Ulnar translocation results from ulnar migration of the carpus along ulnar inclination of the distal radius.
There are two types of ulnar translocations
Type I – Complete ulnar translocation of the carpus, sparing the scaphoid which maintains its normal elation to the carpus.
Type II – Associated with scapholunate dissociation, lunotriquetral dissociation and other forms of perilunate disability.
This pattern of instability has been well recognized in patients with rheumatoid arthritis as a result of articular erosions and attenuation of wrist ligaments.
It may also occur following trauma, madelung deformity, malunited distal radius with increased ulnar inclination, iatrogenic excision of distal ulna, lunate surgery for Keinbochs
There is an ulnar offset of the hand.
Xray shows lunate just distal to the ulna and a large space between the radial styloid and the scaphoid.
Radiocarpal joint deteriorationmay be noted in chronic cases.
- Repair of radiopalmar ligaments in acute cases.
- Relocation of the carpus and Radiolunate or radioscapholunate fusion.
Chronic Cases« Back to Glossary Index