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강재도,김광열,김형천,정경칠,유호섭 대한척추외과학회 1997 대한척추외과학회지 Vol.4 No.2
Study Design : The lumbar segmental motions were analysed in asymptomatic volunteers. Objectives : To obtain normative data on flexibility and Graf's instability degree in sagittal plan of the normal lumbar spine. Summary of Literature Review : Although several clinical and radiological measurement techniques are available, little i s known about the normal range of lumbar spine motion. As a consequence, the diagnostic evaluation of radiographs are frequently based on subject opinions rather than object reality. Materials and Methods : The authors have checked lumbar flexion-extension views of 95 asymptomatic volunteers who were divided into 5 groups by the age, and then. their flexibility and Graf's instability degree were calculated by Graf's method with using Graf/Bar Mark Ⅱ(digitalizing table) and personal computer program (Rachis??. Evaluation of the sexual difference and comparison of the difference of each age group in spine level were done. Results: 1. There were significant differences in flexibility among age groups(p<0.05) and highest flexibility was observed in group l (age: 15-19yrs) and L5-S1 segment. 2. Flexibility was not different between male and female(p>0.05). 3. Graf's instability degree was not different among 5 age groups(p>0.05), and between male and female(p>0.05). 4. The mean Graf's instability degree was below 8° in L2-3, L3-4, and L4-5 segment, but above 8 in L5-51 segment(male: 11.62±9.27°, female: l 1.11±8.70°) . Conclusions : Although we observed small subjects, these results are the basic steps toward more objective and careful interpretation of flexibilty and Graf's instability degree.