Hello,

Do you still do physiotherapy exercises, including stretching? It appears that your ankle range of motion has been restricted for a very long time. In any case this would lead to considerable shortening/lengthening of the muscle groups around the ankle.

From what you describe you have a bony block to movement upon plantar flexion?

If this is the case you may need to lengthen specific muscles to give you the range of motion necessary for full flexion.