Tibial Dyschondroplasia

In tibial dyschondroplasia, a persistent mass of hypertrophic cartilage is seen in the proximal end of the tibiotarsal bone in growing broiler chickens and turkeys. Tibial dyschondroplasia, cartilaginous core, chicken Tibial dyschondroplasia, degrees of severityIn many birds, the abnormal cartilage is restricted to the posterior medial portion of the proximal tibiotarsal bone, and birds are clinically normal. An incidence of 10-30% of subclinical dyschondroplasia is common in many rapidly growing flocks 3-6 wk old . In more severe cases, the abnormal cartilage occupies the whole metaphysis of the proximal tibiotarsal bone and also develops in the proximal tarsometatarsal bone. Birds with these more severe lesions may be lame, with bowing of the proximal metatarsus or backward bending of the proximal tibiotarsus. In some instances, fractures or avascular necrosis occur below the abnormal cartilage. The incidence of tibial dyschondroplasia is affected by genotype and by the calcium/phosphorus ratio and acid-base balance of the diet. This defect can be produced experimentally with a variety of toxins.

See Also:
Disorders Of The Skeletal System: Introdcution
Crooked Toes
Epiphyseal Separation
Femoral Head (or Long Bone) Necrosis
Rotated Tibia
Shaky-Leg Lameness or Syndrome
Valgus and Varus Deformation of the Intertarsal Joint

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