High tibial osteotomy (HTO) has been widely applied in clinical practice to treat unilateral knee osteoarthritis (OA). In order to improve the effectiveness of surgical treatment, researchers attempted to use a combination of platelet-rich plasma (PRP) and HTO therapy. We summarized the clinical outcomes of engaging HTO and PRP and found promising clinical advantages in improving postoperative pain and function, promoting cartilage repair, and increasing bone cartilage structure in patients. Further studies are needed to provide more convincing evidence of the efficacy of the combined therapy.