscapularis tenodesis
- preventing lower portion from displacing proximally as arm abducted
- when shoulder in vulnerable position abduction and ER
Dorsal
- most common
Volar
1. Acute traumatic peripheral tear TFCC with DRUJ dislocation
- usually major trauma
- dorsal or volar
2A. Distal radial fracture
Patients usually complain of subluxation rather than dislocation
- rarely requires reduction
Different entity to acute posterior dislocation usually
Rare
1. Ligamentous laxity > 50%
- commonly associated with MDI
- posterior only 20%
- posterior & inferior 20%
Instability in at least 2 planes
- postero-inferior
- antero-inferior
- antero-postero-inferior
Recognised as a common problem
- often misdiagnosed
Most patients athletic