Hi, thanks for writing to HCM.
Let me tell you certain bare facts about polio
* there is no way that you can strengthen the polio affected muscles of your left leg at this point of time. Because the polio affected muscles will not have the inherent "tone" which normal muscles have and will not have proper nerve
supply making them very weak and atrophied.
You can definitely walk without support by using CALIPERS (Visit an artificial limb center or an orthotic manufacturer for this purpose).
You have not mentioned whether the shortening is 5 "cms" or 5 "inches". This shortening can be corrected by technique of bone lengthening called "ILIZAROV BONE TRANSPORT OR OSTEOSYNTHESIS" . So consult an orthosurgeon with good experience and reputation in Ilizarov fixation (I hope there will a handful of surgeons in bangalore) and follow his advice.
Hope this information is helpful to you. Regards