Patella Aplasia-Hypoplasia, also known as patella aplasia or hypoplasia, is related to aniridia and absent patella and nail-patella syndrome. An important gene associated with Patella Aplasia-Hypoplasia is PTLAH (Patella Aplasia-Hypoplasia). Affiliated tissues include bone and skin, and related phenotypes are abnormality of the skin and patellar aplasia