The phrase "a difficult back" is correct and usable in written English.
It can be used in contexts discussing physical challenges, such as injuries or conditions affecting the back, or metaphorically to describe a challenging situation.
Example: "After lifting heavy boxes all day, I realized I had developed a difficult back that needed some rest."
Alternatives: "a troublesome back" or "a challenging back".
After five rounds of nip and tuck jousting for third, the pair executed a difficult back three-and-a-half somersault pike to claim bronze with a score of 89.64, well clear of the 83.62 they needed.
According to Moynihan, Bradley's hands-on approach to the details of his campaign helped doom the effort....Moynihan has only recently recuperated from a difficult back operation, and the suspenders on his tweed pants were hanging loosely over his tall, spindly frame.
Nicks's first catch, for 22 yards, was the kind of play he had not been making for most of this season — a difficult, back-shoulder reception as he wrested the ball from a defender.
"I knew it was just going to be a difficult road back," Ali said.
"We don't have to bat a difficult interview back and forth all day, do we?" So we move on.
The latest incident in Ben Barba's chequered NRL career has left the fullback without a playing contract, undergoing intensive rehabilitation in an overseas facility and facing a difficult road back to professional rugby league fields in Australia.
He hit two perfect shots on the 18th hole in the final round, and the second one bounced just a little too hard and ran through the green, leaving him a difficult chip back, which he was unable to get up and down.
Shakiba says that getting Polaroid's blessing to create this app was a difficult process back in the day.
An exit from the euro could lead to financial chaos, a difficult transition back to the drachma, and further government austerity.
Richardson's men, unprepared for the snow, made a difficult trek back to the lowlands.
A participant (60 years old, HIV-positive for 20 years) shared her painful experience of a double disclosure when she broke the news to her son that they were both HIV-positive: " It was a difficult trip back, you know.
