Branches also provide natural give when birds land. Also try open wicker nest baskets and small platforms for the bird to sit on. If your handicapped bird lives with other birds, provide extra food and water dishes, since handicapped individuals do not compete effectively. Try a variety of dishes, so you can identify the types your bird uses most easily. Any finch with handicapped legs or feet needs frequent nail trims, because nails on disabled limbs may receive little natural wear.
Long nails can easily catch, causing further injuries.
A handicapped bird must be protected, because it cannot afford more physical damage. Peg and Pete, two one-legged society finches I rescued, each lost a leg while caged beside lovebirds in a pet shop. They are doing well in a mixed flight with special platforms for perching. At first, they shared a nest with two other societies. These societies laid eggs in the nest, then moved out, leaving fertile eggs for Peg and Pete.