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Slipped tendon, also known as perosis, is a type of leg deformity that prevents the duck from bearing weight on the affected leg. If identified early enough when ducklings are still growing, and action is swiftly taken, sometimes the condition can be reversed, or at least improved. Slipped tendon is characterized by the enlargement of the hock joint, medial luxation of the Achilles tendon, and bending deformities of the mediotarsal and tarsal metatarsal bones.
Affected ducks may be seen having a difficult time walking, and continuously land with one foot on top of the other. Often ducks may present with a limp that worsens with time. In adult ducks, slipped tendons can often be misdiagnosed as sprains.
Hong, Cai, and Feng Zeguang Experimental Pathology of Manganese (Mn) deficiency and effects of higher phosphorus upon manganese deficiency in broiler ducks ACTA Veterinaria et Zootechnica sinica (1997)