When considering alternatives to cheek implants, such as a rib graft, it's important to evaluate the benefits and potential challenges. Rib grafts can be a viable option for facial augmentation, especially if previous implants were not well-tolerated. They offer the advantage of using your own tissue, which reduces the risk of rejection. However, the procedure is more invasive and involves harvesting cartilage from the rib, which can lead to additional recovery time and potential complications at the donor site. At 21 years old, with a height of 175 cm, you should discuss with your surgeon the specific reasons for the rejection of the Medpar implant and whether a rib graft would meet your aesthetic goals. Your surgeon will consider factors such as your overall health, skin condition, and the desired outcome to determine the best approach for you.