o'driscoll

Definition

Radius rotates externally in relation to the ulna

- posterior displacement of the radial head relative to the capitellum

- in flexion

Anatomy LCL

Background

The coronoid is the most important portion of ulno-humeral articulation

Reasons

1.  Provides anterior buttress

2.  Anterior capsule and brachialis attach to coronoid

2.  Anterior band of the MCL attaches to it

- distally and medially on sublime tubercle