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Journal of the Korean Academy of Rehabilitation Medicine 2000;24(2):275-280.
Correlation between Cross-sectional Areas of Paraspinal Muscles and Isometric Lumbar Extension Strength.
Kwon, Jeong Yi , Lee, Kang Woo , Kim, Hyeon Sook , Kim, Jong Moon , Ahn, Joong Mo
1Department of Physical Medicine and Rehabilitation, Samsung Medical Center, Sungkyunkwan University School of Medicine.
2Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine.
척추 주위근의 단면적과 등척성 요추부 신전 근력간의 상관 관계
권정이, 이강우, 김현숙, 김종문, 안중모1
성균관대학교 의과대학 재활의학교실, 1영상의학교실

To evaluate the correlation of the cross-sectional areas (CSA) of paraspinal muscles (back extensors and psoas muscles) and full range-of-motion isometric lumbar extension strength in the individuals with low back pain.

Twenty four subjects (14 men and 10 women) with low back pain completed a maximum isometric lumbar extension strength test at seven angles through a 72o range of motion (0, 12, 24, 36, 48, 60, 72 degrees of lumbar flexion). CSA of back extensors and psoas muscles were measured from standardized transaxial view by CT scanner.

CSA of lumbar extensor and psoas were correlated with isometric lumbar extension strength from full flexion to extension in the low back pain patients. The greater the lumbar flexion angle, the greater the coefficient of determination (R2). The correlation coefficients of psoas muscles were greater than those of lumbar extensors.

Both back extensors and psoas muscles do their important role during isometric lumbar extension. Isometric lumbar extension strength of full lumbar flexion is well correlated with CSA of paraspinal muscles.

Key Words: Paraspinal muscle, Muscle cross-sectional area, Isometric lumbar extension strength, Low back pain


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