Radial nerve at Frohse's arcade: a new technique of release under total ultrasound guidance. First experience.

Radial nerve compression at the arcade of Frohse is a rare but significant condition that typically presents with pain primarily after exertion and at night on the dorsal side of the forearm, more distally than tennis elbow pain, and weakness of the wrist extensors and the long fingers and thumb extensors. Traditional treatment often involves open surgery, resulting in significant scarring. This study introduces a novel percutaneous radial nerve release technique under complete ultrasound guidance and highlights its efficacy and safety. The procedure involves identifying the entry point, lateral of the radial nerve, allowing for targeted release of the superficial fascia surrounding the supinator muscle without damaging nearby vascular or nerve structures. A cadaveric study was performed on ten fresh-frozen specimens to validate the entry point and route, which successfully demonstrated complete fascial release without complications. Preliminary clinical results from five patients showed complete resolution of symptoms associated with radial tunnel syndrome with no reported complications. The technique results in a significantly smaller incision (<1 cm) compared to traditional methods (up to 10 cm) and can be performed under WALANT anesthesia, making it suitable for the outpatient setting. This approach offers a minimally invasive alternative for patients with isolated posterior interosseous nerve compression and highlights the importance of ultrasound guidance in achieving optimal results. Because the technique requires a learning curve, it is recommended for surgeons with experience in ultrasound-guided procedures.