All are true regarding brachial plexus injury,except -
Preganglionic lesions have a poor prognosis as these do not recover and are surgically irreparable. Post ganglionic lesions have better prognosis than preganglionic lesions and histamine test is useful in making the distinction - Apley
Preganglionic lesions have a better prognosis than postganglionic lesions
Erb' s palsy causes paralysis of the abductors and external rotators of the shoulder.
In Klumpke's palsy, Homer's syndrome may be present on the ipsilateral side
Histamine test is useful to differentiate between the preganglionic and postganglionic lesions