According to previous studies, the effect of PRP to patellar tendinopathy could last longer. However, the type, concentration, time and frequent of injection are still debated。 This study is to understand the effect of multiple injection of platlet-rich plasma in chronic patellar tendinopathy and to analyze the relation between efficacy of PRP and the growth factor in PRP.
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Change from baseline Victorian Institute of Sport Assessment (VISA-P) score to 36 weeks
Timeframe: 36 weeks
Change from baseline modified Blazina Scale to 36 weeks
Timeframe: 36 weeks
Change from baseline thickness of patellar tendon to 36 weeks
Timeframe: 36 weeks
Change from baseline Visual analogue score(VAS) to 36 weeks
Timeframe: 36 weeks