Muscular Activities in Ankylosing Spondylitic Patients-A surface EMG Study

Muscle involvement in ankylosing spondylitis (AS) has seldom been investigated. The ankylosing spondylitic patients have marked muscular atrophy and functional incapabilities. The objective of this study is to biomechanically explore the muscular involvement of the ankylosing spondylitic patients. Eight normal subjects and eight-een patients with AS were studied. The AS patients consisted of seven kyphotic and eleven non-kyphotic patients. Two of the kyphotic AS patients were also corrected by multiple spinal osteotomy and Cotrel-Dubousset instrumentation, and their post-operative evaluation, were done as well as the preoperative ones. Surface electromy-ography (EMG) was applied to evaluate the muscle activities. Six paired surface elec-trodes were put on the right and left paraspinal and Hamstring muscles on each sub-jects. Every subject was asked to perform four different static postures: standing, sitting, maximum trunk flexion and prone lying except those who had undergone op-eration. The post-operative patients were only studied in three postures: standing, sitting and prone lying. The results showed that the non-kyphotic group of AS patients had similar muscle activities pattern with normal subjects during four different pos-tures. The EMG activities of the kyphotic AS patients were significantly different with the normal subjects. The results of the post-operative group of the kyphotic AS pa-tients showed that the muscle activities were greatly reduced as comparing with the preoperative results.

並列關鍵字

Ankylosing Spondylitis ； Muscular Involvement ； Electromyography

國際替代計量

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