60 patients with full-thickness suprispinatus tear and scheduled for arthroscopic double-row repair were randomized to one of two groups to determine the effect of postoperative platelet-rich plasma (PRP) injections on tendon healing. In one group, patients received an injection of PRP at 7 and 14 days postoperatively, whereas the second group did not receive any PRP injection. Follow-up was performed for 16 weeks postoperatively. Results demonstrated no significant differences between groups in Sugaya Classification of tendon structure, clinical outcome measures, range of motion, or isokinetic strength.