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Lumbar facet joint fat pads: their normal anatomy and their appearance when enlarged (1991)

Taylor, J. R. ; McCormick, C. C.

Springer

Neuroradiology 33 (1991), S. 38-42

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ISSN: 1432-1920

Keywords: Facet joints ; Lumbar spine ; Joint inclusions ; Fat pads

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary The polar recesses, superior and inferior to lumbar facet joints, are filled by fat pads from which fatfilled synovial folds project between the articular surfaces for a distance of two to four millimetres. The intracapsular superior recess lies between the ligamentum flavum and the lamina above. The extracapsular inferior recess lies on the back of the lamina below and communicates with the joint through a hole in the inferior capsule. The intracapsular folds move freely in and out of the joint during movements. These features are demonstrated in anatomic studies using transverse sections and radiologic studies using computed tomography. In about 4% of lumbar spines examined, the intraarticular fat pads are enlarged and extend from the joint recess(es) into the middle third of one or more facet joints. The fat pads can be identified in CT scans by their radiolucency and distinguished from vacuum phenomenon by measuring their attenuation values. The cause of the intra-articular enlargement of the fat pads is unknown, but it is suggested that their extension into the middle third of the joint may be secondary to degenerative change in the motion segment with capsular laxity in the affected joint.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00593331

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