A STUDY ON LUMBAR FACETS, WITH EMPHASIS ON MORPHOLOGICAL AND ROENTGENOLOGICAL CHANGES

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  • OHMURA Kazuhisa
    Department of Orthopedic Surgery, School of Medicine, Showa University

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  • 腰椎椎間関節の形態学的, 並びにX線学的研究
  • ヨウツイ ツイカン カンセツ ノ ケイタイガクテキ ナラビニ Xセンガクテキ

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Sixty lumbar facets were studied morphologically and in serial sections. The lumbar facets were prepared by cutting sagittally and horizontally at a thickness of 600 microns, and these facets were also observed macroscopically and roentogenologically. As a result of these examinations, the lumbar facets were found to be more coronal and horizontal with descent ; whereas, the area of the cartilage surface was apt to increase at the lower regions. In the upper facets, changes in the cartilage surface were found to be more of a consumptive nature and in the lower, more of a hypertrophic. In addition, the cartilage layer was thick in the middle of the coronal portion, but in the superior and the inferior it was thin ; also, the cartilage layer of the lower facets was found to be generally thin. Sclerosis of the subchondral bone was thick in the coronal portion.“Randwulste”was identified on the peripheral portion, and its width increased with descent. With regard to the synovial tabs found in the superior and the inferior recesses, they intervene among the joint spaces in 33 out 60 joints. In the inferior recess, impingement of the synovial tabs was found in 11 out of 60 joints preceding into the superior recess. In the degenerated facets, intervention of the synovial tabs into the joint spaces was considered to play a functional role. But, on the other hand, impingement of the synovial tabs into the inferior recess indirectly stimulates capsula articularis, thus causing low-back pain.

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