Orthopaedics

All are true regarding brachial plexus injury,except -

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