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Hi, I am an American Board Certified Neurologist and I am very glad to help you with your health concerns.
Although without proper examination it is difficult to tell whether there is definitely any damage to the tendon however based on the information provided by you tendon damage cannot be entirely ruled out. Inability to fully lift the middle finger implies there is a possibility of damage to the tendon controlling the movements of the middle finger (more specifically the extensor tendon of the middle finger). An x ray cannot diagnose tendon injuries and you need an MRI of the hand/finger to identify a tendon damage. You may please ask your doctors to arrange for an MRI scan so that we can confidently rule in or rule out a tendon injury and then treated appropriately depending upon the final precise diagnosis.
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