Hi.
Thanks for your query and an elucidate history.
Noted the history of one testicle removed for the cancer.
It is the only remaining testicle that is causing the problem.
As has been told to you, the problem looks that you have not yet completed the family.
First of all get your
semen analysis done
Get
ultrasonography and color doppler done.
IF you are married get your family completed fast.
You can also preserve your semen for as long time as you wish in a semen bank.
Now you can consult a Laparoscopic Surgeon with Urological background .
A simple procedure of releasing the
spermatic cord from inside of the abdominal wall to lengthen it and dissection in the canal will allow the testicle to reach inside the
scrotum fully without much complications.
Nor Orchidopexty can be done so that the testicle is not allowed to travel up.
and your problem will be solved permanently.