I had to get quite assertive at one stage in order to get a registrar to schedule an MRI. He only did so, under sufferance, hoping to prove that my problems were osteo-arthritic and not meniscus damage (as I had tried to contend).
Thankfully my specialist, Grant Surtees, was on my side and felt he could see some damage. After seeking another opinion that concurred, I was scheduled for surgery.
An additional complication was that my GP had only ever recorded my knee injuries, two of them, under the same ACC claim as my first one on the left knee. When the registrar scheduled the MRI, he asked me which knee and I said it didn't matter and that the one that was bothering me at the time was my right one. So the right one was MRI'd. When it got back to ACC that we wanted surgery on the right knee they baulked. Eventually Surtees corrected the paperwork and made the operation requirement for the left knee (and told me privately that while I was on the table he'd have a look at the right knee and scrape whatever needed to be scraped in a two for one.)
Anyway after arriving home that day it was immediately apparent that I had no discomfort in either knee and had plenty of movement available. I can see it is going to be a great result!