I had undergo surgery vs I had undergone surgery

Some examples from the web:

• Feb 9, 2016 ... ... damage to my brain and I also broke my neck, I was in a lot of pain that I had undergo surgery, I was out of action for month's moving forward, ...

Some examples from the web:

• Apr 13, 2020 ... Hello sir I had undergone surgery for removal of my wisdom tooth 1.5 year back,from then onwards I had partially lost sense of taste.At that ...
• If I had undergone surgery back in my 20s, before I had my boys I feel like I could have participated more in their fun and have played with them instead of ...
• “I was devastated because I had undergone surgery on that knee years before, but determined to seek another opinion,” Bradley, 49, explains. “I wasn't ready ...
• Jun 18, 2024 ... it is in the centre of the brain but, a week later, I had undergone surgery. I was operated on through the back of my head for eleven hours ...
• Dec 10, 2019 ... It also didn't work out in December of 2008, one month after I had undergone surgery to remove recurrent ovarian cancer that had developed ...
• Feb 25, 2016 ... Then there was the incident five years ago when I had undergone surgery to remove a cancerous tumor. Unfortunately the thing had grown so ...
• Jun 2, 2023 ... I became infected in the operating room where I had undergone surgery. I spent days struggling daily with high fevers, antibiotics, and ...
• Within a relatively short period the scars were no longer visible and no-one would be aware I had undergone surgery, it looked completely natural although the ...
• ... I had undergone surgery to remove a cyst from my vocal chords. I was on vocal rest for a week which means you spend the entire week in silence. The card ...