The study of evaluated features for X-ray image after total hip replacement

• Main Authors: Shing-Yuan Lin, 林幸元
• Other Authors: Yung-Hui Huang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/pfs265

碩士 === 義守大學 === 資訊工程學系 === 105 === Total hip replacement has been the primary choice of treatment for patients with degenerative or traumatic conditions such as advanced osteoarthritis, rheumatoid arthritis of the hip joints, avascular necrosis and fracture of the femur. The metallic implantation from hip replacement due to insufficient tightness could result in tissue deformation, wear, loosening, infection and bone dissolution between the acetabulum and the bone cement glue that cause pain, unstable gait, lack of joint support and other discomfort to the patients. This is a retrospective study with matching experiments. Total of 38 cases of patient with artificial hip arthroplasty were enrolled from 2004 to 2016, including 21 males and 17 females. The mean age of the first THR postoperative follow-up was 52.5 ± 13.2 years; the mean age of the second THR was 55.3 ± 13.2 years. The first THR post-operative images were designated as the control group. The second THR preoperative image was selected as the experimental group. Four characteristic ratios were extracted by utilizing 5 imaging profiles, including maximum to minimum ratios (Max_Min), the median to minimum ratio (Med_Min), mean to minimum ratio (Mean_Min), mean to standard deviation ratio (Mean_SD)of the image intensities of the line profile graphs. The statistical analysis included the descriptive statistics, the nonparametric Wilcoxon rank test, the Pearson correlation coefficient and the regression analysis. The average days between the images taken for control group and the experimental group was 870.4 ± 647.9 days for men and 1318.2 ± 979.7 days for women. By means of nonparametric Wilcoxon rank test, the difference of the four characteristic radios of each location is found. It is found that there is one significant image feature ratio in the four line. Including (L1) is the ratio of the maximum to minimum (Max_Min), (L2) is the ratio of the median and to minimum (Med_Min), (L3) the ratio of mean to minimum (Mean_Min), and the (L4) is the ratio of average to the standard deviation (Mean_SD) of the image intensity(P <0.05). There was a low positive correlation between the number of days and the control group (P <0.05). There was no significant correlation between the characteristic ratios of L3 and L4 location in the control group. The results of regression analysis showed that the age and control group had significant difference and could be used to estimate the number of days. This study was to understand the significance ratio of each location. The number of days of hip joint after became loose was estimated by the characteristic ratios of images and age from the control group. The challenge of this study is the inadequate numbers of enrolled cases. It is recommended to increase the number of samples to improve the reliability and accuracy in the future.