Читать книгу Musculoskeletal Disorders - Sean Gallagher - Страница 46

Cubital tunnel syndrome is the second most common mononeuropathy of the upper extremity (Cutts, 2007; Saito et al., 2018). It involves the entrapment of the ulnar nerve within the cubital tunnel at the elbow, which is of clinical significance since the ulnar nerve is one of the primary nerves supplying motor information to many forearm muscles and most of the hand muscles and sensory information from part of the hand. In addition to compression within the cubital tunnel, the ulnar nerve can also be compressed in the neck at cervical level 8 (C8), in the thoracic outlet (thoracic outlet syndrome), and at the wrist in Guyon’s canal (Fadel, Lancigu, Raimbeau, Roquelaure, & Descatha, 2017). A double crush syndrome is possible and would mean that the ulnar nerve is compressed in two or more of these various sites. Symptoms of cubital tunnel syndrome at any level of entrapment can lead to an intermittent altered sensation in the little and ring fingers, such as sensory loss (typically the first reported symptom), paresthesia (a burning or prickling sensation), or formication (the sensation of having insects crawling on or under the skin) (Fadel et al., 2017). As the condition progresses, there may be development of pain in the medial elbow and hand weakness, and eventually, atrophy of many of the intrinsic muscles of the hand.