A 17-year-old male presented with complaints of severe shoulder pain along with his left arm hanging by the side with some external rotation. The patient suffered a blow to his left arm while playing football. The doctor on duty ordered a radiograph of the injured site What is the most likely nerve injured?
Correct Answer: C
Description: 1st image shows the anterior dislocation of the shoulder. A- Suprascapular nerve B- Musculocutaneous nerve C- Axillary nerve D- Radial nerve The shoulder is the most commonly dislocated large joint of the body and is usually dislocated in an anterior direction. Typically, the dislocation is also inferior such that the humeral head is located inferior and lateral to the coracoid process. The humeral head will often have an infraglenoid and infraclavicular position. The diagnosis may be difficult to make. The typical mechanism consists in a violent force to the humerus that is abducted and externally rotated, resulting in extension of the joint. The humeral head is palpable, if not visible, in the deltopectoral triangle. First priorities are assessment of the neural and vascular integrity of the upper limb by testing motor and sensory functions of the fingers and palpation of the radial pulse. Other injuries that may accompany a shoulder dislocation include: - Strain on the tendons of the subscapularis and supraspinatus muscles Tears of the glenoid labrum Fracture of the greater tubercle of the humerus Trauma to the axillary nerve (as demonstrated by loss of sensation in the shoulder patch region over the deltoid muscle) Trauma to the axillary aery or its branches, such as the posterior circumflex humeral or subscapular aeries.
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