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Tibial Dyschondroplasia, TD

Extracted From:
A Pocket Guide to
Poultry Health
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By Paul McMullin
© 2004
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A complex condition seen in chickens, turkeys and ducks. It may be associated with rapid growth and have a nutritional factor.


  • There are usually no signs unless the condition is severe.
  • Swelling and bowing in the region of the knee joints.
  • Lameness.

Post-mortem lesions

  • Plug of cartilage in proximal end of tibia, distal tibia, and proximal metatarsus, in decreasing order of frequency.
  • Microscopically - a mass of avascular cartilage with transitional chondrocytes, small ovoid lacunae and more matrix than normal.


Gross pathology; mild lesions may require histology to distinguish from other problems. Lixiscope may identify in vivo as early as 2 weeks of age. Differentiate from rickets.




Genetic selection using the Lixiscope to identify bone phenotype, modifications of calcium and phosphorus ratios, Vitamin D3 supplementation, chloride levels and acid/base balance.

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