"Things go wrong but what matters is that you don't cover it up and you do tell the patient," Dr Roberts said.
The incident was reported in the minutes of the August 25 meeting, which were publicly released at the following meeting on October 6.
A patient was to receive a steroid injection to the side of their spine earlier this year when the orthopaedic surgeon accidently injected the wrong side. They had to repeat the uncomfortable procedure, to address a pinched nerve root for back pain, on the correct side.
The surgeon immediately told the patient, who was very understanding of the mistake and who had experienced some milder symptoms on that side anyway.
The procedure was performed with less staff than usual as the theatre was being prepared for an emergency case, Dr Roberts said.
The checklist was incorrectly completed and there was no arrow marked for which side was to be injected. While Dr Roberts did not make excuses for the mistake, he said: "If someone was going to have a more serious procedure then it would always be checked".