From the case:
Scapholunate advanced collapse (illustration)
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From normal, we see a widening of the scapholunate interval suggesting dissociation, over time, this leads to increase load over the radial aspect of the radioscaphoid joint causing osteoarthritic changes.
The increased load on this joint will cause eventually result in osteoarthritic changes throughout the entire radioscaphoid joint.
The increase in the scapholunate interval will allow the capitate to migrate proximally and ultimately cause degeneration of the capitulate joint and further displacement of the lunate ulnarward
Case Discussion
Stages of SLAC wrist from normal