Midcarpal Instability (MCI) of the Wrist



Intrinsic Midcarpal Instability

Usually affects young, hypermobile patients.

It is due to progressive ligamentous attenuation or a congenital deficit.

The proximal carpal row is normally aligned or slightly extended, and when ulnar deviation of the wrist is performed, the large bone is subluxed dorsally.

When subluxating the large bone there is a reactive contraction of the wrist extensors (ECU, ECRB)

The distal carpal row returns to its usual position with an audible “clunk”.



Dr. Sergi Barrera @dr.sergibarrera



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