Hi welcome to Healthcaremagic
Hi..., the excruciating pain in the knee, is may be due to the irritation of the nerve
, The nerve is branches of the obturator nerve and femoral nerves..,.
also if the thigh muscle is unused then it will undergo wasting and fibrosis
, hence when you reuse the muscle there will pain pain due to stretching... analgesic
will help you..
Hope I have answered your question..