Repair of Forearm Muscle Herniation Using Local Fascial Flap: A Case Report

Forearm muscle herniation is a rare but known cause of symptomatic pain in the upper extremity caused by compression or strangulation of the muscle belly through a defect in the overlying fascia. Because of the rarity of this condition, optimal treatment is still widely unknown and debated. To date, there are various treatment methods published, including rest, physiotherapy, primary repair, fasciotomy, fascia lata inlay, onlay or wrap-around, mesh graft, and acellular porcine collagen matrix. In this study, a 61-year old man underwent an ulnar nerve transposition to correct cubital tunnel syndrome, resulting in subsequent symptoms of muscle herniation on the volar aspect of the forearm. Prominent muscle herniation was visible a few weeks after the onset of symptoms and surgical correction of the fascial defect was performed using a local fascial flap. Postoperatively, the patient's herniation symptoms resolved without signs of ulnar nerve entrapment. The rationale for this treatment option is discussed.