Callus formation in the humerus compared with the femur and tibia during limb lengthening |
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Authors: | K Tanaka K Nakamura T Matsushita S Horinaka I Kusaba T Kurokawa |
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Institution: | (1) Department of Orthopaedic Surgery, Faculty of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan, JP |
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Abstract: | We investigated whether the callus formation in the humerus during the distraction period of limb lengthening proceeds at
a higher rate than that in the femur and tibia. Ten achondroplastic patients underwent 3 bilateral humerus, 3 bilateral femur
and 4 bilateral tibia lengthenings. To reduce the confounding effect of bone size, we used bone mineral apparent density (BMAD)
to compare the three groups; this is a volumetric bone mineral density measurement. BMAD in the distracted callus space was
evaluated at 8 weeks after the start of distraction using dual-energy X-ray absorptiometry (mean ± SD; g/cm3): in the humerus (0.24 ± 0.08) it was significantly higher than in the tibia (0.10 ± 0.02), while there was no difference
between the humerus and femur (0.35 ± 0.11). We conclude that the callus formation in the humerus during the distraction
period of limb lengthening proceeded at a significantly faster rate than in the tibia, but there was no significant difference
between the humerus and femur.
Received: 4 March 1997 |
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