Dat bird is walking funny (do birds even walk?)

Question 1

What are the differentials for a bird that is sitting on its hocks, no obvious lesions on its legs and no obvious pain

Answer 1

Spondylolisthesis and osteomyelitis of the thoracic spine

Question 2

What causes femoral head necrosis?

Answer 2

Bacteria or virus

Question 3

What disease presents as a bird that is hopping lame with a palpable thickening of the gastrocnemius tendon above the hock joint?

Answer 3

Hock infection with tendon rupture

Question 4

What disease presents as low grade pain and might instigate FSA involvement?

Answer 4

Pododermatitis