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The most common vertebral bodies with compression fracture were from T12 to L2 in both groups ( Fig. Group A had a mean age of 69.7☑2.9 years, a mean BMD of -3.5☑.3, 15 male and 39 female patients, and a mean length of hospital day of 14.2☗.3 day, On the other hand Group B had a mean age of 66.1☑4.4 years, a mean BMD of -3.5☑.3, 18 male and 48 female patients, and a mean length of hospital day of 25.9☙.5 days ( Table 1). A P-value of less than 0.05 was considered statistically significant. Chi-square test, Fisher's exact test, Independent Samples T-test were used. Statistical analysis was performed using SPSS statistic software ver. The ABR-caused complications included constipation, nausea and voiding difficulty, and they arose only after the compression fracture occurred. The rates of development of complications in the ABR period groups were also compared. The deteriorations in the compression fractures of each group during each ABR period were compared according to gender, age, and BMD. The compression fracture was deemed to have deteriorated if the compression rate increased by at least 10%. The courses of the groups were monitored at the baseline, and after one, two, four and eight weeks through X-ray images to assess the development of complications during the ABR period. The compression rate was calculated as follows: 100-×100, wherein "a" and "c" represent the normal vertebral bodies that were one level higher and lower than the compression-fractured vertebral body, respectively, and "b" represents the height of the compression-fractured vertebral body 24). In each group, the subjects' ages, gender, lengths of hospital day, bone mineral density (BMD) and fracture level, visual analog scale (VAS) scores and compression rate in each ABR period were investigated. The groups were compared according to their ABR periods, which were one week for Group A and two weeks for Group B. Considering that bed rest may cause inconvenience and various complications, differences in the prognosis according to the ABR period were investigated in this study. The complications of ABR have been reported to include muscle weakness, systemic inflammation, atelectasis, metabolic change, microvascular dysfunction, thromboembolic disease, joint contracture, and skin ulcer 3, 5, 21, 23). Though absolute bed rest (ABR) has been recommended and implemented, no guidelines on its optimal period has been suggested 8, 13, 17, 18). For the conservative treatment of compression fracture, short bed rests and the use of orthoses have been suggested 6, 9, 17, 18, 23). They often lead to back pain and spine deformities such as kyphosis, kyphoscoliosis and loss of vertebral height, which cause deteriorations in the management of daily life activities and in quality of life 1, 4, 7, 11, 12, 18). Compression fractures are usually caused by osteoporosis, severe trauma, infection, and neoplasm 1, 10, 16, 19).
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