Abstract
Background:
Suprascapular nerve (SSN) block using bone reference points (BARO) is a technique that in principle is accessible to practitioners without experience in locoregional anesthesia or ultrasound guidance. The primary objective was to validate the feasibility of SSN BARO by an orthopedic surgeon. The secondary objective was to provide a description of the path of the sensory branches from the SSN to the shoulder.
Methods:
A BARO was performed on 15 cadaveric shoulders by an intern in orthopedic surgery. Ten ml of methylene blue and 0.75% ropivocaine were injected around the SSN. 2.5ml of a red latex solution were also injected to identify the injection site. The distribution of the sensory branches of the NSS was also described.
Results:
The average distance between the SSN and the injection site was 1.5cm (0-4.5cm). The most frequent injection site was the proximal third of the scapular neck. Fifteen SSNs were marked upstream of the origin of the sensory branches. The 15 SSN produced 3 sensory branches that innervate the posterior glenohumeral capsule, the subacromial bursa, and the coracoclavicular and acromioclavicular ligaments.
Conclusion:
SSN BARO by an orthopedic surgeon is a simple, reliable, and accurate technique. Injection near the suprascapular notch is recommended to mark the SSN upstream of its three sensory branches.