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KMID : 1189320130070040308
Asian Spine Journal
2013 Volume.7 No. 4 p.308 ~ p.313
The Influence of Fat Infiltration of Back Extensor Muscles on Osteoporotic Vertebral Fractures
So Kwang-Young

Kim Dae-Hee
Choi Dong-Hyuk
Kim Choong-Young
Kim Jeong-Seok
Choi Yong-Soo
Abstract
Study Design: Retrospective study.

Purpose: To investigate the influence of fat infiltration at low back extensor muscles on osteoporotic vertebral fracture.

Overview of Literature: In persons with stronger back muscles, the risk of osteoporotic vertebral fractures will likely be lower than in those persons with weaker back muscles. However, the degree of influence of fat infiltration of the back extensor muscle on osteoporotic vertebral fracture remains controversial.

Methods: Two hundred and thirty-seven patients who had undergone lumbar spine magnetic resonance imaging and bone mineral density (BMD) were enrolled in this study. The amount of low back extensor muscle was determined using the pseudocoloring technique on an axial view of the L3 level. The patients were divided into two groups: osteoporotic vertebral fracture group (group A) and non-fracture group (group B). The amount of low back extensor muscle is compared with BMD, degenerative change of disc, osteophyte grade of facet joint and promontory angle to reveal the association between these factors.

Results: A negative correlation is found between age and the amount of low back extensor muscle (p=0.001). The amount of low back extensor muscle in group A and group B was 60.3%¡¾14.5% and 64.2%¡¾9.3% respectively, thus showing a significantly smaller amount of low back extensor muscle in the osteoporotic vertebral fracture group (p=0.015).

Conclusions: Fat infiltration of low back extensor muscle was increased in osteoporotic vertebral fracture patients. Therefore, fat infiltration of low back extensor muscle in an elderly person may be a risk factor of osteoporotic vertebral fracture.
KEYWORD
Osteoporotic vertebral fracture, Fat infiltration, Back extensor muscle, Bone mineral density
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