proximal row carpectomy

Kienbock's disease

Avascular necrosis & subsequent disintegration of lunate

50-75% history of trauma

Occasionally seen in sickle cell / steroid use

Trauma disrupting vascularity

- single incident with disruption of blood supply

SLAC Wrist

Scapho-lunate advanced collapse

- caused by malalignment of scaphoid on radius

- due to scapholunate disruption

Most common cause of wrist OA

1. Radio-scaphoid degenerative changes

- from abnormal flexion of scaphoid