The gastrocnemius muscle attaches the upper limb to the point of the hock. If it is ruptured, a major part of the support of the limb is lost. The limb simply folds (the hock flexes) when the horse bears weight.
The injury associated with this diagnosis is usually a deep laceration above the point of the hock on the rear of the limb which cuts through the muscle. The muscle or tendon can also be ruptured from trauma without breaking the skin.
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Prognosis & Relevant Factors
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QUESTIONS TO ASK MY VET