A significant posture-dependent difference of the dural sac cross-sectional area at the level of intervertebral disc in asymptomatic volunteers has been demonstrated. When the posture changed from supine to standing position, lumbar dural sac volume expanded by the increased pressure of cerebrospinal fluid, and the dural sac cross-sectional area increased. The smallest values were found in the supine position.
We found posture-dependent differences of the length of the cervical cord in the recumbent and erect series. These results may be important when assessing the dynamic factor in cervical spondylotic myelopathy.
We found posture-dependent differences of ACSCC in the recumbent and erect series. These results may be valuable for identifying a dynamic factor in patients with cervical spondylotic myelopathy.
Although the subject of entrapment and compressive neuropathies is huge, with dedicated textbooks on the subject, this article attempts to provide an up-to-date overview of the role of imaging in the diagnosis of nerve entrapment and compression syndromes. Entrapment and compressive neuropathies are a group of distinct syndromes secondary to physical constriction or irritation affecting peripheral nerves at specific anatomical sites in the body. Most nerve entrapment and compressive syndromes derive from an injury to the neurovascular components in a narrow anatomical passage. Because of their etiological diversity, which includes pressure, angulation, stretch, and friction, the pathophysiology of individual nerve entrapment syndromes differs widely. Neuropathy can result in considerable morbidity. Although the mainstay of achieving diagnosis is with clinical acumen and electrophysiological investigations, the increasing use of modern high-resolution imaging studies is of particular value in confirming physical findings and enabling determination of the extent of injury. Knowledge and familiarity of pertinent anatomy and appropriate choice of imaging modality is important for the radiologist to allow accurate interpretation of site and etiology of nerve entrapment and compression as well as ascertaining possible alternative diagnoses.
Injuries to the peroneal tendons are relatively common worldwide but tendon rupture without significant trauma is uncommon. Ankle mechanics can be seriously affected by disruption of one or both of the peroneal tendons although complete rupture can also remain asymptomatic. Accessory ossicles are sesamoid bones and are common findings in routine radiology of the foot and ankle. Although in the vast majority these "os" are normal variants of anatomy, they can lead to painful syndromes and suffer fractures and even undergo degenerative changes in response to overuse and trauma. Although similar syndromes have been discussed in the surgical literature, there is a lack of literature describing the use of modern imaging in the accurate diagnosis and its subsequent assistance towards appropriate management of os peroneum friction syndrome complicated by sesamoid fatigue syndrome. This article presents the plain film, sonographic and magnetic resonance imaging findings in a case of os peroneum friction syndrome complicated by a sesamoid fatigue fracture as well as reviewing the pertinent literature.
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