Upper (C5-C6)-Erb's Palsy
This type of brachial plexus injury results in paralysis of the deltoid, biceps, brachioradialis, supraspinatus, infraspinatus, and subscapularis muscles. This results in areflexia of the biceps and brachioradials reflexes, sensory loss in the lateral shoulder and upper arm and radial side of the forearm. In infants, this is caused by breech presentation or overstretching of the neck. Recovery is poor-only 1/3 of Erb's palsy patients regain full motion.