In the 21 century, retailing is an important part of the economy. E-tailers are an emerging innovative aspect of retailing. With e-tailers, geographic boundaries are eliminated and a wider range of services can be provided to consumers. Parallel to these developments, the number of competitors in the e-tailers sector is increasing and the sector is in a more rigorous competitive environment. The secret to being successful in this market, where stronger can survive, is difference from traditional business at some point. The success factors of e-tailers need to be handled separately for reasons such as cost structures being different and being totally technology-oriented. In this study, success factors that affect the performance of e-retailers are examined. Etail performance in research; organizational learning is explained by inimatibility and core competencies. In addition, internet marketing involvement and competition intensity are considered as control variables. In the research model, it is assumed that there is a relationship between resources and market power, market power and performance. The data of the research was collected through online questionnaire from the university students and staff selected by easy sampling. The research model was tested with structural equation modeling. As a result of the research, it has been determined that organizational learning and basic competencies affect the market power. The original contribution obtained with this study is to show that the determinants of performance for e-tailers are the resources they have. The limitations of the research are that it cannot be generalized to large masses due to the sample. In addition, the premium pricing of e-tailers selected for performance measurement made it difficult to obtain an objective finding, because it was perceived as a subjective expression that varies according to personal preferences. In future studies, it is recommended that the use of price satisfaction related to the performance of e-tailers.

Objective: Osteoarthritis, which is one of the most common causes of pain and motion loss, is an important medical disease that particularly affects elderly people. Unicondylar knee arthroplasty treatment is still a challenge for obese and/or ACL deficient patients. In addition, surgeons have difficulty in decision making whether to use fixed or mobile bearing designed unicompartmental knee prosthesis. The objective of this study was to evaluate the effect of fixed or mobile insert design prosthesis on the mid-term results of patients that were followed up for 8 years or more.Methods: Between 2003 and 2014, 293 patients were treated with unicondylar knee arthroplasty due to medial gonarthrosis, and 239 patients that we followed up for at least 18 months were included in the study. Nine of the patients (3.7%) underwent bilateral operation, 193 (77.8%) patients were operated with the fixed insert design, and 55 (22.2%) patients were operated with the mobile insert design. A total of 248 knees were evaluated retrospectively. 64±5.32 (68-78), and the mean Knee Society Knee Scoring System (KSS) score was 70.6±3.9 (66-89). The postoperative mean WOMAC value was 97.23±4.02 (92-100) (p<0.05), and the mean KSS score was 92.3±3.94 (85-100) (p<0.05). Results Conclusion:When we compared the fixed and mobile insert design prosthesis, there was no statistically significant difference between the knee scores, but the mobile insert design prosthesis had better flexion degrees. We have observed 97.2% prosthesis survival rates over 8 years. In conclusion, unicondylar knee prosthesis is a good treatment option, with a high success rate for medial knee osteoarthritis. (JAREM 2016; 6: 31-4)