Hello there....sorry for answering your question late....well from the symptoms you described your father seems to be in quit a bit of pain...i need to know few answers before i advice regarding the prognosis of your father. 1)Are there any other health conditions your father is suffering from? 2)Are his sugar/calcium/uric acid levels within normal limit or is he taking medication/supplement for it. 3)is he using any back belt like lumbo sacral belt support? 4)since when has his pain started getting severe? 5)does he feel tingling/ radiation pain over his legs? Do let me know regarding these things..... Regards Take care.

Weakness and age both things involves and myosapz forte is a muscle relaxant medicine keep continue and take physiotherapy also for better result and some nutrition required to grow