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.
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.