Buchholz left Thursday's game with lower back stiffness, reports Sean McAdam of CSNNE.com.
Spin:
Buchholz was able to throw 81 pitches over five innings before being removed. He struck out five and gave up just two hits and one run. His back has been bothering him for a while now, so the Red Sox may consider putting him on the disabled list, otherwise it may continue to linger.