Can Arimidex be the cause of sore knees

[LondonBodybuilder2014]

To cut a long story short I was using Arimidex as an AI on a test e and anavar cycle. Ever since I come off cycle a few months ago I've had sore knees about the patella and unable to squat at all without soreness. Could too low oestrogen and continuing to lift heavy be what has caused the damage or is it more likely to be from just lifting heavier than my tendons could withstand?
Any thoughts on this would be helpful

 

[H_T_]

Time to deload, it seems. Won't be long, just a few weeks of slow progression. Aim for pain free squat workouts.