This procedure is usually performed between six months and two years of age and is called an orchidopexy procedure. This can be described as fastening the undescended testicle in its normal position.
Under a general anaesthetic, an incision is made in the scrotum or groin area. The blood supply and nerves to the testicle are identified and carefully preserved.
The surgeon may need to reach into the groin with special instruments to gently bring the testicle down. Under certain circumstances a laparoscope (telescope) may be used.
The testicle, its blood supply and nerves are sewn in place and the skin closed with self-absorbing sutures. Your little man will probably be in hospital for between three and six days.
The success of treatment depends on the position of the testicle(s) at diagnosis.
Without meaning to scare you, this will increase his risk of testicular cancer at a later date, something that was not know when I had this op in the '60's.
http://www.cancerhelp.org.uk/help/default.asp? page=2542
Anybody in the 'know' at the hospital should be able to give you more information on this ...
Just make sure that (from 14 years say) he regularly checks for lumps, and if one is found ... straight to the GP...I did 2� years ago ... had the op, 1 removed ... scary as hell ... over it ... no reason why I won't live to be 90.