From Dog

Polyarthrodysplasia is a rare congenital defect of dogs.

This condition is characterized by a number of skeletal disorders including congenital elbow luxation[1], ectrodactyly (congenital splitting of the limb), patellar luxation, hydrocephalus, retained testicle, deformed tail and Legg-Calve-Perthes disease (femoral head necrosis)[2][3].

Diagnosis is usually based on radiographic findings.

A differential diagnosis would include oculoskeletal dysplasia, which involves ocular defects as well as skeletal malformations.

Treatment is not recommended is severely affected dogs, but correction of femoral head necrosis and elbow luxation may be warranted.


  1. Fox MW (1964) Polyarthrodysplasia (congenital joint luxation) in the dog. J Am Vet Med Assoc 145:1204–1205
  2. Montgomery M & Tomlinson J (1985) Two cases of ectrodactyly and congenital elbow luxation in the dog. J Am Anim Hosp Assoc 21:781–785
  3. Montgomery RD et al (1993) What is your diagnosis? Congenital elbow luxation with avascular necrosis of the femoral head, pathologic fracture of the femoral neck and bilateral medial luxation of the patellas in a dog. J Am Vet Med Assoc 203(11):1535-1536