Abstract—Kyphosis and lordosis changes might be related to back extensor weakness and osteoporosis. The purpose of this study was to find out the correlations between thoracic kyphosis, lumbar lordosis with back extensor strength (BES) and bone mineral density (BMD).
Methods: Thoracic kyphosis, lumbar lordosis, maximal isometric strength of the back extensors and BMD of the lumbar vertebral were evaluated in 47 elderly (50-75 years old)women. BMD of the lumbar vertebral was measured using Dual-Energy X-Ray Absorptiometry (DEXA) and kyphosis and lordosis degree were assayed using a flexible ruler. The maximal isometric strength of the back extensors was measured using an isometric manual muscle tester (MMT). Data were analyzed using ANOVA and independent t-test at p≤0.05 level of acceptance.
Results: A significant reverse correlation was shown between BES and kyphosis (p=0.044, r=-0.30). No significant correlation were found between BES and lordosis degree, nor between lumbar vertebral BMD and, both, kyphosis and lordosis degrees. However, there was a significant difference in BES between three groups with various degree of kyphosis (p≤ 0.05).
Conclusion: It can be concluded that the severity of thoracic kyphosis may be influenced by BES. So, stronger back extensor can prevent thoracic kyphosis despite decreased BMD.
Key Words: Bone Density, Muscle Strength, Kyphosis, Lordosis.
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