Chen et al. demonstrated that at least two monthly PRP injections may have some benefits in patients with mild to moderate knee OA combined with ultrasound‐confirmed suprapatellar bursitis as there were significant decreases in synovial fluid volume and proteins associated with inflammation, such as apolipoprotein A‐I, haptoglobin, transferrin, and matrix metalloproteinase.9 This evidence concerns the gene TF and frozen shoulder.