Musculocutaneous nerve is injured at the lateral cord of brachial plexus, positive clinical findings would be :
Musculocutaneous nerve supplies biceps and brachialis. It also gives sensory supply along the radial side of forearm. When it is damaged, it might show the following :

Flexion at elbow weakened (Biceps & Brachialis).
Supination of semiflexed elbow is affected (Biceps).
Sensory loss on radial side of forearm.
Loss of flexion at shoulder
Sensory loss on the radial side of the forearm
Loss of extension of forearm
Loss of extension of the wrist