I had undergone surgery vs I had undergo surgery

Some examples from the web:

• The animals had undergone surgery to conceal explosives and detonators inside them.
• She'd undergone surgery for colon cancer.
• Before she had undergone the surgery, we should have...
• "Have you recently undergone surgery?"
• Subject: Minimally invasive aorta repair in a patient who had undergone transplant surgery
• Applicants who have undergone eye surgery may be assessed as fit subject to satisfactory ophthalmic evaluation.
• The car has just undergone major surgery, I have just closed the patient's chest, and I'm forcing him to play rugby.
• It is not known if Tadalafil Lilly is effective in patients who have undergone pelvic surgery or radical non- nerve-sparing prostatectomy.
• Applicants who have undergone eye surgery shall be assessed as unfit until full recovery of the visual function.
• It is not known if CIALIS is effective in patients who have undergone pelvic surgery or radical non-nerve- sparing prostatectomy.
• He has, however, undergone a major surgery.
• As for other anticoagulants, fondaparinux should be used with caution in patients who have undergone recent surgery (< 3 days) and only once surgical haemostasis has been established.
• 10 YENTREVE and Prior Continence Surgery: there are limited data that suggest that the benefits of YENTREVE are not diminished in women with stress urinary incontinence who have previously undergone continence surgery.
• YENTREVE and Prior Continence Surgery: there are limited data that suggest that the benefits of YENTREVE are not diminished in women with stress urinary incontinence who have previously undergone continence surgery.
• ARICLAIM and Prior Continence Surgery: there are limited data that suggest that the benefits of ARICLAIM are not diminished in women with stress urinary incontinence who have previously undergone continence surgery.
• As for other anticoagulants, fondaparinux should be used with caution in patients who have undergone recent surgery (< 3 days) and only once surgical haemostasis has been established. ro
• As for other anticoagulants, fondaparinux should be used with caution in patients who have undergone recent surgery (< 3 days) and only once surgical haemostasis has been established. lP
• DULOXETINE BOEHRINGER INGELHEIM and Prior Continence Surgery: there are limited data that suggest that the benefits of DULOXETINE BOEHRINGER INGELHEIM are not diminished in women with stress urinary incontinence who have previously undergone continence surgery.
• The effectiveness of Dynastat in treating pain after an operation has been studied in 2,582 adults who had undergone a variety of surgical procedures including dental, orthopaedic (bone), gynaecological or coronary (heart) bypass surgery.
• Cyprus had undergone much suffering, but had built an enviable level of democracy and prosperity.

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, ...