A good back program usually involves three essential pulls.
1- Pull from the ground (deadlift)
2- Pull from infront (rows)
3- Pull from above (pullups)
0 degrees, 90 degrees, 180 degrees. Lower back, middle back, upper back. All hit with this simple balance.
If necessary in later stages of training, face pulls/hyper-extensions/power cleans are all beneficial for the extra stimulus.
As mentioned by an earlier poster, you will need to specify what type of back problems exactly that guy man has. A Doctor could only prescribe treatment for his back and a physical therapist recovery.
Personal Trainer- ACE, NASM AFPA; Nutrition Consultant- AFPA
"I can do all things through Christ which strengtheneth me." - Philippians 4:13"