Dr Teo will face the Health Care Complaints Commission in Sydney on Wednesday before learning whether he will be reprimanded and hit with additional conditions as a surgeon.
The 65-year-old has previously admitted he did something during surgery that caused the injuries to the women, but firmly rejected suggestions he was negligent.
"I also want to try to understand why the patient had a bad outcome," Dr Teo told the inquiry on Tuesday.
"Clearly I've gone too far somewhere.
"I think that I've probably gone across the midline, one to one and a half millimetres … but that's enough to damage a patient when you're doing surgery in this area."
The Commission's counsel Kate Richardson accused Dr Teo of deliberately lying in his evidence about how much he told one of the patients and her husband about the risks involved with surgery.
Ms Richardson told the hearing Dr Teo had initially admitted to disclosing just a five per cent risk of death or other serious complications, which he later tried to suggest included telling them there was a 100 per cent chance of paralysis.
Expert neurosurgeon witnesses, including one called in Dr Teo's defence, told the inquiry the risk of paralysis, death or locked in syndrome was likely about 60 per cent.
"He was being untruthful with this committee and he was deliberately being untruthful in order to sidestep the evidence of his own witness," Ms Richardson said.
The husband claims Dr Teo gave the couple no indication the procedure could go badly and convinced them to consent to the operation with less than 24 hours notice.
Ms Richardson said Dr Teo lacked the empathy and insight to understand why the man had lodged a complaint against him, having told media he was likely "hoodwinked" into doing so.
The hearing is expected to wrap up on Wednesday before a decision is made by a four-person Professional Standards Committee.
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