X ray of the week # 8 (UPDATED)

45year old male Patient presented with history of surgery of  to left hip following fall and fracture 25 years back. There is history of only one surgery on his left hip(No history of Implant removal). Patient also gives history of plaster cast immobilization extending from Umbilicus extending into both lower limbs for couple of months. Following which he had painless hip and was able to perform all his daily routine without any pain. Now presented with pain in the hip since 1 year.

What fracture he had 25 yeasr back?
What surgery did he undergo?
What is the present diagnosis