الفهرس 
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Abstract
This study was carried on 57 patients to compare between different injections for tennis elbow patients who failed conservative treatment, it was carried on to distinguish 2nd line of treatment between conservative and operative treatment.The volunteers were divided into three groups: Autologous blood injection, platelet rich plasma injection and triamcinolone injection as a widely known and used steroid for orthopedic injections and commonly used in tennis elbow injection.Assessment was performed using patient rated tennis elbow evaluation questionnaire, a fifteen questions asked to the patient to assess both pain and functional disability, an objective tool for precise assessment of the condition and improvement.Results showed superiority of steroid injection in improvement of patient during the first month post-injection over the two other methods, almost equaling results in the 3 months follow up, and deterioration of the steroid in 6 months follow up with high recurrence rate, superiority of both injection types depending on growth factors: autologous blood and platelet rich plasma was denoted starting from three months follow up post-injection, yet lacking of statistical significance in comparison to steroid injection, and rising till reaching a significant difference in 6 months follow up with slight superiority of PRP over ABI but also lacking significance.Thus autologous blood injection with success rate of 85% in 3 months follow up, 90% at 6 months follow up is offering decent and simple injection choice as: although Platelet-rich plasma has higher levels of growth factors for stimulation of regeneration than autologous blood and they both give almost similar results without statistically significant difference in terms of pain reduction and functional improvement presented by the percentage of the total PRTEE score DROP throughout the follow up period up to 6 months, and the complicated, time consuming, and highly demanding preparation and application processes of platelet-rich plasma requiring specialized equipment and specially trained personnel, guiding us to support the use of autologous blood injection as the 2nd line of treatment in previously failed conservative treated tennis elbows in agreement with more than one study carried out on recently.