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Slipped tendon is the common name for perosis, which is referred to medically as luxation of the Achilles (gastrocnemius) tendon. It 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 through providing support and stabilization of the hock through splinting. It may easily be confused with splay leg, however with splay leg, the whole leg deviates rather than just at the hock. Rickets may also be mistaken for slipped tendon in ducklings, however with rickets, it is caused by the long bone deformity, not tendon displacement.
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)