I am planning to start my immigration process to Canada very soon, and as you know, it's a big step that requires a lot of planning.
I am a healthy 29 year-old male with no health problems except for a surgical procedure I had 6 years ago to treat a Ureteropelvic Junction Obstruction. The surgery went fine and no further treatment / medication is required.
I would like to ask for your advice on whether or not the aforementioned issue might make me "Medically Inadmissible" to Canada.
There are three grounds on which someone can be refused for medical reason: threat to public health, threat to public safety and excessive demand on social/health services.
Active TB and syphilis fall under the first two categories, as would other communicable diseases. HIV, diabetes, downs syndrome, CP and other chronic conditions fall under the excessive demand category.
Excessive demand is strictly financial. A child that requires special education services won't pass this threshold generally because special education is expensive. Chronic conditions may be able to meet the restriction if they do not have a high associated cost. But each case is unique.
Note that if any family member is inadmissible the entire family is inadmissible.
From above,this can be assumed that you won't be inadmissible on medical grounds.