1/16. ulnar nerve injuries of the hand producing intrinsic muscle denervation on magnetic resonance imaging.Muscle and nerve injuries in the hand may be difficult to detect and diagnose clinically. Two cases are reported in which magnetic resonance imaging showed ulnar nerve injury and intrinsic hand muscle denervation. The clinical, anatomical and radiological features of injury to the deep motor branch of the ulnar nerve and associated muscle denervation are discussed and illustrated.- - - - - - - - - - ranking = 1keywords = muscle (Clic here for more details about this article) |
2/16. ulnar nerve compression by an anomalous muscle following carpal tunnel release: a case report.We describe the acute development of ulnar nerve compression following carpal tunnel release in a patient with an accessory palmaris longus muscle. Although anomalous muscles in the wrist are relatively common and may produce ulnar nerve compression, this particular occurrence following carpal tunnel release has not been previously described in the literature. We theorize that the compression of the ulnar nerve proximal to Guyon's canal was caused by increased tension along the long axis of the anomalous accessory palmaris longus muscle as a consequence of transverse carpal ligament division.- - - - - - - - - - ranking = 1.1666666666667keywords = muscle (Clic here for more details about this article) |
3/16. Ulnar tunnel syndrome--an unusual cause.We describe a case of anomalous muscle belly at Guyon's canal causing ulnar tunnel syndrome with sparing of the motor branch and hypothenar muscles.- - - - - - - - - - ranking = 0.33333333333333keywords = muscle (Clic here for more details about this article) |
4/16. ulnar nerve entrapment in Guyon's tunnel by an anomalous palmaris longus muscle with a persisting median artery.A case of ulnar nerve entrapment in Guyon's tunnel caused by an aberrant palmaris muscle, associated with a patent median artery and duplication of the median nerve, is reported.- - - - - - - - - - ranking = 0.83333333333333keywords = muscle (Clic here for more details about this article) |
5/16. Handlebar palsy--a compression syndrome of the deep terminal (motor) branch of the ulnar nerve in biking.We describe 3 patients who developed a severe palsy of the intrinsic ulnar supplied hand muscles after bicycle riding. Clinically and electrophysiologically all showed an isolated lesion of the deep terminal motor branch of the ulnar nerve leaving the hypothenar muscle and the distal sensory branch intact. This type of lesion at the canal of Guyon is quite unusual, caused in the majority of cases by chronic external pressure over the ulnar palm. In earlier reports describing this lesion in bicycle riders, most patients experienced this lesion after a long distance ride. Due to the change of riding position and shape of handlebars (horn handle) in recent years, however, even a single bicycle ride may be sufficient to cause a lesion of this ulnar branch. Especially in downhill riding, a large part of the body weight is supported by the hand on the corner of the handlebar leading to a high load at Guyon's canal. As no sensory fibres are affected, the patients are not aware of the ongoing nerve compression until a severe lesion develops. Individual adaptation of the handlebar and riding position seems to be crucial for prevention of this type of nerve lesion.- - - - - - - - - - ranking = 0.33333333333333keywords = muscle (Clic here for more details about this article) |
6/16. Severe ulnar neuropathy after subcutaneous transposition in a collegiate tennis player.We report the case of an "overhead" athlete (a collegiate tennis player) who developed severe ulnar neuropathy after anterior subcutaneous transposition and placement of a fasciodermal sling. Treatment consisted of opening the sling, excising suture material, releasing all other areas of potential compression, and performing anterior submuscular transposition of the ulnar nerve deep to the flexor muscle group. Two years after surgery, subjective symptoms were significantly improved, though the patient continued to experience mild medial-side elbow discomfort and intermittent paresthesia along the ulnar nerve distribution. pain relief achieved without full sensory and motor recovery is consistent with results reported elsewhere. In short, extreme care must be taken when creating a fasciodermal sling during anterior subcutaneous transposition of the ulnar nerve.- - - - - - - - - - ranking = 0.16666666666667keywords = muscle (Clic here for more details about this article) |
7/16. Concomitant compression of median and ulnar nerves in a hemophiliac patient: a case report.A 15-year-old boy, with a diagnosis of hemophilia a, suffered bleeding into his left forearm 5 months before being admitted to our medical center. His neurological examination revealed a pronounced median neuropathy and a minor ulnar neuropathy on the left side. There was marked muscle atrophy on the thenar side and, to a lesser degree, on the hypothenar side and in the forearm. Electromyographic findings demonstrated an evident, nearly complete, sensorimotor axonal loss in the median nerve. magnetic resonance imaging studies showed atrophy in muscles of the left forearm and median nerve. The patient was diagnosed as having median nerve axonotmesis and ulnar nerve neuropraxia due to compartment syndrome. In hemophiliac patients, frequent single nerve compressions (often involving the femoral nerve) can be seen. However, concomitant median and ulnar nerve injuries with differing severity are rare.- - - - - - - - - - ranking = 0.33333333333333keywords = muscle (Clic here for more details about this article) |
8/16. Demyelinating focal motor neuropathy of the ulnar nerve masquerading as compression in Guyon's canal: a case report.ulnar nerve-innervated intrinsic muscle weakness, in the absence of sensory complaints or deficits, usually is the result of compression at the ulnar nerve in zone II of Guyon's canal. In rare instances the problem is not caused by a compressive neuropathy but by a demyelinating focal motor neuropathy. Demyelinating neuropathies have been well documented in the neurologic literature but they have received little attention in the hand surgery literature. We report on one such case and the importance of differentiating the 2 neuropathies. Although surgery often is necessary for a compressive neuropathy it is contraindicated for a demyelinating neuropathy.- - - - - - - - - - ranking = 0.16666666666667keywords = muscle (Clic here for more details about this article) |
9/16. Anomalous flexor digiti minimi brevis in Guyon's canal.In an adult male cadaver, the flexor digiti minimi brevis, a muscle of the hypothenar eminence, was found to arise from the superficial transverse septum (between the superficially placed flexor carpi ulnaris, palmaris longus, and flexor carpi radialis muscles, and the deeply placed flexor digitorum superficialis muscle) in the distal fourth of the flexor aspect of the left forearm. The muscle exhibited two strata of muscle fibers at its origin. The superficial stratum was a thin layer of transversely running fibers confined to the forearm, which has not been previously reported. The deep stratum, a thick layer of longitudinally running fibers, formed the bulk of the muscle. It traversed Guyon's canal superficial to the ulnar nerve and vessels to reach the hypothenar eminence. Its course through Guyon's canal could be a cause for ulnar tunnel syndrome. The ulnar nerve trunk innervated not only the anomalous flexor digiti minimi brevis muscle, but also abductor digiti minimi and palmaris brevis. This may be due to the common phylogeny of these three muscles from the same muscle mass.- - - - - - - - - - ranking = 1.5keywords = muscle (Clic here for more details about this article) |
10/16. An unusual muscle of the wrist with potential compression of the ulnar nerve.During routine cadaveric dissection of the upper extremity an unusual muscle was discovered arising from the tendon of the flexor carpi ulnaris and inserting into the muscle belly of the flexor digiti minimi. The muscle's course was superficial to the ulnar nerve and artery in Guyon's canal. We review the literature regarding such muscle variations and discuss the potential for compression of the ulnar nerve by such muscles.- - - - - - - - - - ranking = 1.5keywords = muscle (Clic here for more details about this article) |
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