What is a common symptom of nerve entrapment in the suprascapular notch?

• A. Pain in the shoulder only
• B. Weakness in shoulder adduction
• C. Atrophy of both supraspinatus and infraspinatus
• D. Limited range of motion in the elbow

Answer: (C)

The presence of atrophy in both the supraspinatus and infraspinatus muscles is a classic symptom of nerve entrapment at the suprascapular notch, specifically involving the suprascapular nerve. This nerve innervates these two muscles, which are key to shoulder stability and function. When the nerve is entrapped, it can lead to ischemia and subsequent atrophy of the muscles it supplies, resulting in weakness and potentially altered shoulder mechanics.

The supraspinatus muscle is primarily responsible for initiating shoulder abduction, while the infraspinatus contributes to external rotation of the shoulder. Both functions are crucial for various activities involving the arm. Atrophy of these muscles not only reflects muscular dysfunction but can also be observable during a physical examination, where asymmetry may be noted in the shoulder region.

The other options do not adequately represent the typical symptoms associated with this specific type of nerve entrapment. While pain may occur, it is more generalized and not limited solely to the shoulder, and weakness in shoulder adduction is not primarily linked to suprascapular nerve issues. Limited range of motion in the elbow is irrelevant to suprascapular nerve entrapment and therefore does not correspond to the symptoms typically seen