Ununited Anconeal Process (UAP)

This condition is most commonly diagnosed in German Shepherd Dogs and Bassett Hounds.

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What is an ununited anconeal process (UAP)?

Ununited anconeal process is a condition in which a bony protuberance within the elbow becomes detached from the ulna. This loose bony fragment causes pain and lameness and contributes to articular damage within the elbow joint.

What causes UAP?

This condition is most commonly diagnosed in German Shepherd Dogs and Bassett Hounds. It is a consequence of elbow incongruity (either ulnar notch incongruity or short ulna syndrome). In most dogs, this causes obvious lameness and pain. Achieving an optimal outcome depends on early diagnosis and treatment. 

How is UAP diagnosed?

Ununited anconeal process is most commonly diagnosed using simple radiography however in some subtle cases where the anconeal process remains loosely attached it is necessary to use computed topography (CT) to diagnose the condition.

How is UAP treated?

In dogs affected by ununited anconeal process (UAP), the best chance of achieving an excellent outcome is by reattaching the ununited anconeal process. This surgery is only appropriate in dogs in which diagnosis is made early and where the loose anconeal process has not changed shape. In chronic cases of UAP where the fragment has changed shape, the most appropriate treatment is usually anconeal process removal. Fitzpatrick Referrals have employed a unique type of screw for this purpose, in association with a proximal ulnar osteotomy (PUO), to allow the proximal ulna to move to a more favourable position relative to the humerus

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