This anomaly can cause a reduction of fertility if it is unilateral, i.e. of one testicle, or the total loss if it is bilateral, i.e. of two testicles. Since the testicles don't descend and remain in the abdominal cavity or in the inguinal canal, the temperature where they are lodged is higher than necessary so that the correct development of spermatogenesis takes place, that is, the production of sperm cells. This can cause the death of germ cells and, therefore, an ejaculate without sperm cells.
Generally, if surgery is performed at an early age, it would solve the fertility problem, since once testicles have been lodged in the scrotum and remain at the right temperature, their function will be restarted. It has also been shown that early surgery can reduce the risk of testicular tumors, above everything, in those cases of cryptorchidism where the testes are intra-abdominally located.