LAUSR

It was with great interest that we read the paper by Kandil et al. [1] titled “Allogeneic platelet-derived growth factors local injection in treatment of tennis elbow: a prospective randomized controlled study” published online ahead of print, 2022 Jan 12, of International Orthopaedics. The authors found that local injection of allogeneic plateletderived growth factors is a promising and safe option for treating tennis elbow with significant pain relief, functional improvement, and patient satisfaction. It is a valuable study. We would like to congratulate their laudable efforts in performing this meticulous study. However, there are some issues that we would like to communicate with the authors.