Hello there.... Forzen shoulder is a common condition after 60 years ....it is more common in diabetic patients.... there are 3 basic principals to follow in case of Frozen shoulder.....
1) keeping sugar levels in check
3)improve range of motion
1st condition can be taken care by a physician...for the other 3 points a physical therapist is a must.
Remember Adhesive capsulitis/Frozen shoulder is a considerably poor prognostic condition so overnight miracles should not be expected.A recovery of frozen shoulder is slow and takes 3-5 months to be fully fit.
During this time symptomatic treatment should be carried out through electrotherapy and ROM exercises /mobilization technique.to make the patients lifestyle as optimum as possible.
Do write to me in detail regarding your fathers condition in detail also x rays and calcium levels are to be rechecked.
Frozen shoulder requires patience since recovery takes around 6 months to a year.patient needs to learn specific frozen shoulder exercises from therapist do it twice daily.get shoulder mobilized from therapist till range improves.for pain relief he can go for swd machine and hot fomentation both.avoid sleeping on the painful side.:-)