EVALUATION OF THE SHORT-TERM OUTCOMES OF PLATELET-RICH PLASMA INTRA- ARTICULAR INJECTIONS FOR TREATING PATIENTS WITH EARLY STAGE GONARTHROSIS ERKEN EVRE GONARTROZ HASTALARINDA EKLEM İÇİ TROMBOSİTTEN ZENGİN PLAZMA TEDAVİSİNİN ERKEN DÖNEM SONUÇLARININ DEĞERLENDİRİLMESİ