OBSERVATION OF THE BODY COMPOSITION OF THE HAND BY COMPUTED TOMOGRAPHY

• Published in: Journal of The Showa Medical Association Vol. 47; no. 2; pp. 177 - 188
• Main Author: OKUDA, Ryozo
• Format: Journal Article
• Language: Japanese
• Published: The Showa University Society 1987
• ISSN: 0037-4342; 2185-0976
• DOI: 10.14930/jsma1939.47.177

Using X-ray CT (Computed Tomography) image, the composition of the hand in the central and distal (1/3) part was studied in 54 humans (27 males, 27 females) . The total cross-sectional area and the area of the subcutaneous fatty layer, the bone and the muscle (thenar muscle, hypothenar muscle, interossei muscle, and flexor tendon and lumbricalis muscles) were measured. And the difference due to sex, side, age, handness and grip strength were discussed. The following results were obtained. 1. On the body composition of the hand in the central section, the ratio of the muscle area was 50.2 % (right), and 46.6 % (left) in males and 45.2 % (right), and 43.1 % (left) in females. On the ratio of the subcutaneous fatty layer and the bone, no difference in the right and left hand were noted and former was 28 % (males) and 33 % (females) and the latter was 23.5 % (males) and 22 % (females), respectively. 2. On the muscle composition in both section, thenar muscle group occupied the largest area, and was larger in male than in females, and on right hand than on left hand. Hypothenar muscle group and interossei muscle group occupied the second area (the area in both muscle group was almost equal), and flexor tendon and lumbricalis group showed the smallest area. In the distal section, the area of thenar muscle group and hypothenar muscle group were smaller and total interossei muscle group was larger than in the distal section. The area of flexor tendon and lumbricalis group in the distal section was equal to the area in the central section. 3. No difference by the age was noted the both section. 4. Thenar muscle group and total interossei muscle group showed the correlation with the grip strength, but the ratio of the subcutaneous fatty layer decreased with increase of the grip strength. 5. The total cross-sectional area on right hand of the right hander was higher than on left hand, and the muscular area was correlated with the total area and thenar muscle area showed the correlation only.