This is a very common condition , nothing to be worried about As such saccralisation won’t affect in future

This treatment has been  suggested on bases of the information provided. However I would like to examine & investigate your husband in detail. -Control  Hypertension, Diabetes or  metabolic disorder, if there is any.  - Sleep on a hard bed with soft bedding. - Keep no pillow under the head. - Avoid painful acts & activities. - Fomentation with warm water. -Let the part not be exposed cold. -Do mild exercises for the affected part.- back and lower limbs  -Any way it may be tried, --. Ugesic (Piroxicam) 20mg 1tab once  a day x 5days  --. Caldikind plus  (Mankind) 1tab Once  a day x 10 days. Kindly make sure, there is no allergy to any of these medicines. --For emergency treatment visit nearest hospital. -For exercises you may visit my YouTube channel- Dr. N C gupta. -Wish your husband  a quick recovery & good health  kindly like & subscribe to the channel to get notification for subsequent videos of your intrest. it is free.  Dr N C Gupta MS (ortho) DMC 3624

Just improve and maintain Back muscle strength as well as flexibility.. Otherwise he may get Disc problems and sciatica...

It’s normal variance

Nothing serious

Not needed. Ignore that sacralization.