Elbow Dysplasia is a complex condition where the elbow joint develops abnormally. It can be caused by a combination of genes and environmental factors such as exercise and early life experiences. Most diagnoses happen before the age of 2 years.
Elbow Dysplasia is the 'most common cause of forelimb lameness in young, large breed dogs' (source: Fitzpatrick Referrals)
The condition can cause pain and severe cases can lead to lameness.
Videos describing elbow dysplasia and the different kinds can be found on the Fitzpatrick Referrals website.