A few options
Sharp pain in the periscapular area can be related to myofascial (muscle) strain , primarily rhomboid , serratus, and infraspinatus muscles.
If the pain radiates toward the front, consider intercostal neuralgia
(an irritation of the nerve
associated with each rib).
If the pain is at the upper shoulder blade radiating out toward the shoulder, it may be a suprascapular neuralgia.