Hi Baboy,
I too am an AK (above knee) amputee and came to Thailand many years ago with TWO prostheses, one being a ‘spare’.
The prostheses are made with a number of components and mine includes a ‘knee joint’ made by a German company, Otto Bock, which is very clever, mechanically, and has a normal ‘swinging action’ which, cosmetically, looks like a normal walking gait.
I have used this company in Bangkok and Khon Kaen, who have serviced the prostheses over the years, replacing the foot and servicing the knee. It is NOT cheap, but they also offer high-tech upgrades which include ‘bionic’ knees and are a very professional outfit.
PM me for further contact details if interested. I do NOT represent the company.
My suggestion would be to see if Otto Bock are represented in Australia and rely on their Thai facilities for local, prosthetics engineers.