What are the risks involved with undescended testicle surgery?

See below: The risks are minimal: bleeding, infection, damage to the vas, and atrophy of the testis. Re-ascent is rare. If done laparoscopically, damage to the intra-abdominal structures can occur but is exceedingly rare.

Small risks: Infection, bleeding and loss of blood flow to the testicle after placing it in the scrotum. The overall risk is 5%.

Fortunately low: Usual surgical risks of bleeding, postoperative hematoma & infection with obese boys at greater risk. Sometimes difficult to place undescended testis low or at base of scrotum. Occasionally testis may atrophy due to impaired blood supply. There is potential risk of "secondary ascent" especially if mothers carry child on their hip after surgery or older boys pressing video game control between legs. Fortunately rate of complications is low.