A new patented product named lyophilized Growth Factors has been developed. It is a novel advanced and refined form of conventional platelet-rich plasma. Effectiveness of intra-articular lyophilized Growth Factors injection has been studied in thirty patients with symptomatic primary knee osteoarthritis and has shown encouraging results regarding improvement of pain, stiffness and function in addition to decreasing knee effusion.~The lack of good quality evidence to support the efficacy of injecting platelet-derived lyophilized growth factors in treatment of subacromial impingement highlights the need for thorough evaluation of the outcome of this novel therapeutic option in patients with subacromial impingement.
The aim of this study is to evaluate the efficacy of ultrasound-guided injection of platelet-derived lyophilized growth factors in treatment of subacromial impingement.